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Chapter 25: 3cp (page 882)

Why must DNA be replicated semi discontinuously?

Short Answer

Expert verified

DNA replication: - The process of copying the DNA is called DNA replication.

Step by step solution

01

Semi discontinuously

During DNA replication the leading strand is synthesized continuously and the lagging strand is synthesized discontinuously. It is called semi discontinuous. Replication of DNA.

02

 Semi Discontinuous synthesis

The DNA synthesis is always in the S1 to 31 direction in both strands. The strand which is discontinuously synthesized is referred to as the 鈥榣aggingstrand鈥�. The one continuously polymerized is called the 鈥渓eading strand鈥�.

Simultaneously, both strands take place in replication of DNA. But it has pieces of about 100-250 nucleotides in length. In lagging the segment is joined by ligase enzymes.

Thus, DNA must be replicated semi discontinuously.

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Most popular questions from this chapter

Yeast and some other organisms produce proteins that closely resemble -alkylguanine鈥揇NA alkyltransferase but lack a Cys at the active site. (a) Explain why these proteins cannot remove an alkyl group attached to guanine. (b) These proteins do protect cells against DNA alkylation damage. In which type of repair process are these proteins most likely to participate?

Explain why TUS is the only replication protein that is sequence-specific?

Why is a practical to test carcinogen by mutagenesis assay?

Why are there no Pol I mutants that completely lack 5'鈫�3' exonuclease activity?

What are the functions of DNA phtolyases and alkytransfarses?
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