The jugular veins drain blood from the ____
a. heart
b. lungs
c. liver
d. brain
e. arms
ANSWER: d
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Which pair of traits is homologous?
a. butterfly wings and bat wings b. the surfaces of bird and bat wings c. the skeletons of bird and bat wings d. butterfly wings and bird wings e. bird wings and bat wings
Early in mitosis chromatin condenses into the compact, rodlike structures known as chromosomes
Which of the following processes takes place more easily as a result?
a. disappearance of the nuclear envelope b. replication of DNA c. orderly distribution of DNA into the two new nuclei d. formation of the mitotic spindle e. disintegration of nucleoli
Four of the five answers are reasons that Africanized honeybees are more dangerous than European honeybees. Select the exception
a. Africanized honeybees have more potent venom. b. Africanized honeybees attack in larger numbers. c. Africanized honeybees sting with less provocation. d. Africanized honeybees pursue with more persistence. e. Africanized honeybees lack a high threat threshold.
In the example of the flicker hybrid zone, why does it appear that the flicker hybrids are in a stable hybrid zone?
a. The two kinds of flickers are reproductively isolated from one another. b. The two kinds of flickers have evolved completely into one distinct group. c. The two kinds of flickers have shown some reinforcement and thus the hybrids are beginning to disappear. d. The two kinds of flickers have out-competed their parental populations and exist as an entirely new species. e. The two kinds of flickers do not show reinforcement, nor have fused into one distinct group and their hybrid zone has not expanded.