When a Region of DNA Must Be Repaired by Removing

question 3

Multiple Choice

When a region of DNA must be repaired by removing and replacing some of the nucleotides, what ensures that the new nucleotides are in the correct sequence?

• A) DNA cannot be repaired and this explains why mutations occur.
• B) Specific enzymes bind the correct nucleotides.
• C) The new nucleotides base pair accurately with those on the complementary strand.
• D) The repair enzyme recognizes the removed nucleotide and brings in an identical one to replace it.
• E) The three-dimensional structure determines the order of nucleotides.

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