Which muscle(s) would have the greatest number of muscle cells per motor unit?
A) muscles controlling the movement of our hands
B) facial muscles
C) a thigh muscle
D) muscles controlling the movement of an eyeball
Answer: C
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All of the following traits are consistent with evolution by sexual selection EXCEPT ____
a. males are larger than females b. females actively choose superior males c. males often bear showy or defensive structures d. males gather and defend harems of females e. gametes are dispersed into the environment by wind or water
A food web is a better representation of a community than a food chain because most interactions among organisms
A) are specialized between particular individuals. B) are diffuse across a range of contexts. C) are limited to trophic levels. D) are related to phylogenetic history.
The absorption of fats differs from that of carbohydrates in that _____.
a. the processing of fats does not require any digestive enzymes, whereas the processing of carbohydrates does b. most absorbed fat first enters the lymphatic system, whereas carbohydrates directly enter the blood c. fat absorption primarily occurs in the stomach, whereas carbohydrates are absorbed from the small intestine d. carbohydrates need to be emulsified before they can be digested, whereas fats do not
Mutations in the selector genes sometimes form structures in the wrong segment, transforming the antenna of a fly into a leg, for example. What are such mutations called?
A) homologous mutations B) lethal mutations C) homeotic mutations D) silent mutations