In his experiments, Anfinsen treated a protein with a chemical that broke disulfide bonds and then removed the
chemical to see how this would affect the function of the molecule. What did he conclude from these experiments?
a. The information for determining the three-dimensional shape of ribonuclease lies in its amino acid sequence.
b. The disulfide bonds are essential for quaternary, but not tertiary, protein structure.
c. Protein conformation is maintained when disulfide bonds are disrupted.
d. Altering the three-dimensional shape of the protein is irreversible.
e. Disulfide bonds are unnecessary for proper protein function.
ANSWER: a
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The primary purpose(s) of viral cultivation is/are to
A. prepare viruses for vaccines. B. isolate and identify viruses in clinical specimens. C. do detailed research on viral structure, lifestyle, genetics, and effects on host cells. D. perform wide-scale harvesting of viruses. E. All of the choices are correct.
Energy requiring metabolic pathways that yield complex molecules from simpler precursors are:
A) amphibolic. B) anabolic. C) autotrophic. D) catabolic. E) heterotrophic
Genomes of species in both Bacteria and Archaea show a strong correlation between genome size and
A) noncoding RNA. B) codon bias. C) number of ORFs. D) number of introns.
Is a ribozyme a true enzyme?
a. Yes, because it is a catalyst. b. No, because it is not a protein. c. No, because it cannot catalyze a reaction. d. Yes, because it can synthesize a protein. e. No, because it doesn't require cofactors.