Which of the following would not be a possible cause of sickling of red blood cells in someone with sickle-cell anemia?
A) malaria
B) vigorous exercise
C) prolonged exposure to cold
D) travel at high altitude
C
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Each triplet of bases in a gene corresponds to
A) one amino acid in a protein. B) one DNA nucleotide. C) one protein. D) one mRNA. E) one chromosome.
In a feedback loop, the portion that brings the variable back to its normal value is the
A) Effector. B) Set point. C) Integrating center. D) Sensor.
The rate of conduction of a nerve impulse depends upon
A) the number of cell dendrites. B) properties of the soma of the neuron. C) the presence or absence of a myelin sheath. D) the type of neurotransmitter present. E) All of the answers are correct.
One of the enzymes that shuts off a hormone's stimulatory effect is
a. acetylcholinesterase. b. phospholipase. c. cyclooxygenase. d. adenylate cyclase. e. phosphodiesterase.