Behavioral traits are useful in differentiating species because behaviors ____
a. are never genetically determined
b. related to mating may create prezygotic isolation
c. of fossilized specimens are easy to infer
d. are independent of morphological characteristics
e. are always learned
ANSWER: b
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Mitosis results in ________ chromosome number, whereas meiosis results in ________ chromosome number.
A) a doubling of; no change in B) no change in; no change in C) a reduction by half in; no change in D) no change in; a doubling of E) no change in; a reduction by half in
The main force that moves blood throughout the system of blood vessels is
a. arterial blood pressure. b. skeletal muscle action. c. smooth muscle action. d. valve action. e. venous blood pressure.
When the photosynthetic organisms evolved the ability to split water, they produced _____ as a waste material, which was poisonous to most of the cells then alive
a. hydrogen gas b. hydrogen sulfide c. water d. carbon dioxide e. oxygen
Which of the following statements describes proteobacteria?
a. Gram-negative and includes the purple bacteria b. Gram-negative and includes the green bacteria c. Gram-positive and includes the purple bacteria d. Gram-positive and includes the green bacteria e. Gran-neutral and includes the green bacteria