Due to the infections of ________ by Claviceps purpurea human history has been altered
a. milk
b. meat
c. wine
d. rye
e. tomatoes
d
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Nematodes and rotifers have a body cavity that is
(a) called a coelom. (b) called a pseudocoelom. (c) completely lined by tissues derived from mesoderm. (d) both a and c.
Endosymbiosis of cyanobacteria is widely accepted as an explanation for the development of chloroplasts. The presence of endosymbiotic cyanobacteria provided a cell with the advantage of ________.
A. a membrane-bound nucleus B. tolerance to oxygen C. an electron transport chain D. simple, rapid gene transfer E. photosynthesis
What is facilitated diffusion
What will be an ideal response?
B. F. Skinner first introduced operant conditioning experiments. What happens in these experiments?
A. An animal learns to associate its behavioral response with an instinct. B. An animal learns to associate its behavioral response with a reward or a punishment. C. An animal learns to associate its behavioral response with a fixed action pattern. D. An animal learns to associate its behavioral response with its biological clock. E. An animal learns to associate its behavioral response with a conditional stimulus.