After a restriction enzyme cuts DNA into fragments and the fragments pair with complementary bases, the enzyme
____________________ is used to seal the gaps in the phosphate backbone. Fill in the blank(s) with the appropriate word(s).
DNA ligase
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Thyroxine is released from the thyroid gland in response to the presence of
A) ACTH. B) TSH. C) FSH. D) LH. E) GH.
Traditionally, most ecologists have assumed that community stability is a consequence of:
a. competition. b. predation. c. community complexity. d. the relative size of realized niches among species. e. disease.
NADPH is synthesized during which of the following reactions?
A) The light reactions only B) The Calvin cycle only C) Both the light reactions and the Calvin cycle D) Neither the light reactions nor the Calvin cycle
Dinoflagellates are important to coral and coral-dwelling animals because they
A) provide energy in the form of organic molecules that is used by coral animals. B) provide shelter for the fast-growing seaweeds associated with coral. C) produce carbon dioxide (CO2 ) and nitrogen for coral. D) are toxic to species that prey on reef-dwelling fish.