Populations of hospital microbes contain mutations that protect them from specific antibiotics, that is, they are antibiotic resistant. The selecting agent in this situation is
A. antibiotics.
B. the patients.
C. the physicians.
D. nurses.
A. antibiotics.
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Mutations in opsin proteins in the cones will lead to ____
a. difficulty seeing at night b. colorblindness c. complete blindness d. tunnel vision e. cortical blindness
According to the MacArthur-Wilson model, the mainland harbors ____
a. a lower species richness than islands b. a species pool from which species migrate to nearby islands c. none of the same species as on nearby islands d. an easier community to study than nearby islands e. many species that are extinct on nearby islands
The greenhouse effect is a natural and important phenomenon because it
A) removes smog from affected areas. B) maintains the surface temperature on Earth. C) reverses the effect that CFCs have on the ozone layer. D) decreases the amount of carbon dioxide in the stratosphere. E) reverses the effects of deforestation.
_______________ uses uracil as a substrate.
a) DNA Polymerase III b) Peptidyl transferase c) Aminoacyl-tRNA synthase d) RNA Polymerase