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QUESTION 1 In E. coll, there is a mutation in a gene called dnaB that alters the helicase that normally acts at the origin. W
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1. DNA helicase are the enzyme that is involved in unwunding the strands of DNA , so that they become separated and lead to the formation of replication fork. But if the dnaB gene get mutated, the function of helicase enzyme will altered and replication fork will not be formed. Hence, option B is correct.

2. The model of DNA replication is called as (semi-conservative model). This is because during DNA replication, one strand is parent strand and other one is daughter strand.

3. PSII is present in light reaction and is excited by wavelength of 680. Two products of PSII are oxygen and ATP. Hence, option C and D are correct.

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