The main driving force behind protein folding is:
A. hydrogen bonds.
B. disulfide bonds.
C. van der Waals forces.
D. length of polypeptide.
E. rate of translation.
The adenylation of DNA ligase is:
A. an unstable initial step in the reaction.
B. occurs at a lysine residue in the DNA binding domain.
C. dependent on the presence of DNA.
D. independent of the presence of DNA.
E. more efficient at lower pH.
Synteny can be described as the:
A. degree of conservation between sequences.
B. evolution of orthologs.
C. evolution of paralogs.
D. conserved gene order between two organisms.
E. conserved number of chromosomes between two organisms.
Each replication fork requires both leading and lagging strand synthesis because
A. DNA synthesis must be complementary.
B. DNA polymerases can only synthesize DNA 3' to 5'.
C. the DNA templates are antiparallel and yet the DNA polymerases only work in one direction.
D. the helicase unwinds one strand faster than the other.
E. All of these choices are correct.
The immunoglobulin superfamily includes a wide variety of soluble and cell-bound proteins important in the immune response. These proteins can be best described as sharing:
A. a nearly identical primary structure.
B. a nearly identical primary structure, and similar structural motifs and function.
C. limited to close sequence similarity, and similar structural motifs and function.
D. none to limited sequence similarity, and similar structural motifs and function.
E. limited to close DNA-coding sequences, and similar structural motifs and function.
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