A researcher has isolated a chemical released by men that reduces premenstrual nervousness and tension in women. This is an example of (a)
A. nerve growth factor.
B. insulin.
C. prostaglandin.
D. pheromone.
E. cortisol.
Answer: D
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Which of the following is (are) used by microorganisms to become resistant to a particular drug?
A. Exclusion of the drug from the cell B. Enzymatic inactivation of the drug C. An alternate metabolic pathway that bypasses the drug-sensitive step D. All of the choices are correct.
This is defined as the capacity to do work.
a. metabolism b. electrolytes c. chemical reaction d. concentration e. energy
The enzyme used by retroviruses to make a DNA copy of their RNA genome is called ________.
A. reverse transcriptase B. RNA replicase C. RNA polymerase D. DNA polymerase
All of the following are true of the SA node EXCEPT that it
A) is the pacemaker. B) is influenced by nerve impulses and hormones. C) directly stimulates the ventricles. D) directly stimulates the atria.