Which of the following group/linkage is absent in adenine but present in guanine?

C - N

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- N H_{2}

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C = O

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- C O N H_{2}

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Solution

The correct option is C $C = O$
The -C=O link is present in guanine but is not present in adenine.
So, C is correct.

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Similar questions

(A) Proline is a secondary amine

(B) Most of natural α-aminoacids have L-configuration

(D) A trinucleotide has phosphodiester linkage.

Correct among the above statements are

$I$	$I I$
$(a)$ Hydrogen bond	$(i)$ Adenine - deoxyric base
$(b)$ N-glycosidic linkage	$(i i)$ Glucose - Fructose
$(c)$ Phosphodiester bond	$(i i i)$ Leucine - Glycine
$(d)$ Peptide bond	$(i v)$ Nucleotide - Nucleotide in polynucleotide chain
	$(v)$ Guanine - Cytosin on opposite strands of DNA

Which of the following are purine bases?
(a) Guanine (b) Adenine (c) Thymine (d) Uracil

\frac{A + T}{G + C} = 0.93

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