In the genotype Aabb,
A. A is a dominant allele.
B. a and b are alleles of each other.
C. A and b are at the same locus.
D. A and a are dominant genes.
A. A is a dominant allele.
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An allosteric enzyme most clearly displays positive cooperativity when:
A. Km= K0.5. B. an increase in substrate increases the rate of reaction. C. a decrease in substrate concentration is observed soon after initiating the reaction. D. a minimal increase in modulator is associated with a large increase in V0. E. a minimal decrease in modulator is associated with a large increase in V0.
What is the role of Rad51 in eukaryotic recombination events?
A. It introduces single-strand breaks in the chromosome. B. It degrades the 5'-ending strand to create 3'-ending single-strand overhangs. C. It is a helicase that assists in separating the DNA strands at the site of breakage. D. It is a single-strand DNA binding protein that coats the 3'-ending single-strand overhang. E. It is a RecA-class recombinase that mediates strand invasion.
Studies of gene mutation frequencies have shown that __________
A) mutations are rare, and genomes are generally stable B) mutation frequencies differ among organisms and also between genes, suggesting certain genes are more susceptible to mutation C) mutation frequencies are consistent between organisms, and each region of DNA is equally susceptible to random mutations D) Both A and B are correct E) Both A and C are correct
Through which process do bacteria recycle nutrients in the environment?
A) Decomposition B) Photosynthesis C) Conjugation D) Binary fission E) Endospore formation