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Chapter 25: Q21CP (page 915)

What are the functions of DNA phtolyases and alkytransfarses?

Short Answer

Expert verified

The enzymes Photolyase and alkytranferases are the phylogenetically old enzymes which is present and junctional in many species.

Step by step solution

01

Step-1: Photolyase Reactivity 

DNA photolyase are the photo reactivating enzymes that convert light energy to chemical energy to break the cyclo-butane ring in the pyrimidine dimers of the DNA.

02

Step-2: Alkytranferases Effect 

Thus, these enzymes prevent the lethal remutagenic effect of UV repair of DNA. Alkytranferases are the widely distributed unique DNA repair protein that acts as a single agent to directly remove alkyl group of gualine is restoring DNA.

Hence, DNA photolypase to alkyltransferoses are unique in as functions in the DNA repair mechanism.

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Most popular questions from this chapter

How many sliding clamps and clamp loading events are required for synthesis of the leading and lagging strands?

A certain mutant DNA polymerase is error-prone, tending to incorporate C opposite a template A. When such a DNA polymerase replicates a segment of DNA containing an A · T base pair, what will be the DNA composition in the daughter cells after (a) one and (b) two rounds of cell division? Assume that DNA repair does not occur.

Why must DNA be replicated semi discontinuously?

A composite transposon integrated in a circular plasmid occasionally transposes the DNA comprising the original plasmid rather than the transposon’s central region. Explain how this is possible.

The three DNA base pairs that fit within the active site of DNA polymerase have a conformation similar to that of A-DNA rather than the usual B-DNA. Why is it important for DNA polymerase to accommodate an A-type helix
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