Answer:
PCBs are very stable molecules
Explanation:
PCBs are approximately 209 compounds made of chlorine. PCBs are formed synthetically.These compounds have high chemical and thermal stability so their chemical and biological physical degradation is very slow.
The years that these compounds can last are 2 weeks to 2 years in water, 6 years in the soil, and more than 10 years in fish.
PCBs are still found in the environment because they are extremely stable molecules that do not degrade easily and can bioaccumulate in organisms and soils.
Production of PCBs (polychlorinated biphenyls) was discontinued in 1977, yet they are still found in the environment chiefly because PCBs are very stable molecules. These man-made organic compounds, consisting of carbon, hydrogen, and chlorine atoms, were used in a wide range of industrial and commercial applications due to their non-flammability, chemical stability, high boiling point, and electrical insulating properties. Despite their ban, PCBs persist in the environment because they do not easily break down and can both bioaccumulate in wildlife and be found in soils and sediments, even long after production has ceased.
PCBs' chemical stability means that instead of reacting and breaking down, they remain intact and accumulate over time. This is why higher concentrations can be found in predatory fish, and why they have been observed in remote regions like the Arctic, where they condense onto the soil from the atmosphere. Health effects associated with PCB exposure are numerous and can include complications in physical and neurological development, potential carcinogenesis, and effects on immune, reproductive, nervous, and endocrine systems.
In a one-to-many binary relationship, the primary key from the "many side" of the relationship is inserted as a foreign key in the "one side" of the relationship. a) trueb) false
In a one-to-many binary relationship, the primary key from the "many side" of the relationship is inserted as a foreign key in the "one side" of the relationship. It is a false statement.
Explanation:
Two entities participate in a binary relationship. Two relations together represent a one-to-many binary relationship. In this case the first key of the relation on one side of the relationship is inserted as a foreign key into the relation on many side of the relationship.
In one-to-many relationship, a record in a specific table can be co-related with one or more records in different table.
The foreign key can be used to store one-to-one binary relationship in the social database.
What action must a Marine take to accomplish the task of enabling themselves and their Marines to assume progressively greater responsibilities in the Marine Corps and society?
Marines must go through a process of resocialization to assume greater responsibilities in the Marine Corps and society.
Explanation:The action that a Marine must take to enable themselves and their Marines to assume progressively greater responsibilities in the Marine Corps and society is to go through a process of resocialization. This process involves learning discipline, a capacity for hard work, and setting aside personal goals for the greater good.
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To enable Marines to assume greater responsibilities, leaders must prioritize continuous learning, mentorship, challenging assignments, and instilling core values like honor and commitment.
To enable themselves and their Marines to assume progressively greater responsibilities in the Marine Corps and society, a Marine must prioritize several actions. Firstly, they should cultivate a culture of continuous learning and personal development within their unit, encouraging Marines to seek out opportunities for growth and education. This includes promoting formal education programs, professional military education, and civilian education options.
Additionally, effective mentorship is crucial. Marines should actively mentor and be mentored, passing on knowledge, skills, and leadership experience. By fostering a supportive environment where junior Marines feel empowered to voice their ideas and concerns, leaders can help them develop confidence and critical thinking skills necessary for assuming greater responsibilities.
Furthermore, leaders must provide challenging assignments and opportunities for leadership roles, allowing Marines to demonstrate their capabilities and hone their leadership skills. Encouraging a mindset of accountability and ownership of tasks fosters initiative and prepares Marines for higher-level responsibilities.
Lastly, emphasizing the Marine Corps' core values of honor, courage, and commitment instills a sense of duty and responsibility, both within the Corps and in society at large, preparing Marines to excel in leadership roles on and off the battlefield.
Benoit is interested in studying the effects of various biological forces on human development. Which topic is probably of LEAST interest to Benoit?
Answer:
COGNITION
Explanation:
The four basic forces of development are biological, psychological, sociocultural, and life-cycle.
Cognition is a topic under psychological force of development. Since Benoit is interested in studying the effects of various biological forces on human development, COGNITION will probably be of LEAST interest to Benoit.
Cognitive biology says that every organism—be it a single cell or multicellular—is continuously involved in systematic process of cognition combined with intentional behaviors. It as to do with an organism ability to sense stimuli in its environment and act in response to it, it is cognitive.
The ABO and MN blood-type frequencies of the Dunkers differ significantly from those of current American and German populations due to:________ a) gene flow. b) mutation. c) natural selection. d) genetic drift.
Answer:
d) genetic drift
Explanation:
The ABO and MN blood-type frequencies of the Dunkers differ significantly from those of current American and German populations due to Genetic Drift. This term refers to variation in the relative frequency of the different genotypes that may exist within a small population, which results in the extinction of different genes as individuals die without reproducing.
How do prions disrupt the normal function of an organism and cause diseases such as mad cow disease?
Answer:
Prions causes abnormal folding of the prion proteins in the brain.
Explanation:
Prions are the abnormal infectious agents composed only of the proteins and no nucleic acids. The prions cause several neurodegenerative diseases in the humans as well as the mammals.
The prions cause the cow mad disease in the cows by affecting the brain of the cow as the prions act on the prion proteins present in the brain only and change their conformation. This leads to the degeneration of the neurons and causes tiny pores in the brain giving sponge-like appearance.
This slows down the mental activity and thus ultimately leads to the death of the cow.
A 7-year-old boy presents complaining of occasional intermittent lower abdominal pain over the last several weeks associated with a decline in the frequency of bowel movements to one every third day. When he does defecate, stools are hard to pass and sometimes painful. There is no blood in the stools. He has no chronic medical problems, has never had surgery, and takes no medications. Review of systems are negative and physical exam is normal. What is the most appropriate initial intervention for this child?
Answer:
Polyethylene glycol.
Explanation:
The abdominal pain might occur in the area of the pelvic regions and the chest area. The lower abdominal pain is common in children that might occur due to the constipation.
The increase or the presence of the polyethylene glycol in the abdomen can cause pain. This affects the bowel movements, bloating, vomiting, diarrhea and in excess condition may also cause the rectal bleeding in the children as well as in adult.
Thus, the answer is polyethylene glycol.
A client visits an orthopedic specialist because of pain beginning in the low back and radiating behind the right thigh and down below the right knee. The doctor suspects a diagnosis of sciatica. The nurse knows that the origin of the pain is between which intervertebral disks?
ANSWER: The origin of the pain is from the intervertebral disks of the lumbosacral spine.
EXPLANATION:
Sciatica is pain in the lower extremity resulting from irritation of the sciatic nerve.
The sciatic nerve is the largest nerve in the body and begins from nerve roots in the lumbar spinal cord in the low back and extends through the buttock area to send nerve endings down the lower limb.
Sciatica is caused by irritation of the root(s) of the lower lumbar and lumbosacral spine. Additional common causes of sciatica include: Lumbar spinal stenosis (narrowing of the spinal canal in the lower back) Degenerative disc disease (breakdown of discs, which act as cushions between the vertebrae).
Answer:
L4, L5, and S1
Explanation:
The lower lumbar disks, L4–L5 and L5–S1, are subject to the greatest mechanical stress and the greatest degenerative changes. Disk protrusion (herniated nucleus pulposus) or facet joint changes can cause pressure on nerve roots as they leave the spinal canal, which results in pain that radiates along the nerve.
Mark is participating in one of Posner's attention experiments. As he looks at the fixation point, an arrow pointing to the right appears. Then the stimulus appears in the left target area. The cue in this trial would be considered. A Valid B. InvalidC. Simple D.Symbolic of. E. Both simple and valid F. Both symbolic and invalid
Answer:
Mark is participating in one of Posner's attention experiments. As he looks at the fixation point, an arrow pointing to the right appears. Then the stimulus appears in the left target area. The cue in this trial would be considered "Both symbolic and invalid"
Explanation:
Posner' s attention test is a psychological test which is being conducted in order to check the attention and attention deficit of the person. The spatial orientation happens when the attention of the person is drawn towards a specific location, the attention is drawn because of the stimulus generation. Drawing attention is known as the cueing. The theory of attention is generally made on the basis of the target detection, visual orientation and also on alertness. sometimes it is believed that auditory stimulus is also included in it.
a biologist thinks that over time a parasite can influence the evolution of its host species. do you think she is right? justify your answer.
Answer:
She's right
Explanation:
A parasite is an organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other's expense.
A parasite depends on its host for survival and rarely kills its host. Parasites are usually smaller than its host.
However, over time, parasites can influence the evolution of its host species as a consequence of its effect on the hosts' nutrition.
Certain hosts may depend on that particular nutrition for a number of functions which may include reproductive, behavioral, social and its overall health. When there is an alteration in any of these functions, for example, reproductive function, the host is affected. Over time an evolutionary change have to occur to protect the hosts' species.
Some parasites tend to reduce the overall health of the hosts which in turn tend to make their hosts prey to predators. For example, infected antelopes might not be fast enough to evade lions, or infected lions might not be fast enough to catch antelopes. Depending on the frequency of the infection, overtime, an evolutionary change would happen.
Final answer:
Yes, a parasite can influence the evolution of its host species through co-evolutionary arms races, where both must continually adapt to survive. This dynamic results in changes in genetic diversity and selective pressures on both the parasite and the host.
Explanation:
The Red Queen Hypothesis aptly captures the concept that species must continually adapt to survive in the face of evolving threats, such as parasites. Biologists assert that parasites can indeed influence the evolution of their host species. As hosts evolve to resist parasitic infections, parasites must similarly evolve to overcome their hosts' defenses, leading to co-evolutionary arms races where neither species can afford to stop progressing without facing possible extinction. The evolution of parasites and their interactions with hosts create varying selection pressures, necessitating continual adaptation within host species in order to maintain a balance in survival and reproduction; hence supporting the Red Queen's idea, "It takes all the running you can do to stay in the same place."
Empirical studies have attempted to understand how these dynamics play out in real-world scenarios, often examining the genetic diversity in host and parasite populations. While some research highlights instances where host-parasite interactions have led to reductions in genetic diversity, other studies find that these same interactions necessitate and drive genetic variations within species. This underlines the importance of genetic diversity as a survival strategy, confirming the notion that a parasite can certainly impact the evolutionary course of its host.
Before the evolution of complex nervous systems, animals with very simple nervous systems, such as the nerve nets of cnidarians, could engage in all of the behaviors except __________
Answer:
FINDING A MATE
Explanation:Cndarians are about 11000 species of animals found living in water( they are aquatic animals). The body of Cnidarians are divided into two (2) layers called EXODERM AND ENDODERM separated by MESOGLEA( a jelly-like material, Cndarians have tentacles which they can use to Sting Invaders or predators. Cnidarians are known to have Nerve nets which help them to transfer stimuli or certain nutrients but are never used to search for mates.
NEED HELP ASAP I DONT HAVE MUCH TIME
How are the sun, Earth, and the moon aligned during a solar eclipse?
In a straight line with the moon between Earth and the sun
In a straight line with Earth between the sun and the moon
With the sun and the moon at right angles to each other in relation to Earth
With the sun and Earth at right angles to each other in relation to the moon
Answer:
i believe it is the strait line moon between the earth and the sun
Explanation:
this is because a solar eclipse is when the moon blocks out the sun.
hope this helped
Answer:
A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.
Explanation:
So basically In a straight line with the moon between Earth and the sun
Which of the following is NOT an exotic species that has caused unforeseen ecological disruption where it has been introduced, whether accidentally or deliberately?
Answer:
All of the above have caused ecological disruption
Explanation:
Ecological disruption can be described as a kind of disturbance, whether of biological or non-biological origin which affects the pattern of a particular ecosystem. Disruptions might be caused due to factors such as weather changes or biotic factors such as the invasion of a predator species which disrupts the whole food web of an ecosystem. Any new species, when introduced in a stable ecosystem, will cause disruption in some way or the other.
In a nursing class the instructor explains the vulnerability of the organ systems during formation, such as the respiratory and circulatory systems, to environmental influences. This process of organ formation is called ________
Answer:
organogenesis
Explanation:
Organogenesis is defined as a process in which the three germ layers differentiate further to form several organs.
The embryonic stem cell is responsible for determining the ultimate cell type. During this process, neural system is formed and several morphological changes occur. The neural system further differentiates and develops to form neural tube and ultimately converts into brain and spinal cord. While folds and dense clusters are formed in the embryo that later form organs.
Phrenologists believed that the contour of the skull could provide valuable information about a person’s brain structure and function. This was built on the assumption(s) that____________.
The question is incomplete as it does not have the options which are:
a. skull protrusions are caused by disproportionate development of the brain areas beneath them, which are responsible for different specific functions.
b. certain traits such as aggressiveness lead to life experiences and injuries that alter the shape of the skull in specific ways.
c. life experiences and injuries that alter the shape of the skull in specific ways lead to certain traits, such as aggressiveness.
d. the development of the skull bones directly influences the configuration of the soft brain areas beneath them, which are responsible for different specific functions.
Answer:
Option-A
Explanation:
Phenology refers to the study of the structure of the skull and relating it to determine the character of a person and the mental capacity.
The practice of phrenology is pseudoscience as it does not provide any scientific pieces of evidence.
There are many assumptions made in this pseudoscience like the mind is composed of multiple faculties which form organ and the development of these organs determine the shape of the skull therefore by studying the shape of the skull can help determine the psychological aptitude and character.
Thus, Option-A is the correct answer.
Phrenologists believed that the contour of the skull reflected a person's brain structure and function, but this assumption has been proven wrong. Despite being a pseudoscience, phrenology has influenced current-day neuroscience in terms of understanding the specific functions of different parts of the brain.
Explanation:Phrenologists believed that the contour of the skull could provide valuable information about a person’s brain structure and function. They assumed that bumps and indentations on the skull were correlated with specific functions of the brain. For example, they believed that the size and location of ridges on the head could indicate a person's artistic or spatial reasoning abilities. However, this assumption has been proven wrong and phrenology is now considered a pseudoscience. Despite its lack of scientific validity, phrenology has had a significant impact on current-day neuroscience, influencing the understanding of the specific functions of different parts of the brain that can be identified through scientific inquiry.
A slice of pizza has 500 kcal. If we could burn the pizza anduse all the heat to warm a 50-L container of cold water, what wouldbe the approximate increase in the temperature of the water?(Note: A liter of cold water weighs about 1 kg.)
a. 50°C
b. 5°C
c. 10°C
d. 100°C
e. 1°C
Answer:
c. 10°C
Explanation:
Given that: A slice of pizza has 500 kcal.
That is to say Q = 500kcal
If the pizza was burned and all the heat were used to warm a 50-L container of cold water,
what would be the approximate increase in the temperature of the water?
We were also being told to note that; A liter of cold water weighs about 1 kg.
i.e 50-L container weighs about 50kg (mass)
∴ Since;
Q= 500kcal,
m = 50kg; &
the specific heact (c) = 1
we can find the approximate increase in the temperature of the water by using the formula:
Q = mcΔT
ΔT = [tex]\frac{Q}{mc}[/tex]
ΔT = [tex]\frac{500}{50*1}[/tex]
ΔT = 10°C
In the context of psychosomatic medicine, Flanders Dunbar and Franz Alexander maintained that conflicts produce anxiety, which becomes unconscious and takes a physiological toll on the body via the?
Answer:
Autonomic nervous system.
Explanation:
The human psychology involves the study of the emotions, anger and feelings of the humans with themselves and other people of the society. The emotions are controlled by the external as well as internal factors.
The peripheral nervous system of the body constitutes the autonomic nervous system. This system is activated during the stress and anxiety response. The autonomic nervous system prepares the body for the fight and flight mechanism.
Thus, the answer is autonomic nervous system.
A physiology instructor asks the students about the purpose of the promoter region on a DNA strand. Which student response is most accurate?
Answer:
Contains amino acids that the RNA polymerase recognized and binds to, thus starting the replication process.
Explanation:
The promoter region of a DNA is where initiation of transcription of a gene takes place.
This happens when RNA polymerases and other vital transcriptional factors bind to the promoter sequence and initiate transcription. Promoters are typically located up stream (5' end) of the transcription initiation site and the promoter sequences define direction of transcription.
The TATA box is the conserved Promoter sequence in most eukaryotes.
While Captain Montagne is flying the airplane full of passengers from New York to Houston, she engages the autopilot so that the plane will fly itself automatically for a while. Which part of your nervous system is similar to the autopilot of the airplane?
Answer:
"Autonomic nervous system" is similar to the autopilot of the airplane
Explanation:
The autonomic nervous system is a portion of the govern system which regulates the metabolic or the physiological processes of the human being. Inside the brain the autonomic nervous system is controlled by the hypothalamus. On the other hand the autopilot of the airplane is the combination of the system that are required for the automatic operation of the plane. Hence, both the things are similar but works for different process.
Margination refers to Margination refers to dilation of blood vessels. the movement of phagocytes through walls of blood vessels. the chemotactic response of phagocytes. adherence of phagocytes to the lining of blood vessels.
Answer:
The correct answer is- adherence of phagocytes to the lining of blood vessels.
Explanation:
The proper functioning of phagocytes or white blood cells is not possible without the adherence ability of these cells to the vascular epithelium. So to facilitate the adhesion the phagocytes migrate towards the site through blood.
Margination is the adherence and accumulation of phagocytes on the blood vessel lining present at the injury site. It is a part of inflammatory response. The margination depends on various conditions like flow rate, red blood cell aggregation, local hematocrit, etc. Therefore the correct answer is-adherence of phagocytes to the lining of blood vessels.
Answer:
Adherence of phagocytes to the lining of blood vessels.
Explanation:
Margination is the process of the movement of the selected particles across the walls of the particular channels. The particles can easilu undergo margination in blood.
The margination is useful for the clearance of the blood from the pathogens and separation of the effected cells. The margination is also performed by the immune cells especially macrophages for for the phagocytic activity and adherence with the blood vessels lining.
Thus, the correct answer is option (4).
Liver cells are exposed to radioactive amino acids; all proteins synthesized during this time are radioactive. The cells are then re moved at 5-minute intervals and fractionated. Where in the cells is the radioactively labeled enzyme lipase performing its intracellular functions?
A. In lysosomes
B. On ribosomes
C. In the cytoskeleton
D. In the endoplasmic reticulum
E. In the Golgi I know that the answer is in the ER, but why wouldn't it be in the ribosomes if that is where proteins are synthesized.
Answer: The Radioactively labeled enzyme, lipase performs its function in the endoplasmic reticulum
Explanation:
Lipase is found in the Endoplasmic reticulum (ER), because
- it helps in the breakdown of lipids into fatty acids, and the ER is an organelle of liver cell, known to aid the intracellular transport of materials within the cytoplasm.
Therefore, since lipid stored or transported into liver will be distributed by ER, the radioactive Lipase is usually present to breakdown the lipids for easy transport and usage by other cell organelles.
Answer: in the endoplasmic reticulum
Explanation:
Life-span ______ is the pattern of movement or change that begins at conception and continues through the human life span.
Answer:
Life span development
Explanation:
Life span development is usually defined as the entire process of changes or development that occurs within the body of humans right from birth till death. These changes that occur can be physiological, perceptive, social as well as emotional changes, and it commonly occurs in different phases of an individual's life.
The main stages of this development include infant stage, adolescent stage, death stage.
Some of the common factors that affect this development include heredity, nutrition, sex, and hormones.
Life-span development is the pattern of movement or change that begins at conception and continues through the human life span. The changes that take place from birth to death in the physical, cognitive, emotional, and social spheres are included.
Infancy, childhood, adolescence, maturity, and old age are just a few of the periods of life that this area of research looks at in terms of how people develop, learn, and adapt.
The elements that affect human growth throughout time—both biological and environmental—are taken into account during lifespan development.
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A young boy is staring at the tropical fish tank in his mother's office. He reaches in and pulls out a fern-like plant. When he closely examines this plant, he notices it has very large cells with several dark spots. What is likely true of this plant?a. This is likely an example of a simple multicellular fungi.
b. It is coenocytic―the dark spots in the cells are actually nuclei.
c. Given the tropical environment, this plant is likely an example of Caulerpa.
d. Given the tropical environment, this plant is likely an example of Codium.
e. This plant is coenocytic (the dark spots are actually nuclei) and―given the tropical environment―is likely an example of Caulerpa.
Answer:
This is an example of " This plant is coenocytic (the dark spots are actually nuclei) and―given the tropical environment―is likely an example of Caulerpa"
Explanation:
Here, the plant is referred as the coenocyte because of the presence of multinucleate cells, which occurs due to the multiple nuclear division without undergoing cytokinensis. This happens because of the cellular accumulation after the disintegration of the cell membranes present beneath the mass. On the other hand, caulerpa is the phenomenon in which lot of nuclei are present inside one cell. This makes the biggest single cell of the world.
What kind of speciation has occurred in this example, and what has driven it? Beetle pollinators of a particular plant are attracted to its flowers bright orange color. The beetles not only pollinate the flowers, but they mate while inside of the flowers. A mutant version of the plant with red flowers becomes more common with the passage of time. A particular variant of the beetle prefers the red flowers to the orange flowers. Over time, these two beetle variants diverge from each other to such an extent that interbreeding is no longer possible.
A. Allopatric speciation, ecological isolation
B. Sympatric speciation, habitat differentiation
C. Allopatric speciation, behavioral isolation
D. Sympatric speciation, sexual selection
E. Sympatric speciation, allopolyploidy
Answer:
B. Sympatric speciation, habitat differentiation
Explanation:
In the given example, no geographical barrier has been operational to isolate the two populations of the beetles so as to prevent interbreeding between them. On the other hand, the two variants are present together while developing isolating reproductively from each other. Therefore, it represents sympatric speciation.
The two variants mate inside the flowers of different colors. Since their mating sites are different colored flowers, they are not able to interbreed. This represents habitat differentiation as the one variants of beetle reproduce inside orange the colored flowers while the other inside the red-colored flowers. They develop a tendency to reproduce inside the different habitats (a habitat is a region where an organism lives and reproduces).
The carrying capacity of a wildlife reserve is 570 individuals for a particular species of rodents. If the area of the reserve is extended,
the carrying capacity is likely to
. During the summer, a fatal disease began killing individuals. The carrying
capacity of the reserve will therefore
Answer:
The carrying capacity of a wildlife reserve is 570 individuals for a particular species of rodents. If the area of the reserve is extended, the carrying capacity is likely to Increase
During the summer, a fatal disease began killing individuals. The carrying
capacity of the reserve will therefore decrease
Explanation:
The carrying capacity of a habitat is the maximum number of individuals of a given species it can support without depleting the available resources. When the area of the reserve is extended, the carrying capacity increases because the available resources will also increase. A fatal disease would increase the carrying capacity since the number of wildlife would decrease.
Carrying capacity -K- is the capability of the environmnet to support a growing population. A) Increase. B) Decrease.
What is carrying capacity?Carrying capacity, K, refers to the maximum point at which the environment can support a growing population.
K is a constant. It coincides with the population size when natality rate and mortality rate are equal to each other. This is the equilibrium point.
Commonly environments have limited resources and space, and as the population grows, competition and other interactions increases too.
The per capita growth rate decreases as population size increases. Finally, the population reaches the maximum point of carrying capacity, delimited by available resources, such as food or space and other factors. When the population size exceeds K, carrying capacity, the population decreases in size.
The carrying capacity might be affected by limiting factors, which might be a result of the population density (for example, competition) or might be density-independent. This last case refers to dense-independent factors, and among these, we can mention human impact or natural disasters (fires, volcanic eruptions, flooding).
In the exposed example,
A) If the area of the reserve is extended, the carrying capacity is likely to increase. This is because the bigger the area is, the more available resources there are, so populations can keep growing in size.B) If a fatal disease began killing individuals, the carrying capacity of the reserve will therefore decrease. There is a factor -disease- that is making the population decrease in size.You can learn more about carrying capacity at
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Gametes are _______ so that when fertilization occurs, the resulting zygote will have the characteristic number of chromosomes for that species.
Answer:
Haploid
Explanation:
Gametes are mainly produced by the process of meiosis in the gamete mother cells. Meiosis reduces the chromosome number to the half in the gametes and produces haploid gametes. Haploid cells are the ones that have only one complete set of chromosomes. The fusion of haploid male gamete with a haploid female gamete restores the diploid chromosome number in the zygote.
For example, each of the human sperms and egg cells has 23 chromosomes. Somatic cells in humans have 46 chromosomes. The fusion of a sperm carrying 23 chromosomes with an egg having 23 chromosomes restores the 46 chromosomes in the zygote.
In circumstances where the body requires prolonged or increased levels of a hormone, the DNA of target cells will specify the synthesis of more receptors on the surface of the cells of the target organ. This is known as ________.
Answer:
Up-regulation.
Explanation:
Hormones may be defined as the chemical messengers of the body that can transmit information and maintains homeostasis. The hormones can directly go into the bloodstream and may release through the special ducts.
The receptors of the hormone is required for the binding of the receptors. To maintain the normal homeostasis of the body, the body shows the up regulation and down regulation. In up regulation the hormone levels increases in the body by increasing the receptor on the specific target organ.
Thus, the correct answer is up regulation.
Which of the following is not a result of hydrogen bonds?
A. Two hydrogen atoms join together to form a molecule of hydrogen gas.
B. An enzyme has a unique shape that allows it to bond only with specific molecules.
C. Two strands of DNA are linked together taking a shape similar to a ladder.
D.Some hair is straight, some wavy, and some very curly.
Answer:
Answer is A. Two hydrogen atoms join together to form a molecule of hydrogen gas.
Explanation:
The electromagnetic attraction existing between hydrogen and other electronegative atom, such as nitrogen or oxygen, is known as hydrogen bond. It can also be explained as the electromagnetic attraction occurring when hydrogen binds to a higher or larger atom such as nitrogen.
Note that , the bond existing between two hydrogen atoms resulting in the formation of a molecule of hydrogen gas is covalent bond. Covalent bond can simply be explained as the sharing of electrons.
The study of chemicals and bonds is called chemistry.
The correct answer is A which is Two hydrogen atoms joining together to form a molecule of hydrogen gas.
What is a hydrogen bond?The bond formed between the hydrogen is called a hydrogen bond.The electromagnetic attraction existing between hydrogen and another electronegative atom, such as nitrogen or oxygen, is known as a hydrogen bond. It can also be explained as the electromagnetic attraction occurring when hydrogen bonds to a higher or larger atom such as nitrogen.
Note that, the bond existing between two hydrogen atoms resulting in the formation of a molecule of hydrogen gas is a covalent bond.
A covalent bond can simply be explained as the sharing of electrons.
Hence, the answer is mentioned as described.
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What is apoptosis? A. The proliferation of cytotoxic T-cells. B. The receptor on a cytotoxic T-cell that recognizes MHC molecules. C. The process of programmed cell death. D. A protein molecule that forms a pore in the membranes of infected cells.
Answer:
Option-C
Explanation:
Apoptosis is a genetically controlled process taking place in the multicellular organisms which is marked with the self-destruction called or programmed cell death.
During apoptosis various physiological and morphological changes take place in the cell such as fragmentation of nuclear DNA, nucleus, shrinkage of cell and mRNA decay.
Since apoptotic cell undergoes cell death which is genetically controlled or programmed by the genes, therefore, apoptosis is known as the programmed cell death.
Thus, Option-C is the correct answer.
According to the Lab Safety Sheet provided for this week, which of the following is a potential hazard you will face in the b-galactosidase assay lab? (Check all that apply)Select one or more:
a. Water reactive chemicals
b. Corrosive chemicals
c. Chemicals causing respiratory tract, eye and skin irritation
d. Potentially carcinogenic chemicals
e. Radioactive materials
Answer:
Chemicals causing respiratory tract, eye and skin irritation.
Potential Carcinogenic chemicals
Explanation:
b-galactosidase is an enzyme encoded by Lac Z gene of the lac operon in E. coli. It hydrolyses b-galactosides and lactose into monosaccharides which are simple sugars
In order to carry out this assay, materials including b-mercaptoethanol and ONPG(o-nitrophenyl-b-d-galactopyranoside) are used.
b-Mercaptoethanol produces vapors which can cause respiratory tract irritation if inhaled and ONPG is a potential carcinogenic chemical.
In the b-galactosidase assay lab, potential hazards include corrosive chemicals, chemicals causing respiratory tract, eye and skin irritation, and potentially carcinogenic chemicals.
Explanation:In the b-galactosidase assay lab, potential hazards you may face include:
Corrosive chemicals: These can burn your skin and eyes, causing harm.Chemicals causing respiratory tract, eye and skin irritation: Some chemicals used in the lab can cause irritation to your respiratory tract, eyes, and skin.Potentially carcinogenic chemicals: There may be chemicals in the lab that have the potential to cause cancer.The practitioner is examining a client and notes that he has small, punctate skin hemorrhages on his abdomen and chest. This finding is suggestive of which of the following lab results?
-Low platelets
-Low red blood cells
-Low white blood cells
-Low neutrophils
Answer:
Answer is low platelets.
Explanation:
Platelets are one of the components of the blood. And it helps to prevent losing too much of blood during injury ,by forming a clot on the injury.
Ii should be noted that low platelets in the body can result to punctuate skin hemorrhages .Bleeding from the nose or vaginal can also be linked to low amount of platelets in the body.