Answer:
Option (b).
Explanation:
Breathing may be defined as the inhalation of oxygen and exhalation of carbon dioxide. The breathing depends on the various internal and external factors.
The partial pressure of oxygen is directly proportional to the breathing and the inhalation of oxygen in the body. The altitude contains lower atmospheric pressure and the partial pressure o the oxygen decreases at high altitude. The decrease in the partial pressure of the oxygen reduces the affinity of oxygen with hemoglobin and thus an individual feels difficulty in breathing.
Thus, the correct answer is option (b).
Fatty acid metabolism disorder is an autosomal recessive disorder. Two unaffected parents have 6 children - all of whom are unaffected. List all of the mother's possible genotypes.
Answer:
There are only 2 possible genotypes for the mother, FF and Ff.
Explanation:
Because it is an autosomal inheritance, this case F will be the dominant allele and f the recessive allele, where f produces Fatty acid metabolism disorder. If the mother does not possess the disorder, she must possess at least one dominant allele for that specific gene. However, for the other allele, we cannot assure that it is dominant, since it can be recessive and not express itself either in her or in the offspring, because of the father we also only know his dominant allele.
Describe the sliding filament theory of muscle contraction. Be sure to use the terms actin and myosin in your answer.
Answer:
The sliding filament theory is the illustration that how the contraction of muscles takes place in order to generate force. At the start of the process, the motor neuron instigates an action potential or impulse to pass down a nerve cell to the neuromuscular junction. This activates the sarcoplasmic reticulum, which discharges calcium into the cells of the muscles.
When calcium comes within the muscle cells, it combines with troponin, thus, permitting the binding of actin with myosin. The actin and myosin bind with each other and form cross-bridges, which further contracts by utilizing ATP as the source of energy.
ATP is manufactured again, thus, permitting actin and myosin to sustain their strong binding condition. Relaxation takes place when stimulation of the nerve ceases. Calcium is then moved back within the sarcoplasmic reticulum dissociating the association between the actin and myosin.
The actin and myosin go back to their unbound condition making the muscle to relax.
as you increase the magnification,describe what happens to
thefield of view?
Answer:
The correct answer is - decrease the area of the field of view.
Explanation:
In the microscope, if you increase the magnification power of the objective lens it will result in a decrease in the field of the view. The magnification power is inversely proportional to the field of view which means if decrease the magnification it will lead to an increase in the field of view and vice versa.
The specimen looks larger with a higher magnification as it results in a smaller part of the specimen is exposed or spread out to fill the field of the view.
Thus, the correct answer is option - decreases the area of the field of view.
While the Cenozoic is often incorrectly referred to as the "Age of Mammals", in what time period were synapsids the dominant terrestrial vertebrates?
a. permian
b. triassic
c. jurassic
d. cretacous
e. devonian
The correct answer is A. Permian.
Explanation
The synapsids were terrestrial vertebrate mammals or animals related to them rather than to reptiles or birds that lived during the Permian (a period that began about 299 million years ago and ended about 251 million years ago) and were the dominant terrestrial vertebrates during it. These animals survived until the Triassic; however, due to the Permian-Triassic extinction, they were not the predominant vertebrate as in the previous period. Later, during the Cretatic and Jurassic periods, their development was minimal and did not have great importance as reptiles were dominant in this period. So, the correct answer is A. Permian.
Describe mechanisms by which new genes could arise.
Answer:
Exon shuffling.
Explanation:
Exon shuffling may be defined as the phenomena of in which genes are exchanged between the different exons. Types of exon shuffling are transposon shuffling and cross over at the time of gamete formation.
Exon shuffling is responsible for the formation of new genes. Different exons combine together to form the new genes. The duplication of exons also leads to the formation of new genes. The intron-exons structure is altered for the new gene formation.
Thus, the correct answer is exon shuffling.
why is the inoculating loop flamed before streaking a new sections of the medium?
The inoculating loop is used as a tool to inoculate microbes on plates. So it is necessary to flame the inoculating loop to destroy any kind of microorganisms that may contaminate ou interfer the culture medium. The fire, together with ethanol, helps to sterilize the loop, allowing it to inoculate a pure culture.
ATP synthesis in mitochondria requires all of the following EXCEPT (select two answers)
a. a hydrogen ion concentration gradient across the inner mitochondrial membrane
b. the oxidation of dinucleotide molecules that act as electron carriers
c. fermentation of pyruvate into lactate to regenerate NAD+
d. the reduction O2, forming H20
e. the breakdown of glucose
Answer:
c. fermentation of pyruvate into lactate to regenerate NAD+
e. the breakdown of glucose
Explanation:
Fermentation of pyruvate into lactate to form NAD+ to drive glycolysis occurs in absence of oxygen in the cytoplasm. It does not include Kreb's cycle and oxidative phosphorylation of aerobic cellular respiration.
Aerobic respiration starts with glycolysis to split glucose into pyruvate and is followed by Kreb's cycle. Pyruvate enters Kreb's cycle in the form of acetyl CoA and is completely broken down into CO2 and H2O.
Oxidative phosphorylation is responsible for ATP synthesis in mitochondria. The dinucleotides (NADH and FADH2) formed during glycolysis and Kreb's cycle are oxidized by giving their electrons to the terminal electron acceptor oxygen molecule via electron transport chain.
The process reduces oxygen molecules into water and also generates the electrochemical gradients across the inner mitochondrial membrane to drive the ATP synthesis.
ATP synthesis requires a hydrogen ion concentration gradient across the inner mitochondrial membrane, oxidation of dinucleotide molecules, and reduction of oxygen. The breakdown of glucose and fermentation of pyruvate into lactate is not directly involved in ATP synthesis in the mitochondria.
Explanation:The synthesis of ATP (adenosine triphosphate), which is the main energy currency of the cell, within mitochondria depends on a series of biological processes including glycolysis, the citric acid cycle, and oxidative phosphorylation. However, the processes that are NOT required are 'fermentation of pyruvate into lactate to regenerate NAD⁺' (c) and 'the breakdown of glucose' (e).
ATP synthesis primarily relies on the existence of a hydrogen ion concentration gradient across the inner mitochondrial membrane (a), which is created through the electron transport chain. This process also requires the oxidation of dinucleotide molecules (which are electron carriers such as NADH or FADH₂) (b), and the reduction of oxygen, forming water (d).
The breakdown of glucose is an essential step in glycolysis, which is a preceding step to ATP synthesis inside the mitochondria but is not directly involved in ATP formation within mitochondria. Besides, the fermentation of pyruvate into lactate takes place under anaerobic conditions when the oxygen supply is low, and thus, it is not required for ATP synthesis in mitochondria.
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What is metabolism in living things?
A. The process of making energy from sunlight and using it to live.
B. The process of breathing to make energy to live.
C. The processing of metals into energy for life.
D. The process of taking in energy and using it to live.
E. The opposite of photosynthesis in plants.
Answer: Option D
Explanation:
The process in which the macro molecules breakdown in order to derive energy from them to sustain life is known as metabolism.
It includes intake of carbohydrates, fats, protein, nuclei acid and other compounds in order to break them and obtain energy for various types of cellular processes is known as metabolism.
The macro molecules breakdown to provide energy that is used for living.
Hence, the correct answer is option D
Which component is not directly involved in translation?
a. GTP
b. DNA
c. tRNA
d. ribosomes
Answer:
DNA
Explanation:
Because DNA information has already been copied in the mRNA and travels from the nucleus to ribosomes, where it works with tRNA to produce proteins. GTP is a molecule used as an energy source in the translation process.
DNA is not directly involved in the process of translation. Translation involves converting the information in mRNA into a protein, a process involving ribosomes, GTP, and tRNA, but not DNA.
Explanation:The component that is not directly involved in the process of translation is b. DNA. The process of translation involves converting the information held in mRNA, which was transcribed from the DNA, into a protein. During translation, the ribosome, GTP, and tRNA are all key players. The ribosome serves as the site where translation takes place, the GTP provides the energy for the process, and the tRNA brings the appropriate amino acid to the ribosome. However, the DNA itself does not directly participate in translation, its role is in the preceding process of transcription where it acts as a template for the synthesis of mRNA.
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Alcoholic fermentation produces (there is more than one correct answer)
a. carbon dioxide
b. oxygen
c. ATP
d. alcohol
Answer:
Alcohol, ATP and carbon dioxide.
Explanation:
Alcoholic fermentation may be defined as the conversion of sugar into the cellular energy in the absence of oxygen. This process generally occurs in yeast.
This is a type of anaerobic process that do not require oxygen for their process. The ATP is produced as a form of energy. The carbon dioxide and alcohol is obtained as the by product in the alcoholic fermentation.
Thus, the correct answer is option (a), (c) and (d).
In a short essay (100–150 words), explain how genetic information—along with an understanding of the process of descent with modification—enables scientists to reconstruct phylogenies that extend hundreds of millions of years back in time.
Answer:
Evolutionary biology illustrates both the pattern and processes. The processes of evolution are natural selection and other mechanisms, which modifies the genetic structure of the populations. These processes result in evolutionary patterns, that is, the products generated by evolution with time.
Phylogeny refers to the evolutionary history of a species or a group of species. In order to redevelop phylogeny, the scientists use systematics, that is, an analytical method to categorize the diversity and finding the evolutionary associations between the extinct and the living species.
The evidence used to redevelop phylogenies can be attained from the fossil record and from the biochemical, morphological, and genetic similarities between the species. The scientists are functioning to develop a universal tree of all life, which will get refined with the gathering of new information.
Genetic information and an understanding of descent with modification allow scientists to reconstruct phylogenies extending back millions of years.
Explanation:In order to reconstruct phylogenies that extend hundreds of millions of years back in time, scientists use genetic information and an understanding of the process of descent with modification. By comparing the nucleotide sequence of a gene across different species, scientists can determine how closely related those species are. Genetic variations among species can be used as a measure of their evolutionary relationships. For example, by comparing the gene sequences of humans and chimpanzees, scientists have determined that these two species are closely related. This genetic analysis allows scientists to construct a timeline of the evolutionary history of life on Earth, known as the 'tree of life'.
ATP synthase complex is found:
a. Thylakoid membrane of the chloroplast
b. Stroma of the chloroplast
c. Matrix of the mitochondria
d. Outer membrane of the mitochondria
Answer:
The correct answer will be option-A.
Explanation:
ATP synthase is an enzyme complex made up of two regions called F₀ and F₁ cells. The complex helps in the production of ATP molecules which provides energy to the cell.
The ATP synthase is found in the thylakoid membrane of the chloroplast and inner membrane of the mitochondria The F₀ particle is embedded in the membrane while F₁ particle faces matrix in mitochondria and stroma in the chloroplast.
Thus, option-A is the correct answer.
Fats are broken down into ________________
Describe the role of chiasmata in chromosome segregation during meiosis.
Explanation:
The phase of Prophase I of meiosis is very long and divided into 5 subphases: Leptotene, Zygote, Pachytene, Diplotene, and Diakinesis. During a phase of the Diplotene, the degree of condensation is high, which allows individualizing the sister- chromatids that remain attached by the cohesins. The synaptonemal complex disintegrates, and from the centromeres begins a repulsion between homologous chromosomes, which remain associated only with the places where they occur as permutations.
These sites are called chiasmas (Greek, crossed) because they show the crossover of homologous chromatids. Chiasmas represent the cytological finding of the occurrence of permutation. The presence of at least one bivalent chiasm is essential to ensure the correct segregation of the homologous chromosomes in anaphase I.
This bacterium causes infection of wounds and gas gangrene.
A) Clostridium perfringens
B) Enterococcus
C) Bacillus cereus
D) none of the above
Answer:
A) Clostridium perfringens
Explanation:
Gas gangrene is a type of infection caused by Clostridium perfringens and other species of clostridia. This infection happens in the muscles. The gas produced by the bacteria produces blisters in the tissues. These infections can occur after injuries, blows or surgeries
Explain how arteries, veins, and capillaries differ in form and function.
Answer:
The circulatory system of the human body consists of three types of vessels which carry blood. These blood vessels have been distinguished on the basis of structure and function and called arteries, veins and capillaries.
Structure
1. Lumen diameter: Arteries have a large diameter as compared to veins and capillaries and capillaries has the smallest diameter in all of these.
2. Wall thickness: Arteries have the thickest wall than veins and capillaries have the thinnest wall.
3. Wall layer: arteries and veins made of three layers of muscle whereas veins made of one layer of cells.
Function
1. Arteries: brings oxygenated blood (oxygen-rich) from the heart to the body parts in pulses
2. Veins: carry deoxygenated blood from the body to the heart
3. Capillaries: carry both oxygenated and deoxygenated blood away from the body.
Potentially, using the genetic code as it exists, nature could have used
63 amino acids. Why do you think it only uses 20?
Answer:
Genetic code comprises 64 codons, out of which 61 codes for 20 amino acids, while the remaining three codons do not code for any amino acids. In nature, only twenty standard amino acids prevail.
A standard amino acid is considered as an amino acid that possesses an alpha-carboxyl and alpha-amino acid, and which are found in the proteins. Though there are some of the compounds that possess alpha carboxyl and alpha-amino group but are not regarded as standard amino acids, as they do not take place in proteins like the standard one does, and these are termed as non-standard amino acids.
The frequency of these non-standard amino acids in the proteins is less and they do not comprise all the characteristics demonstrated by the standard amino acids. The genetic code is degenerative and because of this, a single amino acid is encrypted by more than one codon.
The non-standard amino acids do not exhibit the corresponding amino acids, which can code for them and they are not mediated by the t-RNA's to the location of translation, as there is no corresponding tRNAs for them. Thus, genetic code utilizes only the twenty standard amino acids.
Ethical considerations aside, if DNA-based technologies became widely used, how might they change the way evolution proceeds, as compared with the natural evolutionary mechanisms that have operated for the past 4 billion years?
Answer:
Although now a days we have evidence that evolution and speciation process can happen in 1 or just a few generations (e.g. clone crayfish or the golden rain tree bug florida and there are many more) usually evolution and speciation process work at a broader scale of time. This is important because communities are evolving together and this creates equilibrium in ecosystems. If evolution happens only in several other may not adapt to these changes.
DNA technologies can be dangerous especially with bacteria because Gram Negative Bacteria have been found to be fairly capable of inter-species conjugation, this is dangerous because DNA can change bacteria in a way that may be invasive or harmful to other organism.
DNA-based technologies could potentially alter the course of evolution in several significant ways:
1. Directed Evolution: With DNA-based technologies like gene editing (e.g., CRISPR-Cas9), humans could directly manipulate the genetic makeup of organisms, accelerating the rate of evolution. This could lead to the intentional modification of traits in plants, animals, and even humans, potentially bypassing the slow, random process of natural selection.
2. Selective Breeding: Humans have been selectively breeding plants and animals for thousands of years, but with advancements in DNA technology, this process could become more precise and efficient. Rather than relying on observable traits, scientists could select for specific genetic markers associated with desired traits, potentially leading to the rapid development of new varieties and species.
3. Gene Drives: Gene drives are genetic systems that bias inheritance in sexually reproducing organisms, allowing a particular gene variant to spread rapidly throughout a population. While this technology holds promise for combating diseases and pests, it also raises ethical concerns about its potential ecological impact and unintended consequences.
4. Synthetic Biology: DNA synthesis technologies enable scientists to design and create entirely new DNA sequences, including genes and even entire genomes. This could lead to the creation of organisms with novel traits not found in nature, potentially opening up new avenues for innovation in fields such as medicine, agriculture, and biotechnology.
5. Genetic Engineering for Environmental Adaptation: As climate change continues to alter ecosystems, DNA-based technologies could be used to help organisms adapt more quickly to changing environmental conditions. This might involve introducing genes from other species that confer tolerance to heat, drought, or other stressors.
Overall, while DNA-based technologies offer unprecedented opportunities to shape the course of evolution, they also raise profound ethical questions about the implications of playing such an active role in the genetic destiny of life on Earth. Balancing the potential benefits of these technologies with their potential risks will be a crucial challenge for scientists, policymakers, and society as a whole.
Compare the processes of oogenesis and spermatogenesis in humans.
Explanation:
Spermatogenesis and oogenesis are both forms of gametogenesis, in which a diploid gamete cell, sperm, and eggs respectively produces haploid cells through meiosis.
Oogenesis takes place in the outermost layers of ovaries, it starts with a germ cell called oogonium, this cell will go under mitosis to increase in number, it will finish this division in a developing follicle with a secondary oocyte that will complete the meiosis if fertilized.In spermatogenesis meiosis begins with a primary spermatocyte, after this meiotic division a haploid cell is produced, this will be the secondary spermatocyte, this will result in four sperm from each spermatocyte that goes through meiosis, they are in an inactive state until gonadotropic hormones activate them during adolescence.
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I added images for both processes!
In determining hematocrit, if the length of erythrocytes in the capillary tube is 45 millimiters and the length of total blood is 95, what is the hematocrit?
Answer:
47%
Explanation:
The hematocrit measures the volume of erythrocytes compared to the total blood volume. It's calculated as the ratio of the length of erythrocytes in the capillary tube to the length of total blood. It's expressed in percentage, so we have to multiply the ratio by 100%.
[tex]Hematocrit = \frac{45mm}{95mm} [/tex] x 100 %
Hematocrit = 47%
Which of the following is the measure of how fast the particles are moving in an object?
A. Boiling point
B. Freezing point
C. Evaporation
D. Temperature
The measure of particle speed in an object is the object's temperature, which reflects the average kinetic energy of the particles.
Explanation:The measure of how fast the particles are moving in an object is represented by the object's temperature. Temperature is a measure of the average kinetic energy of the particles in matter. Consequently, as the temperature of a substance increases, the particles move faster. The other options listed, such as boiling point, freezing point, and evaporation, are related concepts that describe the conditions at which a substance changes phase based on the energy of its particles, but do not directly measure particle speed.
What type of human disorders and diseases might be treatable using stem cells?
Answer:
The following disorders might be treated by using stem cell therapy:
Spinal injuries can be treated by the stem cell therapy. As the neurons can be replaced by healthy neurons and used to treat Parkinson's disease.
The insulin produced from the somatic cells are used to treat the diabetes.
The cancer can be treated by using stem cell therapy.
Any damaged organ or tissue can be replaced by the stem cell therapy.
Different genetic diseases can be cured by the use of stem cells.
If the body produces proteins naturally what happens when weconsume
more proteins?
Answer:
Body constantly break downs and repair or rebuild its own cells and tissues which is lead to the need for the protein. In under different conditions like intense physical activity or sickness or injury can also result in requirement of protein as in diet.
All these process to occur one need to consume enough protein. Excessive protein than requirement for cell or body requirement will normally metabolize to produce amino acids and energy.
Thus, the correct answer would be - it will provide essential amino acids for producing different hormones and building and repair cells and tissues and energy.
Explain generaly how Cyclin and Cyclin Dependent Kinase (CDK) work to control the cell cycle.
Answer:
Various cyclins are the regulatory proteins that associate with respective cyclin dependent kinases. The cyclin-cdk complex activate or inhibit the proteins required for specific stage of cell cycle by phosphorylation.
Explanation:
Cyclin-dependent kinases (Cdks) are the protein kinases that are involved in the regulation of the cell cycle. Cyclins are the regulatory proteins whose levels change during the cell cycle. Cyclins associate with their respective cyclin-dependent kinases to activate them. The cyclin-Cdk complex phosphorylates the enzymes and other proteins required for a particular stage of the cell cycle.
For example, the G1-cdk (the cyclin- G1 specific Cdk complex) allows the cell to enter from G1 to S phase while the G1/S-Cdk complex makes the cell to commit for DNA replication while the S-Cdk complex serves in the initiation of DNA replication. The M-Cdk complex makes the cell to enter the mitosis by phosphorylation of proteins required for various stages of mitosis. Cdks are not activated when not associated with cyclins.
When the cell is not prepared for cell division, phosphorylation of protein p27 is followed by degradation of the [proteins required for cell division. The protein p27 is one of the inhibitors of cell division.
Exercising causing ___________
a. increase LDL and HDL levels
b. increase LDL levels
c. increase HDL levels
d. decrease HDL levels
Answer:
c. increase HDL levels
Explanation:
Cholesterol is carried in blood in two ways, LDL and HDL. Both of them are lipoproteins made of fat and protein. LDL or Low Density Lipoprotein has 50% cholesterol and 25% protein by weight. HDL or High Density Lipoprotein has 20% cholesterol and 50 % protein. LDL carries cholesterol to arteries and deposits it there which is not good for the body. HDL on the other hand removes excess cholesterol from body via liver.
Aerobic exercise increases HDL values and lowers LDL values. It has been shown that exercising regularly can increase HDL level by 6% which is good for the overall health of the body. For maximum effect 30 minutes of moderate exercise should be done 5 times a week.
Exercising has a beneficial effect on blood lipid levels by increasing the levels of HDL, the 'good cholesterol'. It does not typically increase LDL levels, the 'bad cholesterol'. The correct answer to the question is 'c. Increase HDL levels'.
Explanation:Exercising has a myriad of advantages, one of which includes its beneficial effects on blood lipid levels. Understanding the terms LDL and HDL is critical here. LDL stands for Low-Density Lipoprotein, often known as 'bad cholesterol,' as elevated levels can lead to plaque accumulation in the arteries. On the other hand, HDL stands for High-Density Lipoprotein, or 'good cholesterol', which removes LDL cholesterol from the bloodstream, reducing the risk of cardiovascular diseases.
Now, when it comes to the impact of exercise on these levels, regular physical activity has been found to increase HDL levels in the blood. Hence, the correct answer would be 'c. Increase HDL levels'. Exercise typically does not lead to an increase in LDL levels.
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When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
a. The pH of the matrix increases.
b. ATP synthase pumps protons by active transport.
c. The electrons gain free energy.
d. NAD+ is oxidized.
Answer:
a. The pH of the matrix increases is the correct answer.
Explanation:
When electrons flow along the electron transport chains of mitochondria,The pH of the matrix increases because the electron transport chain is forming a gradient of hydrogen ions in respects to the matrix and the inner membrane surface of the mitochondria.
The concentration of hydrogen ion outside is higher as compared to the matrix. Thus due to higher concentration of hydrogen ions outside creates lower pH and the pH of the matrix increases.
When electrons flow along the electron transport chains of the mitochondria, the pH of the matrix increases. This is because protons are pumped out of the matrix into the intermembrane space, creating a more alkaline (high pH) environment in the matrix.
Explanation:When electrons flow along the electron transport chains of the mitochondria, a change that occurs is the increase of the pH in the matrix (option a). Here's why: The process of electron transport chain plays a crucial role in cellular respiration.
As electrons pass along the chain, protons (H+ ions) are actively pumped from the mitochondrial matrix into the intermembrane space, creating a proton gradient. The intermembrane space becomes more acidic (low pH) while the matrix becomes more alkaline (high pH). So the pH of the mitochondrial matrix increases during the process.
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Because they alter the reading frame of all base-pair triplets, base-pair additions and deletions are collectively referred to as:
a. inversions
b. transversions
c. framshift mutations
d. point mutations
e. codon mutations
Answer:
The correct answer is option c. "frameshift mutations".
Explanation:
The reading frame of a gene is based on base-pair triplets, starting from the start codon until the ribosome encounters with the end codon. Base-pair additions and deletions are collectively referred to as frameshift mutations because they alter the reading frame of the gene. Base-pair additions and deletions break down the original sequence of the gene triplets, which alters the open reading frame and usually results in the production of non active proteins.
Comparisons of amino acid sequences can shed light on the evolutionary divergence of related species. If you were comparing two living species, would you expect all proteins to show the same degree of divergence? Why or why not? Justify your answer.
Answer:
If the comparison is made between two of the living species, then all the proteins would not demonstrate a similar degree of divergence. Though the two species got diverged during the progression of evolution, they have originated from a common ancestor.
Some of the proteins taking part in very essential activities of the cell, like protein synthesis and replication would have got conserved in both the species. The modifications resulting due to mutations in the sequences of DNA, which further lead to modifications in very essential proteins may result in the loss of function of such kind of proteins. This would be harmful to the organism.
Only modifications in the proteins that are in reality benefit the organism would be encouraged at the time of divergence. Thus, the degree of divergence of all the proteins in two species will not be same.
Answer:
All proteins will show different degrees of divergence because some cellular functions are more essential than others to the survival of the organism.
All proteins will show different degrees of divergence because different species live in different habitats and experience different selection pressure.
Explanation:
This is the answer to the same question on mastering biology, but you have to select two correct statements.
The light dependent reactions of photosynthesis take energy from sunlight and convert it into stored chemical energy. Which compounds are produced in the light-dependent reactions?
A) ADP and NADP +
B) ADP and NADPH
C) ATP and NADP +
D) ATP and NADPH
Answer:
The correct answer will be option-D.
Explanation:
Photosynthesis process proceeds in two phases: light-dependent reaction and independent reaction. The light-dependent reaction is necessary as it converts the light energy to chemical energy by capturing the light photons by photosystems.
Light causes excitation of the electrons from chlorophyll which travels down electron transport chain and produces the intermediate energy equivalents mainly ATP and NADPH. These ATP and NADPH are directly utilized in the second phase of the photosynthesis which forms the glucose molecule.
Thus, option-D is the correct answer.
In the light-dependent reactions of photosynthesis, ATP and NADPH are produced, which are used in the light-independent reactions to produce sugars.
Explanation:The light-dependent reactions of photosynthesis convert light energy into chemical energy, specifically producing ATP and NADPH. These molecules provide the energy for the light-independent reactions, where sugars are synthesized. The light-dependent reactions occur in the thylakoid membranes of chloroplasts, involving two photosystems (Photosystem I and Photosystem II) which contain chlorophyll molecules that absorb light at specific wavelengths, aiding in the energy capture process.
The frequency of autosomal alleles K and k in a large population of snails is 0.6 and 0.4. What is the approximate genotypic frequency of the heterozygote Kk if the inbreeding coefficient (F) was 0.3?
a. 0.48
b. 0.34
c. 0.14
d. 0.30
e. 0.24
Answer:
Option (b).
Explanation:
The frequency of alleles K and k in population are 0.6 and 0.4. The inbreeding coefficient is 0.3.
The heterozygote frequency can be calculated by the formula:
F = [tex]\frac{2Kk-H}{2Kk}[/tex]
Here, K = 0.6, k= 0.4, F = 0.3 and H = approximate genotypic frequency of heterozygote Kk.
Put the values in the above formula
0.3 = [tex]\frac{2\times2\times0.6\times0.4-H}{2\times0.6\times0.4}[/tex]
H = 0.36 ≈ 0.34.
Thus, the approximate genotypic frequency of the heterozygote Kk is 0.34.
Hence, the correct answer is option (b).