An organism that uses oxygen when present but can grow without oxygen is called a(n)
A. obligate aerobe.
B. facultative anaerobe.
C. microaerophile.
D. aerotolerant anaerobe.
Ans: B. facultative anaerobe.
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In class switching in the secondary antibody response, the most common antibody switch is from
A) IgA to IgD. B) IgD to IgE. C) IgM to IgG. D) None of the answers are correct.
An enzyme may lose its ability to function because of
a. excessively high temperatures. b. a change in its three-dimensional structure. c. a large change in the pH of the environment. d. all of the above.
Which condition can occur due to low production of cortisol?
a. elevated blood pressure b. decreased urine production c. elevated blood sugar d. hypoglycemia e. low blood calcium
Biodiversity is the variety of _____ on Earth.
Fill in the blank(s) with the appropriate word(s).