Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A or B.
A)Damaged DNA must be identified by DNA repair proteins
B)The sequence of nucelotides in the damaged DNA sequence must guide the synthesis of the correct DNA sequence
C)Entire strands of damaged Dna must be destroyed by DNA eating enzymes within the nucleus.
Can someone else help me then because this is due tommorow and I need to know the answer is right.
Specific topic might attract a teacher who knows.
To determine which answer choice is correct, let's analyze each option:
A) Damaged DNA must be identified by DNA repair proteins: This statement is accurate and essential for repairing a mismatch error. DNA repair proteins play a crucial role in recognizing damaged or incorrectly paired nucleotides and initiating the repair process.
B) The sequence of nucleotides in the damaged DNA sequence must guide the synthesis of the correct DNA sequence: This statement is also correct. During DNA repair, the damaged DNA sequence serves as a template to guide the synthesis of the correct complementary nucleotides by DNA polymerase. This process helps restore the sequence integrity and repair the mismatch error.
C) Entire strands of damaged DNA must be destroyed by DNA-eating enzymes within the nucleus: This statement is incorrect. While DNA-eating enzymes, such as nucleases, exist within the cell, their function is not to destroy entire strands of damaged DNA during mismatch repair. Instead, they may be involved in other processes such as DNA degradation or elimination of specific DNA fragments.
Based on this analysis, the correct answer is indeed a combination of answers A and B. Both steps are necessary for repairing a mismatch error: identification of the damaged DNA by repair proteins and the synthesis of the correct DNA sequence based on the original template.
Therefore, the best answer is A) Damaged DNA must be identified by DNA repair proteins, and B) The sequence of nucleotides in the damaged DNA sequence must guide the synthesis of the correct DNA sequence.