Sickle cell anemia is caused by a defect in the
A. ability of red blood cells to fight infection.
B. chloride ion transport protein.
C. ability of the blood to clot.
D. oxygen-carrying pigment hemoglobin.
Answer: D
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Neutral mutations tend to accumulate in DNA at a predictable rate; like the ticks of a(n) __________, they can help
researchers estimate how long ago two lineages diverged. Fill in the blank(s) with the appropriate word(s).
Neurons that carry messages from sensory receptors to the CNS are
a. sensory. b. motor. c. interneurons. d. both a and b.
Seed germination is stimulated by
A) gibberellin. B) abscisic acid. C) florigen. D) ethylene. E) cytokinin.
Which of the following will yield nonexperimental data?
A. Investment performance over the last ten years of several portfolio managers B. A clinical trial for determining the efficacy of a new drug C. Crop yields from plots subject to different types of fertilizers D. None of the answers is correct.