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How many Rec A are present in one turn around the single stranded chromosome?

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How many Rec A are present in one turn around the single stranded chromosome?

(a) 5.2

(b) 9.0

(c) 2.3

(d) 6.2

The question was asked in an international level competition.

This key question is from Homologous DNA Recombination topic in division Genetic Recombination of Cytogenetics

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Correct answer is (d) 6.2

Easy explanation: 6.2 monomers of Rec A are necessary for one turn around the central chromosome. They form a right handed alpha helix around the chromosome.

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