The primitive atmosphere of Earth may have favored the abiotic synthesis of organic molecules because it __________.
a. was highly oxidative
b. had a great deal of methane and organic fuels
c. had plenty of water vapor, carbon, oxygen, and nitrogen, providing the C, H, O, and N needed for organic molecules
d. consisted almost entirely of hydrogen gas, creating a very reducing environment
e. was reducing
Answer: e. was reducing
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In animals, a sphere of embryonic cells surrounding a fluid-filled cavity is called a
A. coelom. B. blastula. C. gastrula. D. hydrostatic skeleton. E. gastrovascular cavity
Which one of these substances would NOT be produced at the same time as coagulase?
A) fimbriae B) hemolysin C) capsules D) fibrinolysin
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A. myofibrils B. actin C. motor neurons D. myosin E. Z lines