Most of the ultraviolet radiation reaching the upper atmosphere is absorbed by

A. CFCs.
B. water vapor.
C. ozone.
D. carbon dioxide.
E. nitrogen.


Answer: C

Biology & Microbiology

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Which of the following cell components is not directly involved in synthesis or secretion?

a. ribosome b. rough endoplasmic reticulum c. Golgi body d. smooth endoplasmic reticulum e. lysosome

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Most of the fresh water in the world is used for

A. drinking. B. bathing. C. industrial needs. D. watering lawns. E. irrigation.

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In this figure, which of the following are composed primarily of proteins?

a. A and B b. B and C c. B and D d. A and D

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