When the effects of water-soluble hormones on their target cells are considered, the hormone itself is
A. the G protein.
B. the second messenger.
C. the first messenger.
D. the hormone-response element.
E. the phospholipase.
C
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In which structure does gestation occur?
Mucosae are generated from:
a. Ectoderm b. Mesoderm c. Endoderm d. Chorion
A lever system works at a mechanical advantage when:
A) the fulcrum is located farther from the applied force. B) the fulcrum is equally situated between the load and the force. C) the fulcrum is located closer to the applied force. D) a small load is to be moved.
Which is a function of transfer RNA (tRNA)?
A. transport mRNA out of the nucleus B. binding specifically to mRNA and nonspecifically to amino acids C. binding specifically to amino acids and nonspecifically to mRNA D. binding specifically to both mRNA and to amino acids