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One of the commonly used markers is the URA3 gene. It encodes for ______ biosynthesis.

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One of the commonly used markers is the URA3 gene. It encodes for ______ biosynthesis.

(a) adenine

(b) uracil

(c) guanine

(d) cytosine

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I want to ask this question from Markers in portion Using Other Organisms of Genetic Engineering

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The correct answer is (b) uracil

Easiest explanation: URA3 gene is a commonly used selectable marker. It encodes an enzyme for uracil biosynthesis. The enzyme encoded is orotidine-5’-phosphate decarboxylase.

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