Plasma approximately makes up what percent of the total blood volume?
a. 10 percent
b. 25 percent
c. 50 percent
d. 75 percent
e. 90 percent
C
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In nature, bacteria
A. often grow in close association with many other kinds of organisms. B. may remain in a prolonged exponential phase. C. frequently synthesize structures such as slime layers. D. may adhere to surfaces by means of pili and slime layers. E. All of the choices are correct.
A virus is most analogous to a(an) ____
a. bank robber b. carjacker c. embezzler d. attack dog e. drug dealer
cIn the spiral staircase model of DNA, the handrails
are a. covalent bonds. b. hydrogen bonds. c. nucleotide base pairs. d. phosphate and deoxyribose groups. e. composed of all of these.
The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior affects ________
A) the direct fitness of the caller B) the indirect fitness of the caller C) both the direct and indirect fitness of the caller D) neither the direct nor indirect fitness of the caller