Answer: Identities
Explanation:
When studying about the explosives, cigarettes and drugs then they tend to trace the identities and lives of the people.
The finger prints of the criminals can tell us different things about their lifestyles. They can give us an idea that whether they already have a previous criminal record or not.
Touching anything that can leave a finger print on it which can be used used to reveal the identity of the person.
Final answer:
Dr. Sue Jickells's research into trace substances on criminals' skin can reveal more than just their unique fingerprint patterns. Forensic geneticists use DNA fingerprinting to match tiny amounts of tissue found at crime scenes to suspects' DNA. This technology has broad applications in both forensic science and other fields of study.
Explanation:
Dr. Sue Jickells's research aims at understanding how trace substances left by criminals on surfaces they come into contact with can provide in-depth information about the individuals, beyond just their fingerprint patterns. Fingerprints are unique to every individual, with their general characteristics being genetically determined yet forming uniquely during development, even in identical twins. Traces of substances like explosives, cigarettes, and drugs can be analyzed to gain insights into the activities and habits of a person leaving a fingerprint, implying a potential connection to a crime.
Forensic geneticists can match traces of human tissue found at crime scenes to a specific person's DNA. Even small amounts of tissue can be used for DNA evidence, which is then amplified using PCR and compared to DNA databases such as CODIS to find matches. This process, known as DNA fingerprinting, is pivotal in forensic science for identifying suspects and has applications ranging from paternity testing to wildlife studies and food provenance.
The number of major histocompatibility (MHC) protein combinations possible in a given population is enormous. However, an individual in that diverse population has a far more limited array of MHC molecules because ________.
Answer:
The correct answer is "each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene".
Explanation:
In normal conditions, an individual has only two different alleles for a given gene: one inherited from his mother and the other from his father. However, this does not mean that among humans, there are only two different alleles for each gene. The major histocompatibility (MHC) genes are a clear example of this, since there are multiple combinations for each MHC class. For instance, there are 40 very similar alleles only for the HLA-B27 subtype.
Final answer:
An individual has a limited array of MHC molecules because they can inherit only two alleles at each MHC gene locus, one from each parent, despite the population having many alleles due to the high polymorphism of these genes.
Explanation:
The number of major histocompatibility (MHC) protein combinations possible in a given population is enormous. However, an individual in that diverse population has a far more limited array of MHC molecules because an individual can inherit a maximum of two alleles at each locus from their parents. The genes for MHC are highly polymorphic, with many possible alleles at each locus, but since only two alleles (one from each parent) can be present at each locus in an individual, the individual's MHC diversity is much less than that of the population.
The MHC genes are the most polymorphic genes in the human genome and are co-dominantly expressed, meaning the alleles inherited from each parent are both expressed. Nonetheless, despite the large number of potential combinations, a person's MHC genetic makeup is limited by the number of genes (loci) and the two alleles per locus they possess.
These MHC genes play a critical role in the immune system by presenting peptide fragments of pathogens to T-cells, and compatibility of these genes is crucial for successful organ transplantation. This is why finding a match for transplantation can be challenging and often a family genetic match is sought.
What is a site for a muscle or ligament attachment?
Question 2
Camouflage and mimicry are examples of ____
a. competition.
b. perfection.
c. mutation.
d. adaptation.
When an E. coli cell is infected by multiple phages, what route of infection (lytic or lysogenic) will the phages take? Why?
Answer:
When an E.coli cell is infected by multiple phages,they will take either lytic or lysogenic pathway.
Explanation:
When lambda phage bacteriophage infects an E.coli,it can either undergo lytic cell growth and lyse the host cell or enter lysogenic pathway.
The operator region of lac operon in E.coli contain single repressor binding site whereas the lambda operators [tex]O_{L}[/tex] and [tex]O_{R}[/tex] each contains 3 repressor binding sites ([tex]O_{L_1} , O_{L_2},O_{L_3}[/tex] and [tex]O_{R_1},O_{R_2},O_{R_3}[/tex]) that are differently occupied under different conditions.
The differential affinity of lambda repressor for the three binding sites in these operators play an important role in the maintenance of lysogenic state of lambda prophage in E.coli.
The lytic development occurs in cells infected with lambda phage that carry [tex]C_1[/tex] gene.
In contrast,lysogeny will occur in bacteria that infected with lambda phage that harbor a deletion of Cro gene.
Ectoprocts and brachiopods are collectively referred to as __________.
Answer:
Ectoprocts and brachiopods are collectively referred to as lophophorates.
Explanation:
Answer:
lophophorates
Explanation:
Ectoprocts and brachiopods are collectively referred to as lophophorates
Rocio and Thomas have three sons. Rocio is pregnant with another son. Research on the older-brother effect indicates that the chances of the fourth son being homosexual is ________ percent.
Explanation:
The term Homosexuality was given by a German psychologist, Karoly Maria Benkert in 19th Century.Homosexual are the person who are sexually attracted to people of their own sex. Lesbian is the term used for females and Gay is the term used for males who are homosexual.An individual's sexual orientation is difficult for the scientist to determine. It can be due to the factors such as environmental, hormonal etc.
Metabolism using an electron transport system is classified based on the nature of the initial electron donors and terminal electron acceptors. Lithotrophy uses __________ molecules as the __________ electron __________. Choose one: A. organic; initial; donors B. inorganic; final; acceptors C. organic; final; acceptors D. inorganic; initial; donors
Answer: C organic; final; accpetors
Some nematode worms suck plant juices from the roots of plants and are economically important agricultural pests. Some fungi are usually decomposers of plant material, but some trap and kill nematodes at times. Arthrobotrys traps and kills nematodes, especially when they lack nitrogen sources. These two facts suggest that farmers could find Arthrobotrys an important tool in combating nematode infestations. Which of the following research questions would make a good starting point for developing such a defense against plant-sucking nematodes?A. What mechanisms do nematodes have that could allow them to escape from Arthrobotrys?B. Does nitrogen fertilization of crops affect the likelihood that ArthrobotrysC. What is the evolutionarily oldest method of trapping nematodes?D. Do nitrogen-fixing bacteria provide nitrogen to the fungi?
Answer:
A. What mechanisms do nematodes have that could allow them to escape from Arthrobotrys?
Explanation:
Since the research question has to do with likely defense mechanisms of nematodes against the traps and death from Arthrobotrys, option A seems like the most plausible option out of all the options.
Option B seems incomplete while C and D have no direct relation with defense mechanism of nematodes against Arthrobotrys.
There are amphibians that are even larger than bullfrogs. Which of the following could explain how such a large amphibium could obtain a sufficient rate of diffusion of respiratory gases? Select all that apply: Select one or more: a. different shape (e.g. flat or ribbon shaped) b. dry skin c. reduced metabolic rate (reduced rate of cellular respiration) d. larger internal surface area of the lungs e. living in an environment of lower oxygen concentration
Answer:
a. different shape (e.g. flat or ribbon shaped).
d. larger internal surface area of the lungs.
Explanation:
Amphibians are cold blooded animals. They have a low rate of metabolism . Amphibians are located most where there is water or in moist environment because of their skin and how important it is to keep their skin moist.
Amphibians breathe through their skin and this can be called cutaneous respiration. Their lungs are not well developed therefore they undergo a very slow diffusion of oxygen through their blood.
For Amphibians that are larger than bull frogs, they obtain a very sufficient rate of diffusion of gases due to the following reasons:
a. Internal surface area of the lungs: Amphibians that are larger than bull frogs tend to have a more developed respiratory organs which means there lungs have a larger surface area and they are well developed.
b. They have a different body shape: Amphibians larger than bull frogs could have a flat or ribbon shape and their body shapes make it easier for respiratory gases like oxygen to permeate or enter their skin easily.
Large amphibians can adapt to ensure sufficient gas exchange via a few means: a different body shape to maximize surface area, a reduced metabolic rate to lower the demand for oxygen, and a larger internal surface area of the lungs for increased gas exchange sites. Dry skin and lower oxygen concentration environments are not beneficial for this process.
Explanation:In the context of Biology, amphibians rely on respiration through their skin and lungs to obtain oxygen. Therefore, large amphibians may have certain adaptations to ensure the efficient diffusion of respiratory gases. Some potential adaptations include:
Different shape: A flattened or ribbon-like shape can allow for a larger surface area in relation to its volume, encouraging more efficient oxygen diffusion.Reduced metabolic rate: By slowing down the metabolic reactions, they can reduce the demand for oxygen.Larger internal surface area of the lungs: A greater lung surface area allows for more sites where gases can be exchanged.Note that dry skin and lower oxygen concentration environment are not beneficial adaptations for gas exchange, as dry skin restricts gas exchange and a low oxygen environment would reduce the overall available oxygen for the amphibian.
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Ron works as a custodian's helper at a school, under the supervision of the custodian. Ron can read and write his name, and can read first-grade books. He moves slowly and sometimes with difficulty. Ron most likely suffers from?
Answer:
Moderate intellectual disability
Explanation:
Ron works as a custodian's helper at a school, under the supervision of the custodian. Ron can read and write his name and can read first-grade books. He moves slowly and sometimes with difficulty.
Ron most likely suffers from a moderate intellectual disability.
Such type of people can communicate in basic and simple ways. They may have physical signs of impairment.
Approximately 10% of people with intellectual disabilities fall into this category.
What is the lineage of a jawless vertebrate?
Answer:
Lamprey (agnathans) is the lineage of a jawless vertebrate.
Explanation:
Lampreys are jawless fishes (or agnathans), closely related to other living vertebrates, the jawed vertebrates (or gnathostomes). They, along with hagfish, are the only known surviving lineage of once diverse groups of jawless fishes. Living cyclostomes are modern yet they have some anatomic elements that appear to be retained from primitive members of their own groups, and possibly of primitive ancestral vertebrates. Lampreys are readily obtainable, and comparisons between lampreys and vertebrates are useful for the identification of developmental traits that are putatively derived from ancestral vertebrates. Of the two cyclostome groups, lampreys are the more experimentally tractable developmental models, and work has been done on a variety of species.
In the Morse code, a series of two signal types (dots and dashes) code for 26 different letters of the alphabet. How is this analogous to the genetic code? Select one: a. The bases that make up DNA are coded by the sugar-phosphate backbone. b. The machinery involved in DNA synthesis is analogous to the telegraph equipment used in sending Morse code. c. The bases of DNA code for the more complex amino acid sequence of the proteins in cells. d. There is complementarity in the genetic code (A is complementary to T, and C is complementary to G).
Answer:
c. The bases of DNA code for the more complex amino acid sequence of the proteins in cells.
Explanation:
The genetic code is the set of rules used by living cells to translate information encoded within genetic material e.g codons, into proteins.
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes. Morse alphabets have been developed for many non-English natural languages that use letters other than the 26 Roman letters.
The genetic code is to genetics what Morse code is to telecommunications.
Enzyme secreted in saliva that breaks starch into smaller particles and eventually into the disaccharide maltose Hormone secreted by the beta cells of the pancreas in response to increased blood levels of glucose. Hormone secreted by the alpha cells of the pancreas in response to decreased blood levels of glucose. Sucrose is commonly known as ______ Most common sucralose-based product ______. Fatty acids that must be consumed in the diet because they cannot be made by our bodies. Amino acids not produced by the body that must be obtained from food. Enzyme in the stomach that begins the breakdown of proteins into shorter polypeptide chains and single amino acids. Two or more foods that together contain all nine essential amino acids necessary for a complete protein. Molecule consisting of three fatty acids attached to a three-carbon glycerol backbone.
Explanation:
Sucrose is a disaccharide sugar, which means it is comprised of two monosaccharide sugar units. Sucrose is a characteristic synthetic found in plants, despite the fact that it can likewise be synthesized in a lab. It is a lot simpler and less expensive to extract it from plants than to make it without any preparation. Sugarcane and sugar beets are the two plants that are utilized to make most sucrose, or refined table sugar. Splenda is a manufactured sugar that isn't perceived by the body. Sucralose just makes up around 5 percent of Splenda. The other 95 percent contains a building operator called maltodextrin, which fills in as filler, and corn-based dextrose, a sort of sugar. Splenda is utilized as a sugar substitute in cooking and preparing, and it's additional to a great many "zero calorie" nourishment items.
Amylase initiates starch digestion in the mouth, forming maltose, while other enzymes like maltase continue the process in the small intestine. Essential nutrients like fatty acids and amino acids must be consumed in the diet, and pepsin is an enzyme that aids in protein digestion in the stomach. Triglycerides serve as a significant energy storage molecule in the body.
Explanation:Throughout the process of digestion, various enzymes and hormones play essential roles in breaking down the food we eat into usable nutrients. One such enzyme is amylase, which is secreted in the saliva and begins the digestion of starches by breaking them into smaller particles, eventually forming the disaccharide maltose. Once the food reaches the duodenum, pancreatic juices containing more amylase continue this breakdown. Disaccharides like maltose, sucrose, and lactose are further digested into monosaccharides (glucose, fructose, and galactose) by the enzymes maltase, sucrase, and lactase present in the small intestine.
As part of the dietary macronutrients required by our body, essential fatty acids and essential amino acids must be obtained through food, as our bodies cannot synthesize them. The digestion of proteins begins in the stomach, where the enzyme pepsin initiates the breakdown of proteins into shorter chains and amino acids. Combinations of different food sources, such as beans and rice, can provide all nine essential amino acids and are known as complementary proteins. Lastly, a triglyceride is a molecule consisting of three fatty acids attached to a glycerol backbone, serving as an important form of energy storage in our bodies.
In many tissues, one of the earliest responses to cellular injury is a rapid increase in the level of enzymes involved in the pentose phosphate pathway. Ten days after an injury, heart tissue has levels of G6PD and 6-phosphogluconate dehydrogenase that are 20 to 30 times higher than normal, whereas the levels of glycolytic enzymes are only 10 to 20% of normal. Suggest an explanation for this phenomenon.
Explanation:
Ten days after an injury, there is still cellular and tissue repair going on. Glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase are two enzymes involved in the pentose phosphate pathway which are also found in abundance in neutrophils and macrophages. These phagocytic cells of the immune system utilize NADPH to generate superoxide radicals from molecular oxygen, which are used to kill the pathogens or damaged cells they have ingested. The great rise in these two enzymes could be coming from these immune cells as they are cleaning up the damaged tissue. Additionally, these immune cells use these two enzymes to produce NADPH, which can be used to counterbalance oxidative stress via the action of the glutathione system. Injured tissue can cause oxidative stress and increase the need for action from the glutathione system. The glycolytic enzyme activity would be decreased as some of the glucose is shunted to the pentose phosphate pathway to favor tissue repair over the ATP generation which comes from the glycolytic pathway reactions.Siamese cats are characterized by light and dark regions of fur. The darker parts occur on the cooler parts of the cat's body because the enzyme that catalyzes the formation of the dark pigment is more active when cool. This example shows that enzymes are affected by .
Answer:
The correct answer is : temperature.
Explanation:
Siamese cats are known and characterized on the basis of the regions that are light or dark on the part of the body of these cats as according the cooler part of the body.
It is influenced by the enzyme that is active due to low temperature that leads to the formation of the dark pigment in the cooler area and in the part of the body that are higher in temperature are lighter due to inactivity of the enzyme.
Thus, the correct answer is : temperature.
Answer:
Temperature
Explanation:
I did the study island and got it right : )
What is nutrient pollution, and how does it get into the ocean? Where does it come from?
Answer:
Nutrient pollution is the process where too many nutrients, mainly nitrogen and phosphorus, are added to bodies of water and can act like fertilizer, causing excessive growth of algae. Nutrients can run off of land in urban areas where lawn and garden fertilizers are used. When the algae and seagrass die, they decay. When it rains, the growth aids in the soil drift. These substances eventually make their way into rivers and streams. Once they reach the ocean, the many nutrients, including high levels of nitrogen, that the fertilizers are carrying are released into the water.
Final answer:
Nutrient pollution occurs when excess nutrients enter aquatic environments and disrupt the ecosystem. It can come from sources such as human sewage and agricultural runoff. This pollution leads to algal blooms, oxygen depletion, and negative impacts on marine life.
Explanation:
Nutrient pollution occurs when excess nutrients, such as nitrogen and phosphorus, enter aquatic environments and cause an imbalance in the ecosystem. This pollution can come from various sources, including human sewage, agricultural runoff, and industrial discharges.
Human sewage can throw ecosystems out of balance by introducing high levels of nitrogen and phosphorus, which act as fertilizers for algae in the water. The excessive growth of algae leads to algal blooms, which deplete oxygen levels in the water and harm other aquatic organisms. This imbalance in nutrient cycles, particularly the nitrogen and phosphorus cycles, can disrupt the normal functioning of the ecosystem.
Agricultural runoff can also have detrimental effects on ecosystems. When fertilizers and pesticides used in agriculture are washed away by rain or irrigation, they can enter water bodies and contribute to nutrient pollution. This excess of nutrients can cause eutrophication, where algal blooms occur and deplete oxygen levels in the water, leading to dead zones where marine life cannot survive. These changes in the food web can result in a decline in fish populations and overall ecosystem health.
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Amino acid-derived and peptide hormones are unable to diffuse across a cell membrane because they are _____.
a. large
b. too complex
c. lipid-based
d. not easily dissolved in blood
e. polar
Answer: Option E) polar
Amino acid-derived and peptide hormones are unable to diffuse across a cell membrane because they are polar
Explanation:
Amino acid-derived and peptide hormones such as serotonin, epinephrine, dopamine etc, are unable to diffuse across a cell membrane because they consist of several repeating units of amino acids with positively charged or negatively charged side chains.
Thus, the side chains make these hormones water-loving (hydrophilic), and impassable to the hydrophobic layer of the cell membrane.
Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a(n)
A) competitive inhibitor of the enzyme.
B) noncompetitive inhibitor of the enzyme.
C) allosteric activator of the enzyme.
D) cofactor necessary for enzyme activity.
E) coenzyme derived from a vitamin.
Answer:
D) cofactor necessary for enzyme activity.
Explanation:
Carboxypeptidase is an enzyme found in the digestive system whose function is to hydrolyze a peptide bond in the terminal carbon of a protein. Said enzyme contains a zinc atom in its active site and when losing a zinc atom it would lead to loss of the activity of the enzyme, making it of great importance for the activity of the enzyme.
"After glycolysis, the fate of pyruvate depends on whether or not the cell has access to oxygen. Discuss the potential fates of pyruvate in the presence and absence of oxygen."
Answer:
Fate of pyruvate in the presence of oxygen:
-conversion to oxaloacetate by pyruvate carboxylase (biotin).
-conversion to Acetyl-CoA by Pyruvate dehydrogenase.
Fate of pyruvate in the absence of oxygen:
-conversion to lactate by lactic acid dehydrogenase.
Explanation:
Oxaloacetate can replenish the TCA cycle intermediates and be used as a substrate for gluconeogenesis.
Acetyl-CoA, which is formed by oxidative decarboxylation of pyruvate by the pyruvate dehydrogenase complex, is a major fuel used in the TCA cycle. Acetyl-CoA is also a building block for fatty acid synthesis.
Lactate, formed by the action of lactate dehydrogenase, is the final product of anaerobic glycolysis in eukaryotic cells. The formation of lactate is the major fate for pyruvate in the lens and cornea of the eye, kidney medulla, testes, leukocytes, and red blood cells, because these are all poorly vascularized and/or lack mitochondria.
Describe a multicellular exocrine gland
Answer:
They are produced or originated from an epithelial sheet(like the endocrine glands) but will never lose the duct connecting them to the free surface of the epithelial sheet (surface of the skin or lumen of the open body cavities. They transport their product through a duct on the epithelial surface.
They transport their product through a duct on the epithelial surface.
An exocrine gland that has an unbranched duct would be classified as a multicellular simple gland correct multicellular exocrine glands with unbranched ducts are simple those with branched ducts are compound unicellular exocrine glands do not have ducts
What is the difference between breathing and respiration
Answer:
Respiration is a chemical process while Breathing is a physical process.
Explanation:
Respiration can be said to be a continuous supply of oxygen molecules obtained from air or water. Oxygen here breakdown glucose in order to generate energy used by an organisms cell to function.
While Breathing is simply known to be an inhale and exhale process that takes place in the lungs.
Breathing refers to the physical process of inhaling oxygen and exhaling carbon dioxide, while respiration is a cellular biochemical process that breaks down food substances to produce energy.
Explanation:Although breathing and respiration are often used interchangeably, they refer to two distinct biological processes. Breathing refers to the process of inhaling oxygen from the environment and exhaling carbon dioxide back, which is a physical process. It involves the movement of air into and out of the lungs. This process is known as ventilation.
On the other hand, respiration is a chemical process that takes place in the cells. It involves a series of biochemical reactions that break down food substances to produce energy, releasing carbon dioxide as a byproduct. This energy is used by cells to function and support growth and other bodily activities. It is crucial to note that respiration, unlike breathing, does not involve the exchange of gases; instead, it is about the chemical transformation within cells.
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Question 5
The process where one group of species is replaced with others over time is called _____.
a. Climax community
b. Natural selection
c. Ecological succession
d. Evolution
Ecological succession is a biological process where one group of species is gradually replaced with another over time. It's a key mechanism of the diversity in ecosystems. For example, after a wildfire, grasses may first colonize the land then be replaced by shrubs and eventually trees.
Explanation:The process where one group of species is replaced with others over time is called ecological succession. This biological phenomenon happens when an ecological community undergoes a series of changes which leads to the replacement of one group of species by another group. For instance, after a wildfire, the land may initially be colonized by grasses, then shrubs and eventually trees. In each stage of the process, the existing community modifies the environment in ways that make it suitable for the next stage. This constant process is what shapes the diverse ecosystems.
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Plant cells - chloroplast - chlorophyll. All are needed for photosynthesis. Where does most of the photosynthesis take place in the plant?
A.Flower
B) fruit
C) leaves
D) stem
Answer: Option C) leaves
Explanation:
Autotrophs including green plants consists of cells that have chloroplasts, these chloroplasts possess a green coloured pigment called chlorophyll that are abundant in the leaves, and helps in receiving trapping sun light among other simple inorganic molecules like atmospheric carbon dioxide and water, necessary for the synthesis of sugar molecules during the process of photosynthesis.
Thus, the abundant presence of chlorophyll in leaves makes photosynthesis occur more in leaves
C) leaves Photosynthesis takes place inside plant cells in small things called chloroplasts. Chloroplasts (mostly found in the mesophyll layer) contain a green substance called chlorophyll. Below are the other parts of the cell that work with the chloroplast to make photosynthesis happen. the plant cells are found in the leaves
Endosymbiosis of cyanobacteria is widely accepted as an explanation for the development of chloroplasts. The presence of endosymbiotic cyanobacteria provided a cell with the advantage of ________.
Answer:
The correct answer is- photosynthesis
Explanation:
According to the endosymbiotic theory, an ancestral cell engulfed a cyanobacteria and lived in symbiotic association with that bacteria and over time this bacteria evolved into the chloroplast and the ancestral cell developed into plant cell.
So as cyanobacteria was the first aerobic cell that can evolve oxygen and can do photosynthesis to produce organic food so it could be concluded that the presence of endosymbiotic cyanobacteria provided a cell with the advantage of photosynthesis.
Imagine that you are a cell and you want to join two low energy molecules together. They resist joining. What two special types of molecules would you need to supply to overcome this obstacle?
Answer:
an enzyme and ATP
Explanation:
An enzyme is the term that is used for the catalysts in the living system which work to lower the activation energy of a reaction and hence, accelerate the rate at which the chemical reactions can occur.ATP is an organic molecule - Adenosine triphosphate which is responsible for providing energy to drive different processes in the living organisms, and thus, is also known as the energy currency of the cell.In the given case, the molecules that are to be joined have low energy and a resistance to come together, in such a situation the ATP will provide the energy for the molecules to come together and the enzymes will help orient the molecules in a suitable manner and accelerate the rate of reaction to ultimately join them.When explaining how carbon dioxide combines with water to form carbonic acid as part of an acid-base lecture, the faculty instructor emphasizes that which enzyme is needed as a catalyst for this reaction?
Answer:
Carbonic anhydrase is the enzyme that convert the Carbon dioxide and water into carbonic acid.
Explanation:
When aqueous form of carbon dioxide reacts with water,it produces carbonic anhydrase which is acidic.
The reaction is-
H₂O+CO₂⇒H₂CO₃
Carbonic acid is a volatile acid which play an important role in bicarbonate buffer system and thus it maintains acid base level.
Carbonic acid is a weak acid that form 2 type of salts that are carbonate and bicarbonate.
Carbonic acid causes dissolve of limestone.
It can't exist in pure form.
In a sample of pond water, a new organism is identified with the following characteristics: It consists of 70 cells surrounded by rigid cell walls, which join the cells together. Inside each of these identical cells are mitochondria and chloroplasts. Such an organism would most likely be classified as a
colonial photosynthetic eukaryote
Explanation:
Colonial protists are individual protists that form a colony and act as a larger, multicellular organism. This colony may consist of many individual protists of the same species, but what's really cool about them is that instead of acting as individuals they work together to function as one large group, benefiting from each other Most protists are unicellular, but some like kelp is multicellular organisms. Some, known as the plant-like protists photosynthesize, while others that do not photosynthesize are called animal-like protists. Others still are called fungi-like or slime molds because they somewhat resemble fungi, though again there is no evolutionary relationshipThe organism described in the question, containing 70 cells with mitochondria, chloroplasts, and rigid cell walls, would be classified as a colonial photosynthetic eukaryote.
Explanation:The organism described - composed of 70 cells, each with mitochondria and chloroplasts, and surrounded by a rigid cell wall - can be classified as a colonial photosynthetic eukaryote. The presence of rigid cell walls, mitochondria, and chloroplasts indicates that the organism is a eukaryote. Eukaryotic cells are complex and contain a nucleus and other organelles. Additionally, the fact that the cells have chloroplasts infers that the organism is capable of photosynthesis, fueling itself through sunlight. The structure itself, made up of several identical cells working together, implies that the organism is colonial in nature.
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Today, entire populations of frogs, toads, and salamanders are vanishing without a trace. Recent studies implicate a wide array of factors. What is the second greatest cause of decline for threatened species?
Answer: Pollution
Explanation:
There are many population that is about to extinct or has been entered into rare species because of the conditions around them.
The entire population of the organism such as salamanders, frogs are vanishing due to several factors. These factors are killing, invasive species and pollution, climatic conditions, et cetera.
The first factor is killing of organism due to various reasons and second important factor is pollution due to which their growth is decreasing and they are dying.
The cytoplasm of a certain cell, such as a neuron, already has a high concentration of K ions. How can K ions continue to enter the cell and continue to increase in concentration
The question is incomplete as it does not have the options which are:
A. endocytosis
B. active transport
C. facilitated diffusion
D. infusion
E. osmosis
Answer:
B. active transport
Explanation:
The neuron cell involves the influx and efflux of the sodium and potassium ions. These ions move through membrane proteins by facilitated diffusion and active transport.
The active transport allows the movement of ions against the concentration gradient that is even if the concentration of ions is higher.
In the given question, although the potassium ions are higher in the cytoplasm of the neuron, the potassium ions can enter the cell through active transport.
Thus, active transport is correct.
Despite a high concentration of potassium ions (K+) in a neuron, more K+ can continually enter the cell owing to a process called active transport, which uses energy to drive substances against their concentration gradient. Particularly, the Sodium-Potassium Pump helps maintain a high concentration of K+ ions inside the cells.
Explanation:This question pertains to cellular biology, which can be brought to light by the example of a neuron, a type of cell in our bodies. Even if the cytoplasm of a cell already contains a high concentration of potassium ions (K+), these ions can continue to enter the cell due to a process called active transport.
Active transport is a cellular mechanism that uses ATP (Adenosine Triphosphate), an energy source, to move substances against their concentration gradient. Meaning, substances move from an area of low concentration to an area of high concentration, which in most cases would require energy. In the case of a neuron, the Sodium-Potassium Pump, a crucial active transport mechanism, continuously moves K+ ions into the cell, ensuring that the cell maintains a high resting potential inside in relation to the outside of the cell.
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In addition to discrete, Mendelian traits, we have many traits that are influenced by genes on several different chromosomes. These are called ___________ traits:
Answer: Polygenic inheritance
Explanation: Polygenic inheritance is when a character is controlled by more than two genes. This inheritance includes skin color,eyes color,hair color,height non visual genes such as blood pressure,intelligence Autism and longevity.