Q.

Nitrogen base that is absent in RNA

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a

Adenine

b

Guanine

c

Cytosine 

d

5-methyl uracil

answer is B.

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Detailed Solution

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NCERT Page No.81

RNA is single stranded,i t has four different nitrogenous  bases 

Purines: Adenine ,Guanine 

Pyriminines Cytoisne and Uracil

Thymine is absent in RNA  but present in DNA.

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