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## Previous Year Papers

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Class 10 Class 12
What are the basic units of :
(1) DNA (2) RNA ?

The basic units of DNA and RNA are :

(1) Deoxyribonucleotide is the basic unit of DNA.

(2) Ribonucleotide is the basic unit of RNA.

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What is the general formula of carbohydrates ?

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

What are major elements of a cell ?

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

Name one monosaccharide which provides energy ?

Glucose
698 Views

Give the names of two monosaccharide sugars.

Fructose and glucose are two monosaccharides
670 Views

What is the percentage of nucleic acids in cells ?

5 - 7 percent
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