Lymphocyte receptors are encoded by genes that are assembled by rearrangement and mutation of what molecules?
A. DNA
B. pre-mRNA
C. tRNA
D. mRNA
Answer: A
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With injury, illness, anxiety, or starvation
a. cortisol levels in the blood increase dramatically. b. the adrenal medulla releases norepinephrine and epinephrine. c. the respiratory rate increases. d. the fight or flight response is activated. e. all of these occur
The word eukaryotic refers specifically to a cell containing
a. photosynthetic membranes. b. a true nucleus. c. a cell wall. d. none of the above.
Municipal water treated with chlorine compounds contains
A) no viruses. B) no bacteria at all. C) no endospores. D) no cysts. E) a decreased microbial load.
West Nile virus has the following characteristics, except
A. it causes a hemorrhagic fever. B. it causes a severe encephalitis in less than 1% of infected persons. C. it is an arbovirus. D. it is transmitted by a mosquito vector. E. it is typically a flu-like illness.