Which of the following are homologous?

A) the forelimb of a dog and the hindlimb of a cat
B) the forelimb of a dog and the forelimb of a cat
C) wings of a butterfly and wings of a sparrow
D) the mouth of a mosquito and the beak of a hummingbird


B

Biology & Microbiology

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If environmental conditions continue to favor one specific group of homozygotes over the rest of the population, then

____ selection will eventually occur. a. stabilizing b. directional c. disruptive d. abnormal e. frequency-dependent

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What mole percent of cholesterol is found in the plasma membrane of E. coli and related bacteria?

a. 0% b. 10% c. 18% d. 45%

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We can represent atoms by listing the number of protons, neutrons, and electrons—for example, 2p+, 2n0, 2e- for helium. Which of the following represents the 18O isotope of oxygen?

A) 7p+, 2n0, 9e- B) 8p+, 10n0, 8e- C) 9p+, 9n0, 9e- D) 10p+, 8n0, 9e-

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One of the major causes of the endangerment of giant pandas is ____.

A. habitat loss and fragmentation B. increasing the effects of chemical pollution C. a sexually transmitted disease that plagues the giant pandas D. introduced exotic species into giant panda habitat E. the excess withdrawal of water from their habitat

Biology & Microbiology