tRNA molecules are composed of
a. DNA.
b. nucleotides.
c. amino acids
d. polypeptides.
e. lipids.
B
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The inability of a man to produce LH would result in
A. the inability of Leydig cells to produce testosterone. B. the inability of the pituitary to produce FSH. C. the loss of positive feedback control on GnRH release. D. the degeneration of the male reproductive tract. E. feminization of the testes.
Members of the supergroup Amoebozoa are characterized by:
A. locomotion via pseudopodia B. hard shells composed of calcium carbonate C. plastids acquired through tertiary endosymbiosis D. alveoli beneath the plasma membrane E. the presence of a feeding groove
The perception of a certain pitch of sound depends partly on
A. the amplitude of the sound waves. B. whether it is the round window or oval window that vibrates. C. where particles settle in the semicircular canals. D. which bones of the middle ear are moved. E. which hair cells of the cochlea are stimulated.
Which of the following substances would have the most trouble crossing a biological membrane by diffusing through the lipid bilayer?
A) O2 B) CO2 C) Na+ D) a small, nonpolar molecule such as butane (C4H10)