The most important chemical group that determines how tightly histones bind DNA is
A) acetyl.
B) methyl.
C) ethyl.
D) phosphate.
A) acetyl.
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The SOS system repairs DNA that has gaps, breaks, and other lesions by
A) cutting DNA from other parts of the genome and pasting it into the gaps or damaged areas. B) stabilizing single-stranded DNA until the next round of normal replication. C) using specialized DNA polymerases that will synthesize a new DNA strand even if there is not a normal complementary DNA strand to act as a template. D) using available mRNA and a special RNA-dependent DNA polymerase to fill in the gaps and replace damaged DNA.
Which of the following is a plant behavior that is influenced by light?
A. solar tracking B. phototropism C. flowering D. seed germination E. All of the choices are true
If you were stranded in the Sahara Desert with very little water, you would likely die as a result of
a. dehydration. b. hyperthermia. c. hypothermia. d. dehydration and hyperthermia. e. dehydration. hyperthermia and hypothermia.
Target cells
a. are found only in specific endocrine glands. b. are equipped with specific receptor molecules. c. are never muscle cells. d. may occur in any part of the body. e. are equipped with specific receptor molecules and may occur in any part of the body