Adenine methylase is an enzyme used during mismatch repair MMR).It helps determine which strand needs to be repaired by discriminating between template and new DNA strand.If this enzyme is mutated,how would MMR be affected?
A)MMR would not be hindered because adenine methylase is not directly involved in MMR. B)MMR would be hindered because both strands would be unmethylated and both would appear as template DNA strands. C)MMR would be hindered because both strands would be overmethylated and both would appear as template DNA strands and it would not be possible to determine which strand has the mutation. D)MMR would be hindered because both strands would be unmethylated and both would appear as new DNA strands and it would not be able to determine which strand has the error. E)MMR would be hindered because both strands would be overmethylated and both would appear as new DNA strands and it would not be able to determine which strand has the error.
In bacteria and eukaryotes,a mutation is when__________ .
A)DNA is unable to be replicated B)the expression of a gene changes without the DNA sequence being changed C)the amino acid sequence in a protein molecule is directly changed D)the nucleotide sequence in a DNA molecule is directly changed E)the nucleotide sequence in an mRNA molecule is directly changed
A)are known to cause insertion or deletion mutations B)can cause missense mutations due to mispairings C)are likely to cause frameshifts D)allow purines to bind to purines E)allow pyrimidines to bind to pyrimidines