Estrogen has a direct effect on the
A. formation of a zygote
B. changes within the uterus
C. movement of an egg toward the sperm
D. development of a placenta within the ovary
Answer: B. changes within the uterus
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How does the loop of Henle enable the mammalian kidney to produce hypertonic urine?
I-The ascending limb of the loop actively extrudes Na+. II-The descending limb interacts with the ascending limb to raise the osmolarity of the extracellular fluid in the renal medulla. III-The concentration is further enhanced by the presence of urea, which draws water out of the collecting ducts by osmosis. A. just I B. II and III C. just III D. I and II E. I, II, and III
One similarity between DNA transposons and retrotransposons is that
A) during transposition, both go through an RNA form that is copied back into DNA. B) both can encode an enzyme required for mobilization. C) transposition results in movement of the original transposon to a different place in the genome. D) they both have poly-A segments at one end.
Some viruses are said to be naked because
A. They have a bilipid membrane instead of the capsid layer B. They have no bilipid membrane C. They have no capsid proteins D. The do not have cell wall E. None of the above
What makes neonatal herpes a very serious condition?
A) The potential for life-long infection. B) Central nervous system infection of the neonate. C) HHV infection of the bone marrow. D) Development of lymphoma. E) The potential for oncogenesis.