What do we call a lymphocyte that has never encountered an antigen?
A. Stem leukocyte
B. Foreign lymphocyte
C. T cell
D. B cell
E. Naive lymphocyte
Answer: E
Biology & Microbiology
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A microbe growing in a refrigerator is likely
A) psychrophilic. B) mesophilic. C) psychrotolerant or psychrophilic. D) hyperthermophilic.
Biology & Microbiology
The primary reason for climatic differences from one
part of the world to another is a. differences in atmospheric pressures. b. differential absorption of solar energy. c. prevailing wind currents. d. differences in humidity. e. variation in cloud cover.
Biology & Microbiology
The carbon reactions of photosynthesis can occur in the day or night.
a. true b. false
Biology & Microbiology
Plants readily take up nitrogen from atmosphere.
A. true B. false
Biology & Microbiology