Refer to Figure 40.12 in your text. If you found a mammal skull that had large, pointed canines and relatively narrow, blade-shaped molars and pre-molars, you could infer that it came from an animal specialized for feeding on:
A. primarily meat.
B. primarily tough plant material.
C. primarily soft plant material, such as fruit.
D. a combination of meat and tough plant
material.
E. a combination of meat, soft plant material
such as fruit, and tough plant material.
A
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The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of:
A. fatty acids. B. steroids. C. nucleotides. D. amino acids. E. water molecules.
Endocrine cells in the pancreas are responsible for which of the following?
a. Regulating blood-glucose levels b. Stimulating metabolism c. Promoting the growth of body tissues d. Stimulating water reabsorption by the kidneys
Why can evolution in mosquitoes be more easily observed than evolution in a population of squirrels?
A) Mosquitoes have a shorter generation time. B) Mosquitoes have a higher mutation rate. C) Mosquitoes feed only on blood. D) Mosquitoes lay eggs rather than bear live young.
All of the following involve active transport across membranes except
A) the movement of mineral nutrients from the apoplast to the symplast. B) the movement of sugar from mesophyll cells into sieve-tube elements. C) the movement of sugar from one sieve-tube element to the next. D) the movement of K+ across guard cell membranes during stomatal opening. E) the movement of mineral nutrients into cells of the root cortex.