The various classes of immunoglobulins are differentiated on the basis of their
A) asymmetry.
B) antigen specificity.
C) light-chain variable segments.
D) heavy-chain constant segments.
E) both light-chain variable segments and heavy-chain constant segments.
Answer: D
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Alzheimer's disease is characterized by all of the following except that it
A) is the most common cause of senile dementia. B) is characterized by a progressive loss of memory. C) has a clear genetic basis. D) is associated with the formation of plaques and neurofibrillary tangles. E) may be associated with damage to the nucleus basalis.
Which is an active transport process?
A. Simple diffusion B. Bulk filtration C. Osmosis D. Facilitated diffusion E. Ion pump
The hormone ANP is released from the heart and causes the urinary system to
A. increase urine volume and blood volume. B. increase urine volume and decrease blood volume. C. decrease urine volume and blood volume. D. decrease urine volume and increase blood volume.
Within the adenylate cyclase signal transduction pathways of target cells, cAMP activates
A. transcription of a mRNA. B. the receptor. C. adenylate cyclase. D. protein kinase. E. the G protein.