In some repair mechanisms,the parental DNA strand is used as a guide for repairing mistakes made in the newly synthesized DNA strand.The cell is able to distinguish the parental strand from the new strand because immediately following replication,the DNA isـــــــــــــــــــ .
A) fully methylated
B) still single-stranded
C) hemi-methylated
D) non-methylated
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Q1: Nonsense mutations occur whenـــــــــــــــــ is introduced into
Q3: A mutation that changes the orientation of
Q4: DNA polymerases often proofread their recently inserted
Q5: Aـــــــــــــــــــــــ mutation has no effect on phenotype.
A)frameshift
B)deletion
C)silent
D)nonsense
Q6: Spontaneous mutations occurــــــــــــــــــــــــ .
A)from errors in replication
B)when
Q7: Which of the following is notorious for
Q8: Mutations occur more frequently in hotspots.
Q9: Terotogenic agentsـــــــــــــ ـــــــ .
A)generate reversions
B)always causes mutations
C)are always
Q10: A ــــــــــــــــــــــmutation changes the coding sequence of
Q11: When second site mutations change the mutant
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