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What will be DNA sequence of Shine and Dalgarno coding region?

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What will be DNA sequence of Shine and Dalgarno coding region?

(a) A/T rich

(b) C/G rich

(c) A/G rich

(d) C/T rich

The question was posed to me in my homework.

My question is from Ribosome in chapter Gene Expression : Translation of Cytogenetics

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Right choice is (d) C/T rich

To explain: As the Shina and Dalgarno region is purine rich i.e. A/G rich, its corresponding DNA sequence should be pyrimidine rich or C/T rich. This is because a purine base pairs with a pyrimine so a Pyrimidine will code for a purine in RNA.

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