DNA polymerase III builds new DNA strands in the 5' to 3' direction...always adding the new...

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Biology

DNA polymerase III builds new DNA strands in the 5' to 3'direction...always adding the new nucleotide to the 3' end of theexisting strand. As it adds new nucleotides, it proofreads itswork. If a mistake is detected, DNA polymerase will act as anexonuclease and excise the incorrect nucleotide. A. What suppliesthe energy needed to add the new nucleotide to the existing chain?B. Please explain why evolution has favored 5â€™ to 3â€™ polymerases,as opposed to 3â€™ to 5â€™ ones (hint...what happens if DNA Polymeraseremoves a nucleotide?).

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3.7 Ratings (542 Votes)

A answer The energy needed to add the new nucleotide to the existing chain during replication is supplied by nucleoside triphosphates ATP GTP TTP and CTP which is high energy molecule like ATP Nucleotide triphosphates serves both as a souce of energy and See Answer

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