Which of the following receptors does not trigger depolarization of a sensory neuron?
A. Photoreceptors
B. Exteroceptors and interoceptors
C. Mechanoreceptors
D. Chemoreceptors
E. G-protein receptors
Answer: A
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Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows are autotrophic. B. cows can manufacture all 20 amino acids out of sugars in the liver. C. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose. D. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
Which external factors influence a cell to divide?
What will be an ideal response?
Which of the following generally makes skeletal muscle different from both smooth and cardiac muscle?
A) Skeletal muscles are made of cells called "fibers." B) Skeletal muscle cannot be contracted voluntarily. C) Skeletal muscle can be contracted voluntarily. D) Skeletal muscle cells have nuclei.
Why are males usually the sex with exaggerated traits used in courtship?
A. In most species, males protect their larger investment in offspring by being choosy about their mates. B. In most species, males compete for the opportunity to mate with females. C. In most species, females protect their larger investment in offspring by being choosy about their mates. D. In most species, females can afford to be choosy about their mates because of females' smaller investment in offspring.