When the ribosome reaches a nonsense codon, which of the following occurs?
A) a methionine is incorporated
B) the polypeptide is released
C) a peptide bond forms
D) the A site binds to a charged tRNA
Ans: B) the polypeptide is released
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A study reported that high levels of phthalates in a pregnant woman could lead to ____ in their sons
a. undescended testicles b. smaller genitals c. feminized genitals d. enlarged breasts e. cancer
Heat can be generated in the brown adipose tissue of hibernating mammals due to ________.
A) increased ATP production by ATP synthase B) uncoupling by thermogenin C) a greater pH gradient across the inner mitochondrial membrane by complex IV D) insufficient NADH production during the citric acid cycle due to less active pyruvate translocase.
Food microbiology applies to
A) the use of microorganisms to make food. B) the control of microbial activity to prevent foodborne illness. C) using microbes to solve agricultural problems. D) the use of microorganisms to make food and the control microbial activity to prevent foodborne illness. E) using microbes to improve livestock and to solve agricultural problems.
A hypothetical organism has 100 traits, each of which is determined by a single locus. Each of the organism's 100 corresponding loci impacts only a single trait
Do you think that in such an organism the chance of fixing a late-acting beneficial mutation would differ from the chance of fixing an early-acting beneficial mutation? a. Yes, the strength of selection on early-acting mutations is less than the strength of selection on late-acting mutations. b. No, in the absence of pleiotropic interactions, early-acting mutations cannot have negative ef-fects on late-acting mutations. c. Yes, the mutation accumulation hypothesis and the antagonistic pleiotropy hypothesis are most likely not mutually exclusive. d. It depends on whether the mutation accumulation hypothesis or the antagonistic pleiotropy hypothesis applies to senescence in this organism.