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Question

Sugar which is found in DNA but not in RNA is


A
Deoxyribose
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B
Ribose
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C
Uracil
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D
Cytosine
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E
Thymine
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Solution

The correct option is A Deoxyribose
Options C, D and E are incorrect as they are nitrogenous bases. Option B is incorrect as ribose sugar is found in RNA only. DNA contain 2’deoxy-D-ribose sugar, and the RNA contain D-ribose sugar; the difference lying in the absence of an oxygen atom at 2’ position only. 
Therefore, the correct answer is option A.

Biology

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