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Class 10 Class 12
How are complementary base pairs joined in a DNA double helix ?

The base pairs are joined together by hydrogen bonds.  Complementary base pairing always takes place between a purine and a pyrimidine base.

(2) A always pairs with T, G always pair with C.

(3) A-T pair has two hydrogen bonds, whereas G-C pair has three hydorgen bonds.

Complementary base pairing of DNA

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What are major elements of a cell ?

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

What is the percentage of nucleic acids in cells ?

5 - 7 percent
634 Views

Name one monosaccharide which provides energy ?

Glucose
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Give the names of two monosaccharide sugars.

Fructose and glucose are two monosaccharides
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What is the general formula of carbohydrates ?

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