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NCERT Exemplar · Class 12 · Chemistry

Chapter 14: Biomolecules

Practice each question, then open the answer or worked solution.

Questions

19 questions
Q1Multiple choice

Glycogen is a branched-chain polymer of α-D-glucose units in which the chain is

formed by C1—C4 glycosidic linkage, whereas branching occurs by the

formation of C1-C6 glycosidic linkage. The structure of glycogen is similar to

__________.

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Correct option: B
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Worked solution

Option (ii) is the answer.

Q2Multiple choice

Which of the following polymer is stored in the liver of animals?

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Correct option: D
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Worked solution

Option (iv) is the answer.

Q3Written answer

Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis

gives _________.

(i) 2 molecules of glucose

(ii) 2 molecules of glucose + 1 molecule of fructose

(iii) 1 molecule of glucose + 1 molecule of fructose

(iv) 2 molecules of fructose

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Worked solution

Option (iii) is the answer.

Q4Written answer

Which of the following pairs represents anomers?

NCERT Exemplar Solutions of Class 12 Chemistry Chapter 14 Biomolecules-1

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Worked solution

Option (C) is the answer.

Q5Written answer

Proteins are found to have two different types of secondary structures viz.

α-helix and β-pleated sheet structure. α-helix structure of the protein is stabilised

by :

(i) Peptide bonds

(ii) van der Waals forces

(iii) Hydrogen bonds

(iv) Dipole-dipole interactions

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Worked solution

Option ( iii) is the answer.

Q6Written answer

In disaccharides, if the reducing groups of monosaccharides, i.e. aldehydic or ketonic groups, are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?

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Worked solution

NCERT Exemplar Solutions of Class 12 Chemistry Chapter 14 Biomolecules-2

Option (B) is the answer.

Q7Multiple choice

Which of the following acids is a vitamin?

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Correct option: B
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Worked solution

Option (ii) is the answer.

Q8Multiple choice

Dinucleotide is obtained by joining two nucleotides together by phosphodiester

linkage. Between which carbon atoms of pentose sugars of nucleotides are

Are these linkages present?

Option (i) is the answer.

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Worked solution

Solution coming soon.

Q9Written answer

Nucleic acids are the polymers of ______________.

(i) Nucleosides

(ii) Nucleotides

(iii) Bases

(iv) Sugars

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Worked solution

Option (ii) is the answer.

Q10Multiple choice

Which of the following statements is not true about glucose?

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Correct option: C
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Worked solution

Option (iii) is the answer.