You observe two groups of frogs that are closely related. Males from each group "sing" with a species-specific song to attract a female frog. Females only respond to songs sung by males of their species
This is an example of ______-zygotic reproductive isolation between
two species.
A. pre
B. post
A
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What is one way that genes can be predicted in genome sequences?
A) identifying the sequences most conserved between different species B) identifying the sequences least conserved between different species C) identifying the regions most conserved between individuals of the same species D) identifying regions that have undergone the most rapid evolution E) identifying sequences that have been duplicated
Which of the following is necessary for stomach enzyme activation?
a. acetylcholine b. HCl c. CCK d. GIP e. secretin
Which of the following is typical of an endocrine gland?
A. It secretes into a duct. B. It produces enzymes for digestion. C. It usually secretes its products into the circulatory system. D. It increases the metabolic rate.
Which of the following statements about stratified temperate zone lakes is NOT true?
A. Temperature gradients change from summer to winter. B. Solar radiation warms the surface layers in summer. C. Rich nutrients from the continual production of detritus accumulate near the surface of the lake. D. Populations of plankton and zooplankton depend on both sunlight and nutrient levels. E. Wind aids in the circulation of water.