How does a prokaryotic cell differ from a eukaryotic cell?

a. A prokaryotic cell has no membrane-enclosed organelles.
b. A prokaryotic cell has a plasma membrane.
c. A prokaryotic cell contains organelles.
d. A prokaryotic cell has a nucleus.
e. A prokaryotic cell has DNA


a

Biology & Microbiology

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In step 4 of the citric acid cycle, the reduction of NAD+ to NADH is coupled to the generation of CO2 and the formation of a high-energy thioester bond. Which molecule provides the sulfhydryl group necessary to form the thioester bond?

(a) pyruvate (b) acetyl CoA (c) CoA (d) cysteine side chain in the catalytic pocket

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The exoskeleton of arthropods

a. grows with the animal. b. is not waterproof. c. contains chitin. d. is important for the animal's digestion. e. has no functional use.

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In sexual reproduction in multicellular organisms, produces haploid gametes, and unites the gametes to create diploid zygotes.

A. meiosis; fertilization B. mitosis; pollination C. fertilization; meiosis D. pollination; fertilization E. fertilization; mitosis

Biology & Microbiology