Natural selection acts most directly on:
a. populations.
b. communities.
c. ecosystems.
d. the biosphere.
e. K-selected organisms
A
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Travelers should be vaccinated against yellow fever when traveling to Sub-Saharan Africa or South America
Indicate whether the statement is true or false.
What is the active site? a. The bottom of the substrate
b. The site on the enzyme in which the substrate attaches. c. The site on the reactant in which the enzyme attaches. d. The surface of the enzyme. e. The site on the substrate in which the enzyme attaches.
The beating of cilia and flagella occurs by means of _______-based _______.
a. dynein; microtubule sliding b. kinesin; microtubule sliding c. myosin; microfilament sliding d. tubulin; microtubule contraction e. dynein; microtubule contraction
A pseudoplasmodium is a(n)
A) group of cellular slime mold cells. B) extension of the slime mold that engulfs prey. C) aggregation of mycelia. D) disease-causing protist. E) acellular slime mold.