Lipid-soluble hormones, such as progesterone, exert their effects by forming hormone-receptor complexes that
A. activate a G protein and second-messenger cascade.
B. activate adenylate cyclase.
C. open ion channels in the cell membrane.
D. bind to DNA and initiate transcription.
Answer: D
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What is the role of vitamin C in bone growth?
A. It is necessary for the absorption of calcium by the digestive system. B. It stimulates osteoblast activity. C. It promotes the cross-linking of collagen molecules in bone. D. It promotes synthesis of the glycosaminoglycans (GAGs) of the bone matrix. E. It promotes proliferation of cartilage at the epiphyseal plates.
What changes occur during vigorous exercise regarding breathing?
What will be an ideal response?
Sensitization during hemolytic disease of the newborn refers to
A) the fetal immune system producing antibodies against the mother's RBCs. B) the fetal immune system producing antibodies against the fetus' RBCs. C) the mother's immune system producing antibodies against the fetus' RBCs. D) the mother's immune system producing antibodies against the mother's RBCs. E) spontaneous miscarriage of a woman's first baby due to blood incompatibilities.
The posterior part of the vertebral arch is the
A. intervertebral disk. B. vertebral foramen. C. lamina. D. intervertebral foramen. E. spinous process.