Gene regulation may entail
A. turning on genes only when needed.
B. turning off genes when not needed.
C. turning on or off entire groups of genes.
D. All of the choices are correct.
D
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Which repair mechanism often leads to deletions in chromosomes?
A. Recombinational repair B. Direct repair C. Base excision repair D. Mismatch repair E. Nucleotide excision repair F. Nonhomologous end joining (NHEJ)
Which of the following statements DOES NOT characterize decomposers?
A. They feed on nonliving organic matter. B. They play an important role in nutrient cycling. C. They break down wastes. D. They release nutrients that other organisms can use. E. They synthesize organic molecules.
The correct sequence of the following events is
a. fertilization, germination, pollination. b. germination, pollination, fertilization. c. pollination, fertilization, germination. d. pollination, germination, fertilization
Which of the following is NOT true of ciliates?
a. they have no cell wall b. some are autotrophs c. most live in seawater or fresh water d. some live in mammalian guts e. one species is a human pathogen