In what region of the world is the incidence of infection with HIV highest?
What will be an ideal response?
Sub-Saharan Africa
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We can conclude that natural selection must have acted in favor of large brains in humans because:
A. we have large brains in proportion to our body size compared to other mammals. B. large brains have allowed us to dominate the planet. C. large brains are metabolically expensive to produce and maintain. D. we would not have large brains if natural selection did not favor them. E. None of the answer options are correct.
While the gene encoding the small subunit of ribosomes was used to generate the universal tree of life,
many genes are inappropriate choices for this analysis because horizontal gene transfer has occurred for billions of years between the ancestors giving rise to all three domains. A. true B. false
Phosphodiesterase catalyzes the conversion of:
a. a protein to a phosphorylated protein. b. GDP to GTP. c. cAMP to AMP. d. IP3 to PIP2. e. calcium to calcium-calmodulm
If both chromatids of a sister-chromatid pair are found in one daughter cell, what has likely occurred?
a. improper replication of DNA b. failure of maternal and paternal chromosomes to separate c. nondisjunction during meiosis I d. nondisjunction during meiosis II e. an error during crossing-over