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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Distinguish between Purines and Pyrimidines.



(1) Its molecules is double ringed.

(2) It is a nine membered ring.

(3) Its molecule is larger.

(5) For eg. Adenine and guanine.

(1) Its molecule is single ringed.

(2) It is six membered ring.

(3) lIts molecule is smaller.

(4) For e.g Thymine and cytosine. 

Name one monosaccharide which provides energy ?


What is the general formula of carbohydrates ?

The carbohydrate has a general formula - CnH2nOn Or (CH2O)n.

What are major elements of a cell ?

Carbon, hydrogen, oxygen and nitrogen are the major elements of a cell.

Give the names of two monosaccharide sugars.

Fructose and glucose are two monosaccharides

What is the percentage of nucleic acids in cells ?

5 - 7 percent