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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Describe nucleotides.

Nucleotides are the basic unit of nucleic acids. It has three components which are chemically distinct :

(1) Nitrogen containing ring organic compound or heterocyclic compound. It can be adenine, guanine, cytosine, thymine (in DNA), uracil (in RNA). 

(2) A pentose sugar. The pentose sugar is ribose in case of RNA and 2' deoxyribose in case of DNA. 

(3) A molecule of phosphoric acid.

Give the names of two monosaccharide sugars.

Fructose and glucose are two monosaccharides

What is the general formula of carbohydrates ?

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

What is the percentage of nucleic acids in cells ?

5 - 7 percent

Name one monosaccharide which provides energy ?


What are major elements of a cell ?

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