Cell-mediated immunity is directed by:
a. B cells, which secrete antibodies.
b. T cells, which secrete antibodies.
c. macrophages, which produce histamines.
d. B cells, which react with APCs.
e. T cells, which react with APCs
e
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What type of noncoding DNA comprises the largest portion of multicellular eukaryotic genomes?
a) introns b) pseudogenes c) transposons d) gene regulatory sequences e) centromeric sequences
Suppose you are studying photosynthesis in a research lab. You grow your plants in a chamber with a source of water that has a radioactively labeled oxygen atom. What photosynthetic product will be radioactive?
A) NADPH B) CO2 gas C) ATP D) Glucose E) O2 gas
Which phase of mitosis involves the shortening of the microtubules as the chromosomes move toward the poles?
A) Anaphase B) Prophase C) Metaphase D) Telophase
What are attributes of oral contraceptives? (Check all that apply.)A) They contain a progesterone and sometimes an estrogen analogue.B) The progesterone is in the 21-day pills, and the estrogen is in the 7-day pills.C) They help protect against ovarian and endometrial cancer.D) They are appropriate for use by smokers over age 35.E) They have a low failure rate of only 1% to 5% a year.F) They act by inhibiting LH and FSH secretion, inhibiting ovulation.
What will be an ideal response?