Which cell plays a central role in all adaptive immune responses?
A. Dendritic cell
B. Mast cell
C. Basophils
D. NK cell
E. T cell
Answer: E
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A marine biologist is conducting research on animals that have a lophophore and two calcified shells. Based on this information, this animal must belong to the phylum
A. Mollusca. B. Phoronida. C. Ectoprocta. D. Bryopoda. E. Brachiopoda.
Independent assortment predicts a 9:3:3:1 ratio with four different phenotypes in the F2 progeny. If the alleles are epistatic, what would you predict?
A) more than four phenotypes B) fewer than four phenotypes C) heterozygotes with a novel phenotype between the dominant and recessive homozygotes D) 1/3 of the progeny with the dominant phenotypes and 2/3 recessive E) no change in the 9:3:3:1 ratio
In comparing mitosis and meiosis, which statement is true?
A. Meiosis I is more like mitosis than is meiosis II. B. Both processes result in four cells. C. Crossing over of homologues occurs in both. D. Chromatids are present only in mitosis. E. Meiosis II resembles mitosis.
A 6.85 kb EcoRI fragment of DNA is shown below. The location of several restriction sites is indicated. Scale is approximate.
If you were to completely digest this fragment of DNA with PstI, how many pieces of DNA would you obtain?
A. 1 B. 2 C. 3 D. 4