Plasma cells come from
a. T cells.
b. dendritic cells.
c. B cells.
d. macrophages.
e. monocytes.
C
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Which of the following statements is NOT a correct description of an advantage that seeds have over spores?
A. Seeds can remain dormant and survive unfavorable conditions. B. Seeds are produced in greater numbers than spores. C. Seeds are tougher and can resist abrasion better than spores. D. Seeds are more resistant to pathogens. E. Production of seeds does not require water as a medium for sperm transport.
The nitrogenous bases adenine and thymine are
A) both purines. B) both pyrimidines. C) a purine and a pyrimidine, respectively. D) a pyrimidine and a purine, respectively.
What does the ozone layer absorb?
a. heat b. pollution c. ultraviolet radiation d. infrared radiation e. oxygen
Which of the following is used in both food production and industrial fermentation?
A) Bacillus thuringiensis B) Escherichia coli C) Listeria monocytogenes D) Pseudomonas syringae E) Saccharomyces cerevisiae