The four elements making 99 % of living system are:

(1) CHOS

(2) CHOP

(3) CHON

(4) CNOP

Subtopic:  Element Analysis |
 91%
From NCERT
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Glycogen is a polymer of:

(1) Galactose

(2) Glucose

(3) Fructose

(4) Sucrose

Subtopic:  Carbohydrates |
 87%
From NCERT
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An enzyme brings about:

(1) Decrease in reaction time

(2) Increase in reaction time

(3) Increase in activation energy

(4) Reduction in activation energy

Subtopic:  Enzyme Catalysis |
 86%
From NCERT
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The backbone of a DNA molecule is formed by:

(1) nitrogenous bases

(2) deoxyribose sugar

(3) phosphate groups

(4) alternate sugar and phosphate moieties

 84%
From NCERT
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A glycosidic bond connects:

(1) two monosaccharides

(2) two amino acids

(3) two fatty acids

(4) a fatty acid and a glycerol  

Subtopic:  Carbohydrates: Glycosidic Bond & Disaccharide |
 86%
From NCERT
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The inhibition of succinic dehydrogenase by malonate is an example of:

(1) Non-competitive reversible inhibition

(2) Non-competitive irreversible inhibition

(3) Competitive inhibition

(4) Allosteric inhibition

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 90%
From NCERT
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The enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds are called as:

(1) Oxidoreductases

(2) Hydrolases

(3) Ligases

(4) Lyases

Subtopic:  Enzymes Classification |
 87%
From NCERT
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The following diagram depicts the structure of a:


1. Nucleoside
2. Nucleotide
3. Nitrogen containing Monosaccharide
4. Glycoprotein

Subtopic:  Nucleic Acid: Nucleotides |
 88%
From NCERT
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Which of the following is the simplest amino acid -

1. Alanine 

2. Asparagine

3. Glycine 

4. Tyrosine

Subtopic:  Amino Acids |
 92%
From NCERT
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Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by -

1. Base-sugar-OH

2. Base-sugar-phosphate

3. Sugar-phosphate

4. (Base-sugar-phosphate)n

Subtopic:  Nucleic Acid: Nucleotides |
 73%
From NCERT
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