DNA polymerase I is thought to add nucleotides ________
A) to the 3' end of the primer
B) to the 5' end of the primer
C) in a 5' to 5' direction
D) on single-stranded templates without need for an RNA primer
E) in the place of the primer RNA after it is removed
E
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The promotion phase of carcinogenesis is enhanced by
A) prolonged or repeated exposure to foreign or natural agents that stimulate cell proliferation. B) inactivation of Ras activity. C) natural selection of cells exhibiting enhanced growth rate and invasive properties. D) a single exposure to a carcinogen. E) a single base-pair change in genomic DNA.
For most T4 phages, the nucleic acid enters the host cell but the capsid is left outside.
Answer the following statement true (T) or false (F)
Once a bacterium receives the stimulus to produce an endospore, it undergoes a conversion to a committed sporulating cell called a vegetative cell.
a. true b. false
Residual virulence is a risk factor in the use of subunit vaccines.
Answer the following statement true (T) or false (F)