CELL DIVISION
THE CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following steps is not a part of correcting errors in newly replicated DNA?
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DNA ligase bonds the correct DNA pieces together
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The incorrect base pairs are recognized and removed
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The entire DNA strand is disassembled, and the process starts over.
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DNA polymerase fills in the deleted DNA sequence
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Explanation:
Detailed explanation-1: -Three types of excision repair-base-excision repair, nucleotide-excision repair, and mismatch repair-enable cells to cope with a variety of different kinds of DNA damage.
Detailed explanation-2: -Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment.
Detailed explanation-3: -In rare cases, mistakes are not corrected, leading to mutations; in other cases, repair enzymes are themselves mutated or defective. Most of the mistakes during DNA replication are promptly corrected by DNA polymerase by proofreading the base that has been just added (Figure 14.6.
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