OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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makes DNA and RNA
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makes DNA and protein
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makes DNA and fixes its mistakes
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makes RNA and protein
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Detailed explanation-1: -DNA polymerase catalyzes the formation of new DNA strands by adding nucleotides to the existing DNA strands. This process is called DNA replication. DNA replication is necessary for the cell to divide and produce new cells. DNA polymerase also plays a role in repairing damaged DNA.
Detailed explanation-2: -DNA polymerase can make mistakes while adding nucleotides. It edits the DNA by proofreading every newly added base. Incorrect bases are removed and replaced by the correct base, and then a new base is added.
Detailed explanation-3: -DNA now has three distinct functions-genetics, immunological, and structural-that are widely disparate and variously dependent on the sugar phosphate backbone and the bases.
Detailed explanation-4: -The first is nucleotide selectivity – the ability of DNA polymerases to discriminate between correct and incorrect nucleotides during DNA synthesis. The second is proofreading – the ability of polymerase-associated exonucleases to remove incorrect nucleotides from the DNA immediately after their incorporation.