All of the following are types of light microscopes EXCEPT
A) fluorescent.
B) confocal.
C) phase-contrast.
D) scanning tunneling.
E) bright-field.
D
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Diffusion is an effective way to exchange gases over short distances, but not over large distances
A. true B. false
When might unrelated individuals engage in apparently altruistic acts?
A. If they are trying to mate with each other. B. If they are unselfish individuals. C. If the altruism is likely to be reciprocated. D. If the act benefits their population. E. Unrelated individuals never perform apparently altruistic acts.
The main force that moves blood throughout the system of blood vessels is ____
a. arterial blood pressure b. skeletal muscle action c. smooth muscle action d. valve action e. venous blood pressure
A cell that is 98% water is placed in pure water. This cell will
A. shrink. B. swell. C. shrink and then swell. D. remain the same size.