How were researchers able to determine whether hemimethylation inhibited replication or if initiation required full methylation of the Dam target sites in E. coli?
What will be an ideal response?
Ans: By testing whether a fully unmethylated origin could initiate replication, researchers were able to conclude that a fully methylated origin was not required. This result suggested that hemimethylation had an inhibitory effect on initiation.
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A new drug is found to act by blocking the incorporation of subunits into sterol molecules for the cell membrane. Which statement is true?
A. Most bacteria would be unaffected by this drug. B. Only archaeal cells would be affected by this drug. C. This kind of drug would destroy viruses only. D. Only biofilms would be affected by this drug. E. A drug with this mechanism would be an excellent antibiotic.
Which of the following human extraembryonic
membranes forms the urinary bladder? a. amnion b. yolk sac c. chorion d. allantois e. none of these
During which stage or phase of the cell cycle does the cell replicate its chromosomes?
A) M phase B) G1 C) G2 D) S E) G0
Short hair (L) is dominant to long hair (l). IS a short-haired animal of unknown genotype is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, the results would indicate that
a) the short-haired animal was homozygous. b) the long-haired animal was heterozygous. c) the short-haired animal was heterozygous. d) both the long-haired and short-haired animals were heterozygous.