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In a phosphothiorate nucleotide, oxygen atom is replaced by with atom?

(a) Magnesium

(b) Calcium

(c) Sodium

(d) Sulphur

The question was posed to me in unit test.

The above asked question is from Mutagenesis using PCR and Recovery of Mutated Sequences in division Modifications and Mutagenesis of Genetic Engineering

1 Answer

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Best answer
The correct choice is (d) Sulphur

The explanation is: In a phosphothiorate nucleotide, oxygen atom is replaced by a sulphur atom. Because of this replacement the DNA molecule becomes resistant to attack by nucleases.

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