For each glucose molecule that enters glycolysis, how many times does the Krebs cycle turn?

A. One
B. Two
C. Three
D. Four


Answer: B. Two

Biology & Microbiology

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Light enters the eye's interior through the __________, an adjustable opening in the center of the

muscular, doughnut-shaped iris. Fill in the blank(s) with the appropriate word(s).

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Archaeal sulfate reducers use elemental sulfur as an electron acceptor.

Answer the following statement true (T) or false (F)

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Modern invertebrates first appear in the fossil record during the

A) Cambrian period. B) Silurian period. C) Precambrian era. D) cyanobacteria. E) Devonian period.

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In a transmission electron microscope, the "lenses" are

A) made of glass. B) thin films of metal. C) lasers. D) magnets. E) vacuums.

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