The genetic code uses ________ nucleotide(s) to specify one amino acid.
A. 64
B. two
C. four
D. one
E. three
Answer: E
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Competitive release is most likely to occur when a
A) species colonizes an island that already has potential competitors. B) species moves into new habitats that it never occupied on a mainland. C) species decreases in abundance. D) competing species is added to a community.
The only cytoplasmic organelles in animal cells aside from nuclei that contain DNA are ____________________. Fill in the blank(s) with the appropriate word(s)
Which of the following statements regarding enzymes is FALSE?
A) Enzymes are proteins that function as biological catalysts. B) Enzymes are highly specific for the molecules to which they attach. C) The activity of enzymes can be regulated by factors in their environment. D) Enzymes provide energy for the reactions they catalyze. E) An enzyme may be used many times for the same specific reaction.
A disease that destroys the adrenal cortex should lead to an increase in the plasma levels of _____
A) glucocorticoid hormones B) epinephrine C) adrenocorticotropic hormone (ACTH) D) acetylcholine