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
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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
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%
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-
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