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