Adult stem cells offer an alternative to embryonic stem cells, but they
A. do not live long enough.
B. have insufficient DNA.
C. are difficult to identify.
D. will not join easily with a vector.
Answer: C
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What will be an ideal response?
Which of the following is a pair of agents that both puncture the membranes of foreign bacteria?
A. Macrophages and helper T cells B. MAC and killer T cells C. Antibodies and killer T cells D. Antibodies and plasma cells E. MAC and plasma cells
Animal A kills animal D for food; animal C lives in animal D but does not harm D; animal B lives on the surface and sucks blood from D. The animal(s) that is/are a parasite on animal D is/are:
A. A. B. A and C. C. B. D. B and C.
From which part of a eukaryotic cell do microtubules radiate?
a. Flagellum b. Nucleus c. Centrosome d. Mitochondrion