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
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Many people at a wedding ceremony represent which level of organization?
A. cell B. organ C. organism D. population E. ecosystem
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.
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
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