What does the ozone layer absorb?

a. heat
b. pollution
c. ultraviolet radiation
d. infrared radiation
e. oxygen


ANSWER: c

Biology & Microbiology

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In your own words, describe one step in the walking cycle.

What will be an ideal response?

Biology & Microbiology

Which of the following characteristics applies to both B and T cells?

a. mature in the bone marrow b. can differentiate into memory cells c. secrete proteins d. participate in acquired immunity e. involved in phagocytosis

Biology & Microbiology

Refer to Figure 49-1. Which of the following would bind to an intracellular receptor?


a. 1
b. 3
c. 6
d. 8
e. 10

Biology & Microbiology

Mitochondria arose by endosymbiosis of ______.

A. an anaerobic bacterium B. a photosynthetic bacterium C. an aerobic bacterium D. an aerobic archaeon E. a photosynthetic archaeon

Biology & Microbiology