Question

How many of the compounds given below represent nucleosides (X) and nucleotides (Y)?
Adenylic acid, cytidine, AMP, DCTP, Guanosine, dAMP
(1) X=4, Y=2 (2) X=3, Y=3
(3) X=2, Y=4 (4) X=1, Y=5​

Answer 1

Answer:

(3) is correct

Explanation:

Nucleosides : Cytidine, Guanosine

Nucleotides : Adenylic acid, AMP, DCTP, dAMP

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Answer 2

Answer:

Nucleosides (X) represent two and nucleotides (Y) represent four compounds. So, the correct option is  (3) X=2, Y=4

Explanation:

A nitrogenous base is linked to the first carbon of pentose sugar through N-glycosic linkage to form nucleoside. Example -Adenosine, Guanosine Cytidine, Uridine.

Nucleotide has three parts :

• A nitrogenous base
• A pentose sugar (deoxyribose in DNA and ribose in RNA)
• A phosphate group

Purine and pyrimidine are two types of nitrogenous bases.The two major pyrimidine bases found in DNA are thymine and cytosine and in case of RNA instead of thymine it is uracil.The common purine bases found in DNA and RNA are adenine and guanine. Examples of nucleotides are Adenylic acid, AMP (adenosine monophosphate), dAMP(deoxyadenosine monophosphate), DCTP(deoxycytidine triphosphate).

So, the correct option is option no. (3) X=2, Y=4