Which term describes infections that produce escalating symptoms over a short period of time, until the virus is eliminated from the body by the immune system?
a. asymptomatic infection
b. chronic infection
c. acute disease
d. intermittent disease
c. acute disease
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Mendel found that pea plants expressing a recessive
trait a. were pure-breeding. b. appeared only in the first generation of a cross between two pure-breeding plants expressing contrasting forms of a trait. c. disappeared after the second generation. d. could be produced only if one of the parents expressed the recessive trait. e. were none of these.
In the classic study by Weingarten, the rats ________ each time the buzzer and light were presented during the test phase.
(a) exhibited conditioned fear (b) ate (c) avoided the food (d) vomited
Plant roots increase the soil's capacity to hold water, so vegetation contributes to erosion and flood control
Indicate whether the statement is true or false
What process best characterizes Ca2+ movement from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration)?
A. Calcium movement occurs by passive diffusion. B. Calcium movement is spontaneous. C. Calcium movement occurs by facilitated diffusion using a transporter protein. D. Calcium movement involves active transport. E. Calcium movement does not require energy.