True
Explanation:
A graph is used to represent and compare two phenomenons or variables.
It is a simple system that uses x and y coordinates.
A good graph must have properly labelled axis which can be any variable. They must have an origin. A graph must have a suitable scale. They must have a descriptive title. They must convey information in a simple way.learn more:
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Since Watson and Crick described DNA in 1953, which of the following might best explain why the function of small RNAs is still being explained?
a. As RNAs have evolved since that time, they have taken on new functions.
b. Watson and Crick described DNA but did not predict any function for RNA.
c. The functions of small RNAs could not be approached until the entire human genome was sequenced.
d. Ethical considerations prevented scientists from exploring this material until recently.
e. Changes in technology, as well as our ability to determine how much of the DNA is expressed, have now made this possible.
Answer:
The answer is E
Explanation:
Work has been done on the functions of RNA over the years involving a group of scientists and their teams.
These scientists include Brenner, Crick, Meselson, as well as Watson.
There were limitations to establishing the functions of RNA, one of which access to more primitive techniques, machines and equipment stands out.
This limited the amount of knowledge scientists had access to about RNA but as time went by , the function of RNA was established to be linked to DNA.
Better technology provided better techniques to determine how much DNA is expressed and how much RNA functions in translating and transcribing the information carried in DNA which in turn, provides a template for the functions of the RNA present in cells.
The correct option is e. Changes in technology, as well as our ability to determine how much of the DNA is expressed, have now made this possible.
The function of small RNAs is best explained by advancements in technology and our enhanced ability to understand DNA expression. Discoveries such as ribozymes and the RNA world hypothesis have shifted our understanding of RNA's role in genetics and cellular functions.
Since Watson and Crick described DNA in 1953, the best explanation for why the function of small RNAs is still being explained can be attributed to 'Changes in technology, as well as our ability to determine how much of the DNA is expressed, have now made this possible.' Over time, our understanding of RNA has evolved significantly. Initially thought to serve merely as an intermediary between DNA and protein synthesis, the discovery of ribosomes and the concept of an 'RNA world' have greatly expanded our perspective on RNA's capabilities. These developments underscore RNA's role in genetic information storage, catalysis, and regulation within cells. The technological advancements in genomics, bioinformatics, and molecular biology have enabled scientists to unravel the complexities of RNA dynamics and functions, thus continuously revealing new insights into RNA's role in life's fundamental processes.
A population of 100 butterflies living on an acre of land loses three-quarters of its members when a sudden freeze in the spring occurs just after they emerge as caterpillars. This population has undergone a reduction in population size due to
A. a density-independent factor.
B. natural selection.
C. an intrinsic factor.
D. a density-dependent factor.
Answer: Option A (Density-independent factor)
Explanation:
Density-independent factor is a population regulation factor that affect or influence the size of a population without considering the population density. Climate and weather are the main density-independent factors in nature.
Their effects increment is directly proportional to the increase in population size. These factors are environmental agents that checkmate the size of a population without putting the reproductive and behavioral patterns of the organisms into consideration.
A patient has taken levodopa [Dopar] for Parkinson's disease for 2 weeks but reports no improvement in the symptoms. Which response by the nurse is correct?
a. "Another agent will be needed to manage your symptoms."
b. "Double the dose to see whether an effect occurs."
c. "It may take several months for a response to occur."
d. "The prescriber may need to change your drug regimen."
Answer:
Option-D
Explanation:
Parkinson's diseases are a neural disorder which affects the movement of the human body. The disease is caused by the low production or no production of dopamine by the neurons which thus interfere with the impulse transfer and thus movement.
In the given question, the patient with Parkinson's disease is provided with levodopa but no improvement is observed therefore the prescriber must change the drug regimen, for example, the levodopa should be given in combination with carbidopa. These medications enter the blood-brain barrier and get converted to the dopamine.
Thus, Option-D is the correct answer.
Some volcanoes have explosive eruptions, like the one at Mount St. Helens in 1980. Eruptions like these can cause abrupt changes to Earth's surface. Which of these could result from an explosive volcanic eruption? A. Part of the volcano is blasted away. B. Volcanic ash covers the surrounding area. C. A flow of ash and debris rushes down the volcano's slope. D. all of these
Answer:
D
Explanation:
A client is diagnosed with a mild case of an autoimmune disorder and is beginning a treatment regimen. What is the mainstay of treatment with an autoimmune disorder?
Explanation:
An autoimmune disorder occurs when the body sees it's own cells as foreign antigens and begins to attack them.
The treatment depends on the particular autoimmune disorder; however, the mainstay of treatment is the use of IMMUNOSUPPRESSIVE MEDICATION. Examples include corticosteroids (such as prednisone) and nonsteroid drugs such as azathioprine, cyclophosphamide, mycophenolate, sirolimus, or tacrolimus.
A group of students is investigating whether silver is a better thermal conductor than copper. The students take a silver wire and a copper wire of the same length and diameter. They put equal lengths of wax on one end of each wire and dip the other end into a beaker of hot water. The length of wax left on the wires after 10 minutes is shown. Experimental Observations Silver Copper Original length of wax 3.5 cm 3.5 cm Length of wax after 10 minutes 1.2 cm 2 cm What was a control variable in this experiment?
The control variable in this experiment is the original length of wax 3.5 cm applied to both the silver and copper wires.
A control variable is described as an element of an experiment that remains constant across all test groups which allows you to isolate the effect of the independent variable on the dependent variable.
In the experiment, the students kept the original length of wax the same for both wire which ensures that any difference in the amount of wax melted after 10 minutes is due to the differing thermal conductivity of silver and copper, not because of variations in the initial wax amount.
Variables like the temperature of the water and the diameter of the wires, were also likely kept constant to further minimize the influence of factors other than the wire material.
In conclusion, we can say that by controlling the initial wax length, the students created a fair comparison between the thermal conductivities of silver and copper, allowing them to draw valid conclusions from their experiment.
Why doesn’t Vladek tell the doctor in the hospital about his glass eye? What does this say about Vladek’s character?
Answer:
This is not a Biology question.
This is a question from the graphic novel Maus
Explanation:
Vladek didn't tell the doctor about his glass eye because he didn't want the doctor to feel embarrassed.
This indicates that Vladek was a considerate, compassionate and good-hearted man.
The 911 dispatchers who are specially trained to give prearrival instructions tocallers, such as how to control bleeding or how toperform, CPR arecalled:
A. base hospitals.
B. physicians.
C. Emergency Medical Dispatchers.
D. medical directors.
Answer:
Correct answer is ''c'' Emergency Medical Dispatchers
Explanation:
A 911 emergency medical dispatcher is a professional communicator who is trained to gather information related to medical emergencies, they must provide assistance and instructions by voice, prior to the arrival of the (EMS) regularly they use a series of key questions, pre-arrival instructions, and dispatch priorities to be used in the processing of EMS calls.
Final answer:
911 dispatchers trained to provide medical instructions are called Emergency Medical Dispatchers, playing a vital role in EMS by guiding callers in critical situations before help arrives. (Option C)
Explanation:
The 911 dispatchers who are specially trained to give prearrival instructions to callers, such as how to control bleeding or how to perform CPR, are called Emergency Medical Dispatchers. These professionals play a critical role in the emergency medical services (EMS) system by providing immediate guidance and instruction over the phone before paramedics or medical help arrives on the scene. In addition to their vital communication role, Emergency Medical Dispatchers have to make fast decisions, giving them a significant place within the chain of survival in emergency situations, particularly when life-saving interventions like CPR are required.
Peptidoglycan is a polymer of millions of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) sugars based on glucose molecules linked together in long chains cross-braced with four amino acids that link individual polymer chains together in a chain-link fence pattern. Layers of cross-braced NAG and NAM sheets are stacked vertically and held together by proteins with lipid anchors attached to the cell’s cytoplasmic membrane to form a scaffold of sugars and proteins that is able to hold the bacterial cell’s shape, even in response to extreme osmotic pressures. How would you expect a microbiology student to be able to describe the composition of peptidoglycan? What is the composition of the peptidoglycan layers found in the cell wall of bacteria?
Answer:
NAG, short amino acid chains,NAM, lipid and proteins.
Explanation:
The cell wall is the outer covering of the cell lies on the adjacent of the plasma membrane. The cell wall is present in the archaea, bacteria, plants, fungi and absent in the animal cells.
As the inofrmation given in the question, the cellwall consists N-acetylmuramic acid (NAM) and N-acetylglucosamine (NAG). These sugar residues helps n the cross linking with the proteins. The lipids and proteins are the important component of the cell membrane that maintains the shape and function of the cellwall.
Thus, the answer is NAG, short amino acid chains,NAM, lipid and proteins.
Prior to entering the Krebs Cycle, each pyruvate molecule loses electrons, hydrogen ions, and a carbon, forming an energy-rich molecule of
a. Acetyl-CoA
b. Citrate
c. Oxaloacetate
d. Malate
Answer:
a. Acetyl-CoA
Explanation:
Pyruvate is decarboxylated in the matrix of mitochondria and loses its carbon as CO2. This decarboxylation is accompanied by its oxidation as well. This process of oxidative decarboxylation of pyruvate is catalyzed by an enzyme complex. It is called the pyruvate dehydrogenase enzyme complex. NAD+ accepts the released electrons and pyruvate is converted into energy-rich acetyl CoA which in turn enters into the Kreb's cycle.
After glycolysis, each pyruvate molecule is converted into Acetyl-CoA, losing a carbon in the process, before entering the Krebs Cycle.
Explanation:The Krebs Cycle, also known as citric acid cycle takes place in the matrix of the mitochondria and is a key component of cellular respiration in eukaryotes. After the process of glycolysis, which breaks down glucose into two three-carbon pyruvate molecules, each pyruvate is converted into an energy-rich molecule of Acetyl-CoA before entering the Krebs cycle. During this conversion, pyruvate loses a carbon (which is released as CO2), and the remaining two carbons are transferred to Coenzyme A, resulting in the formation of Acetyl-CoA.
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Jared was working in a hot dish room all afternoon, sweating. After his shift, he stepped out into a cold December night and got "goose bumps." What type of homeostatic regulation best describes these physiological responses?
a. receptor-mediated homeostasis
b. autoregulation
c. positive feedback
d. extrinsic regulation
Answer:
Answer is D. Extrinsic regulation.
Explanation:
Extrinsic regulation is a type of regulation involving the activity of the nervous system or the endocrine system. Their activities bring about responses environmental changes.
The nervous system work by sending electrical signal while the endocrine system work by sending chemical signal, to adjust the activities of many systems in the body to the changes in the environment.
Extrinsic control involves the activity of outside organ to control another organ in homeostasis, while intrinsic control involves the activity of the actual organ to maintain homeostasis in itself.
Note that, homeostasis is the ability to maintain internal temperature to complement the changes in the environment.
The body's responses of sweating when hot and getting goose bumps when cold are examples of extrinsic regulation, a form of homeostatic regulation carried out by the nervous and endocrine systems in response to environmental changes.
Explanation:Jared's physiological reactions—sweating when hot and experiencing goose bumps when cold—are examples of extrinsic regulation. This type of homeostatic regulation involves responses controlled by the nervous and endocrine systems. When Jared was hot, his body released sweat to cool down, and when he stepped into the cold, his body contracted muscles to create 'goose bumps' in an attempt to conserve heat. Both processes are examples of how our bodies maintain internal balance in response to external changes, a key aspect of extrinsic regulation.
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Researchers are interested in studying the evolution of fur color in a population of desert mice. They have found that there is a single locus with two alleles that influence fur color.
If this population is not evolving with respect to fur color, which of the following is true?
a) The frequency of the two alleles in the population are the same.
b) The frequency of the two homozygote genotypes in the population are the same.
c) The population is in Hardy-Weinburg equilibrium.
d) Half of the population is heterozygous.
Answer:
p
Explanation:
p
Brandon is interested in the field of nursing, but does not currently have a lot of time or the financial resources for training. Which of the following nursing careers would be best for him to pursue at this time?
Answer:
License vocational nurse
Explanation:
A license vocational nurse also known as a license practical nurse works under the supervision of a qualified registered nurse or a physician providing bedside care to patients. They as well collect samples for testing in the laboratory, also they can as well deliver ,care and feed infants.
A licensed practical nurse can also supervise nursing assistants or aides.
Answer:A licenced Vocational Nurse
Explanation:
A licensed vocational nurse's duties revolve around basic patient care. LVNs monitor their patients' vital signs and keep their charts up to date. They assist patients in basic hygiene and personal care, including bathing and dressing them and helping them eat if necessary.
Cranial nerve II, the optic nerve sends nerve impulses to the brain carrying information about the things we see. These nerve fibers most likely belong to which division of the nervous system?A) sensory (afferent) divisionB) somatic nervous systemC) sympathetic divisionD) parasympathetic division
Answer:
A) sensory (afferent) division
Explanation:
The peripheral nervous system has two distinct divisions with different functions. The sensory or afferent division is one of them. The sensory or afferent division serves to deliver the sensory information from the receptors to the central nervous system. The neurons that carry sensory information are called sensory neurons. Cranial nerve II carries the sensory impulses about vision from the retina to the brain (a part of the central nervous system). This makes this nerve a component of the sensory division of PNS.
The composition of the cell wall allows for the expansion and contraction of the cell wall in response to the gain or loss of water from the cell.a) trueb) false
Answer:false
Explanation:the cell wall is a rigid , protective wall that surrounds the plasma membrane.
The rigidity of the cell wall is due primarily to the presence of cellulose and other materials such as lignin and pectin.
Cellulose is a polysaccharide and the plant cell wall is made up of several molecules of it.
Lignin is a rigid and impermeable material and deposited on the cellulose as an extra reinforcement on the cell wall.
Pectin are found in the middle lamellae and helps to cement the adjacent cell walls.
There is also hemicellulose which binds to the cellulose mifilaments.
The cell wall may also possesses plasmodermata,which are pores through which water and nutrients pass adjacent cells.
This rigid covering of the cell prevents it from expanding and shrinking due to water movement in and out of the cells
A 32-year-old female client has been diagnosed with a superinfection and has been prescribed tigecycline. What is a priority nursing action?
a-Educate the client about the need to supplement oral contraceptives with another form of birth controlb-Assess the client's blood pressure prior to administering the first dose and monitor closely for the first 12 hoursc-Assess the client carefully for recreational drug used-Educate the client about the need to avoid OTC antihistamines during treatment, due to the risk for anticholinergic effects
Answer:
Educate the client about the need to supplement oral contraceptives with another form of birth control.
Explanation:
Tigecycline is used as an antibiotic to prevent the bacterial infections. This drug is given intravenously. This drug is mainly taken against the bacterial resistant infections.
The unplanned pregnancies can be prevented by taking the oral contraceptives. The antibiotics that are taken can interfere with the mechanism of the oral contraceptive. Some barrier contraceptive must be given to woman when taking contraceptives to increase its effectiveness.
Thus, the correct answer is option (a).
When a woman is prescribed tigecycline for a superinfection, the priority nursing action is to educate her about its potential to reduce the effectiveness of her oral contraceptives, and the need for an additional form of birth control during treatment.
Explanation:When a female patient has been diagnosed with a superinfection and is prescribed tigecycline, a key nursing action involves educating the client about the potential interactions of this medication with oral contraceptives. Tigecycline, like many antibiotics, can interfere with the effectiveness of hormonal contraceptives. Hence, the client should be educated about the need to supplement oral contraceptives with an additional form of birth control during the course of the treatment to prevent an unintended pregnancy. Thus, option (a) - Educate the client about the need to supplement oral contraceptives with another form of birth control, is the priority nursing action.
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The cell membrane is a double membrane made of ____________ that have their water-soluble heads facing the interior and exterior of the cell.
Answer:
Phospholipids.
Explanation:
Phospholipids are the lipids that have both polar and nonpolar components in their structure. They have a glycerol molecule to which a phosphate group is bonded. This makes their polar head. Two fatty acid chains are also linked to the glycerol of phospholipids which in turn make their nonpolar tails. The membranes have two layers of phospholipids. The polar heads of the two layers face the surroundings watery medium. On the other hand, the non-polar tails of phospholipids of a bilayer are oriented towards the inner core of the membrane.
A nurse is teaching parents how to use an Epi-Pen for their child, who has a peanut allergy. Which statement by the parents indicates understanding of the teaching?
a. "After using the Epi-Pen, we must go to the emergency department."
b. "The Epi-Pen should be stored in the refrigerator, because epinephrine is sensitive to heat."
c. "The teacher should call us when symptoms start so that we can bring the Epi-Pen to school."
d. "We should jab the device into the thigh until it is empty of solution."
Answer:A
Explanation:
The correct option is a. After using the Epi-Pen, we must go to the emergency department.
This statement indicates understanding because it reflects the critical action that must be taken after administering epinephrine with an Epi-Pen. The use of an Epi-Pen is for emergency treatment of a severe allergic reaction, such as anaphylaxis, and it is essential to seek immediate medical attention following its use, even if the symptoms appear to improve. This is because the effects of epinephrine are temporary, and additional treatment or observation may be necessary to ensure the individual's safety.
Let's evaluate the other options to understand why they do not indicate the same level of understanding:
b. The Epi-Pen should be stored in the refrigerator, because epinephrine is sensitive to heat. - This statement is incorrect. Epinephrine should not be refrigerated as it can lose potency when exposed to light and heat. The Epi-Pen should be stored at room temperature, away from direct sunlight and heat sources.
c. The teacher should call us when symptoms start so that we can bring the Epi-Pen to school. - While communication with the school is important, this statement suggests that the parents need to be present to administer the Epi-Pen. School staff should be trained to recognize the signs of an allergic reaction and to administer the Epi-Pen if necessary, without waiting for the parents to arrive.
d. We should jab the device into the thigh until it is empty of solution.- This statement is incorrect and potentially dangerous. The Epi-Pen should be jabbed firmly into the thigh muscle for a count of 10, which is the time it takes for the medication to be delivered. Holding it in place until it is empty is unnecessary and could cause harm. The device is designed to automatically inject the correct dose of epinephrine when used properly.
Darwin's opinion that living forms must be descended from extinct forms was based on ________ evidence.
Answer:
fossil
Explanation:
Fossils are remnants of living organisms that have been preserved as a result of natural processes such as carbonization, mineralization, etc.
Darwin studied the remains of animals when he worked as a naturalist during the expedition with HMS Beagle between 1831 and 1836. It was during this period he observed that the living forms of some animal species looked in some ways like their extinct counterparts.
He then concluded that living forms, though different in some ways from their extinct counterparts, must have descended from the extinct form with some modifications.
A trait that is affected by many factors, both genetic and environmental, that enhance, halt, shape, or alter the expression of genes, resulting in a phenotype that may differ markedly from the genotype, is said to be __________.
Answer: A trait that is affected by many factors, both genetic and environmental, that enhance, halt, shape, or alter the expression of genes, resulting in a phenotype that may differ markedly from the genotype, is said to be MULTIFACTORIAL.
Explanation: Multifactorial inheritance may be presented by a model in which liability to a disorder is dependent on combination of genetic factor and environmental factor. Examples of trait with this mode of inheritance are neural tube defects, cleft lip and congenital dislocation of the hip.
In 2004, scientists announced the discovery of the fossil remains of some extremely short early humans on the Indonesian island of Flores. The new species has been named Homo floresiensis. One hypothesis is that H. floresiensis evolved from Homo erectus, another early human species. How did a population of H. erectus become isolated on this remote island.
Answer: The most accepted guess is: By bamboo rafts.
Explanation:
There are two hypotheses.
The first is that they arrived on Flores as Homo erectus and then evolved to Homo floresiensis. The second is that they were already Homo floresiensis when they arrived. This second one is the more accepted hypothesis because it would take organization and language to accomplish this technological water transportation feat. Homo erectus is not known to have developed speech.
Now at the time this transport was estimated to have happened, 100000 years ago, the islands of Komodo and Flores were joined and visible from the mainland. Together they constituted a 19km wide straight visible that could be easily seen from the mainland. The Homo floresiensis tribes built bamboo rafts, or possibly some other floating apparatus made if wood, and sailed there. The islands then progressively drifted apart, isolating them.
PS: It is important to note that some things may have drove them there such as famine, violence, etc.
Please help!!! Punnett squares in biology.
Answer:
She must be heterozygous for blood type B.
Monohybrid cross
Explanation:
See the two options of punnet squares attached.
The only possible way they could have a child with a type A phenotype is if the mother is heterozygous (BO), where they have a 1:4 chance.
This type of square is called a monohybrid cross, as we are looking at 1 trait
Which of the following features of Salmonella prevent it from being phagocytosed?
a. Flagella
b. Invasins
c. Fimbriae
Answer:
a. Flagella
Explanation:
Salmonella spp. is a motile enterobacteria with peritrichous flagella surrounding round the body of the bacterial organism. It is a type of bacterial infection that affects the walls of the gastrointestinal tracts. Movement in the gastrointestinal tracts is aided by the use of whip-like structure known as flagella and the use it as a defense mechanism from their host cells when they are about to be phagocytosized.
Phagocytosis is the action of using the plasma membrane to engulf a large partice, substance or organism in the cell.
The large size of the daughter oocyte after meiosis II results from the uneven distribution of the cytoplasm, which allows the zygote to divide mitotically before it begins growing.A) True B) False
Answer:
True
Explanation:
Oogenesis includes the formation of one egg cell from a single oocyte or egg mother cell. The diploid primary oocytes in the ovaries enter into the first meiotic division and form a haploid secondary oocyte and a haploid first polar body. After fertilization, the secondary oocytes complete the meiosis-II and forms one large ovum and a second polar body. The ovum formed by meiosis-II is much larger than the second polar body due to the unequal distribution of cytoplasm during meiosis-II. This imparts enough amount of cytoplasm in the zygote to support the mitosis without any cell growth.
Which one of the following represents quantitative data? a) whether an endangered California condor successfully raises a condor chick b) offspring gender c) whether you play a college sport d) levels of nitrate pollution in local waterways
Answer:
d) levels of nitrate pollution in local waterways
Explanation: This type of data can be expressed and measured numerically.
Imagine that you travelled back in time to the early 1940s. You meet a group of scientists, and tell them that DNA is the hereditary material. Why might the scientists refute your statement?
Please choose the correct answer from the following choices, and then select the submit answer button.
DNA is linear and appears relatively "simple."
DNA does not appear to (directly) carry out many cellular functions.
Proteins can have intricate three-dimensional structures.
Proteins are integral parts of many cellular processes.
All of these choices are correct.
Answer:
All of these choices are correct.
Explanation:
Before the discovery of DNA as genetic material, proteins were considered to be the biomolecules that store genetic information. Proteins are present in all the cells. They are present in the form of complex secondary and tertiary structures. Proteins are involved in almost all cellular processes in the form of enzymes. Proteins present in the cell determine the phenotype of organisms. Therefore, the complex structures of proteins were supposed to be the carrier of the genetic information.
On the other hand, the linear structure of DNA was considered to be too simple to serve as a carrier of genetic information. Also, DNA molecules do not directly determine the phenotype and are not directly involved in a number of cellular processes. So, DNA was not considered to be a molecule to serve as genetic material in the early 1940s.
Untreated diabetes mellitus can lead to a condition in which the blood is more acidic than normal. Name two organ systems that play the largest role in compensating for acid-base imbalances.
Answer:
The two organ systems in the body that play the largest role in compensating for acid-base imbalances are the pulmonary and renal systems.
Explanation:
i. The renal system compensate for acid-base imbalances by reabsorbing bicarbonate and excreting fixed acids. kidney excretes or reabsorbs these substances during disease state which affect pH.
ii. The pulmonary system compensate for pH by using carbon dioxide; expiration removes carbon dioxide from the body which is released to the environment. Carbon dioxide in the body forms carbonic acid when combine with water. The amount of carbon dioxide expired can cause pH to increase or decrease. The respiratory system's effect on metabolic pH disturbances occurs in minutes to hours.
The respiratory system and the urinary system play the largest role in compensating for acid-base imbalances in untreated diabetes mellitus.
Explanation:The two organ systems that play the largest role in compensating for acid-base imbalances in untreated diabetes mellitus are the respiratory system and the urinary system.
Respiratory System: The respiratory system helps regulate the acid-base balance by controlling the levels of carbon dioxide (CO2) in the blood through breathing. When blood becomes more acidic, the respiratory system increases breathing rate to expel excess CO2 and decrease acidity.
Urinary System: The urinary system helps regulate the acid-base balance by controlling the levels of bicarbonate ions (HCO3-) in the blood through urine production. When blood becomes more acidic, the urinary system increases the reabsorption of bicarbonate ions and excretes more hydrogen ions (H+), thus reducing acidity.
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A 2-year-old child was playing with his toy cars outside when his mother noticed the child becoming cyanotic. You and your partner arrive on scene to find that one of the wheels from the truck has become lodged in the child's throat. Where is the wheel most likely lodged?
Answer:
The correct answer would be - cricoid cartilage (upto age of 5).
Explanation:
Discoloration or bluish color near the skin. It is occurred due to the high blood level with decreased hemoglobin in the near the skin surface. Hemoglobin is the protein that helps in transport of oxygen in the blood. This condition of bluish skin color due to deoxygenated blood known as the cyanotic.
Cricoid cartilage is the narrowest part of a child's airway until about the age of 5, where the wheel of the truck most probably stuck or lodged.
Thus, the correct answer is - cricoid cartilage
An adult inhales about 6.0 x 10⁻⁴ m³ of fresh air during a breath. Only 20% of fresh air is oxygen. Assume the pressure in the lungs is 1.0 x 10⁵ Pa and the air is at a temperature of 300 K.
How many oxygen molecules are in each breath?
A. 1.4 x 10²³
B. 2.9 x 10²¹
C. 4.9 x 10⁻⁴
D. 2.9 x 10²⁵
Answer: B. [tex]2.9\times 10^{21}[/tex]
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
Given : Volume of fresh air = [tex]6.0\times 10^{-4}m^3[/tex]
volume of oxygen =[tex]\frac{20}100}\times 6.0\times 10^{-4}m^3=1.2\times 10^{-4}m^3[/tex]
According to the ideal gas equation:
[tex]PV=nRT[/tex]
P = Pressure of the gas = [tex]1.0\times 10^{5}Pa[/tex] = 0.98 atm
V= Volume of the gas = [tex]1.2\times 10^{-4}m^3=0.12L[/tex] [tex]1m^3=1000L[/tex]
T= Temperature of the gas = 300 K
R= Gas constant = 0.0821 atmL/K mol
n= moles of gas= ?
[tex]n=\frac{PV}{RT}=\frac{0.98atm\times 0.12L}0.0821\times 300}=4.8\times 10^{-3}moles[/tex]
1 mole of oxygen contains = [tex]6.023\times 10^{23}[/tex] molecules
Thus [tex]4.8\times 10^{-3}moles[/tex] of oxygen contain=[tex]\frac{6.023\times 10^{23}}{1}\times 4.8\times 10^{-3}=2.9\times 10^{21}[/tex] molecules of oxygen
Thus there are [tex]2.9\times 10^{21}[/tex] oxygen molecules in each breath
With regard to the destruction of tropical forests, the focus is often on biodiversity and the impact to these ecosystems. What is a direct benefit to humans that helps explain why these forests need to be preserved?
Answer:
The diversity could contain novel drugs for consumers.
Explanation:
The biodiversity may be defined as the different types of the living organisms are present on this planet. The biodiversity depends on the factors like temperature and light.
The biodiversity shows unequal distribution on the earth. The biodiversity of the forests might provide the different types of flowers, fruits and wood that can directly be used by the other organisms. Different types of plant diversity may provide the different types of drug used for the disease treatment.
Thus, the answer is the diversity could contain novel drugs for consumers.
The given question is not complete as it lacks the option that are necessary to answer the question, however the appropriate options are as follows:
A) Natural and undisturbed areas are important wildlife habitats.
B) This diversity could contain undocumented insect species.
C) The diversity could contain novel drugs for consumers.
D) The plant diversity provides shade, which lowers global warming.
Answer:
The correct answer would be - option c. diversity could contain novel drugs for consumers.
Explanation:
Biodiversity is the total living organisms present in a particular ecosystem in loosely terms. The destruction of the tropical forest will be directly affected and their will be negative impact on the ecosystem.
These forests are need to be preserved because these forests are help in maintaining the ecosystem and provide several products. The one iof the direct benefits to the humans are these diversity could have various drugs that help consumers.
Thus, the correct answer is option C.