In humans and some primates, which category of neurons is composed of the greatest number of cells?
a. efferent neurons
b. afferent neurons
c. interneurons
d. motor neurons
e. sensory neurons
C
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What is the role of the villi?
A. To secrete digestive enzymes into the digestive tract B. To secrete water into the digestive tract C. To absorb small nutrient molecules from the digestive tract D. To move food along the digestive tract
Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?
A. carrier B. cytoskeletal C. structural D. targeted
A prolonged, relatively mild period with ample precipitation alternates with a cold period when plants become dormant
(A) deciduous forest (B) Tropical rain forest (C) Desert (D) Tundra (E) Taiga
Ivan Pavlov is most closely associated with
A) breeding experiments with pigeons. B) operant conditioning (trial-and-error learning). C) insight learning. D) classical conditioning with dogs. E) imprinting experiments with ducks.