Humans have a gene called PDHA1, which codes for one protein that functions as an enzyme in the cell. It helps energy pathways by modifying pyruvate molecules into acetyl CoA molecules. Researchers have identified an insertion mutation in the gene, which produces an extra amino acid within the otherwise normal sequence in the protein. In this type of mutation
A. the mutation is not in DNA, but in the protein.
B. the codon that mutates causes a stop codon to occur instead of the placement of an amino acid.
C. the codon that mutates causes a change in the amino acid specified.
D. the mutation does not occur in an existing codon.
E. the mutation may be caused by an addition of three nucleotides.
E. the mutation may be caused by an addition of three nucleotides.
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Sex differences in body growth are mediated by changes in growth hormone, insulin-like growth factor I and
A. thyroid hormone. B. estradiol and testosterone. C. prolactin. D. progesterone. E. cortisol.
Antiestrogens can bind to estrogen receptor sites
a. without activation. b. without inhibition. c. and amplify the response. d. and prevent reception of hormone action. e. and increase growth of tumors.
In a food chain consisting of four trophic levels, if the energy present in the top level is 48 kcal/m2/yr, how much energy do you expect in herbivores? (Use an energy transfer rate of 10%.)
A. 4.8 kcal/m2/yr B. 48 kcal/m2/yr C. 480 kcal/m2/yr D. 4,800 kcal/m2/yr E. 48,000 kcal/m2/yr Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about energy flow? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following is dependent on the ability of water molecules to form hydrogen bonds with other molecules besides water?
A) the evaporative cooling of skin surfaces B) the milder temperatures of coastal regions compared to inland areas C) the ability of certain insects to walk on the surface of water D) the universality of water as a solvent