Evolutionary change
A. occurs through the modification of characteristics in a preexisting population.
B. may involve vertical descent with mutation.
C. may involve horizontal gene transfer.
D. All of these choices are correct.
E. None of these choices are correct.
Answer: D
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As a result of the organism going through several doubling generations of growth before inhibition, a haze of bacterial growth occurs on the agar around the disk. This phenomenon, which should be ignored, can be observed when testing which class of antibiotics?
a. Aminoglycosides b. Sulfonamides c. Penicillins d. Cephalosporins
Human skin color is an example of ____, while sickle-cell anemia is an example of ____
a. multiple alleles; epistasis b. incomplete dominance; multiple alleles c. polygenic inheritance; pleiotropy d. pleiotropy; polygenic inheritance e. incomplete dominance; pleiotropy
In humans, oxygen is delivered to the cells of the body by ________
A) a closed circulatory system B) an open circulatory system C) diffusion D) diffusion and facilitated diffusion
Which one of the following is a characteristic of open circulatory systems but NOT closed circulatory systems?
A) a heart B) a vascular system C) blood D) open-ended blood vessels