Multiple sclerosis is a result of
A) demyelination of nerve cells.
B) excess myelin on nerve cells.
C) a decrease in postsynaptic receptors.
D) blocking the nodes of Ranvier.
E) proteolytic cleavage of presynaptic SNARE proteins.
Answer: A
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Specialized islet cells that secrete hormones are
found scattered throughout the a. adrenal cortex. b. liver. c. thymus. d. adrenal medulla. e. pancreas.
Which of the following prenatal maternal behaviors
has (have) long-term negative effects on the child? a. cocaine use b. smoking c. exposure to secondhand smoke d. moderate consumption of alcohol e. all of these
Which of the following statements best exemplifies the principle of selective pressures?
a. the environmental pressures felt by selection b. the environmental pressures felt by populations c. the environmental pressures felt by species d. the environmental pressures felt by organisms
Which of the following organisms has a gastrovascular cavity?
A) hydra B) earthworm C) clam D) bird