Table of Contents
NCERT Exemplar Solutions for Class 12 Chemistry Chapter 14 Biomolecules is an essential study material to learn this chapter thoroughly. Biomolecules is a critical chapter that forms the foundation for concepts you will encounter in your graduate-level studies, especially if you plan to pursue Chemistry and Biology-related courses.
The NCERT Exemplar Solutions for Class 12 Chemistry Chapter 14 PDF includes questions from the NCERT exemplar book, along with MCQs for exams like NEET and JEE. This resource will help you become familiar with important questions, thereby aiding in scoring well in graduate entrance examinations.
NCERT Exemplar for Class 12 Chemistry – Biomolecules – Free PDF Download
Access NCERT Exemplar Solutions for Class 12 Chemistry Chapter 14
Q. Which of the following polymer is stored in the liver of animals?
(i) Amylose
(ii) Cellulose
(iii) Amylopectin
(iv) Glycogen
Answer: Correct Option is (iv)
Q. 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
Answer: Correct Option is Option ( iii)
Q. Which of the following acids is a vitamin?
(i) Aspartic acid
(ii) Ascorbic acid
(iii) Adipic acid
(iv) Saccharic acid
Answer: Correct Option (ii)
Q. Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkages present?
(i) 5′ and 3′
(ii) 1′ and 5′
(iii) 5′ and 5′
(iv) 3′ and 3′
Answer: Correct Option (i)
Also Read: NCERT Syllabus
Q. Which of the following statements is not true about glucose?
(i) It is an aldohexose.
(ii) On heating with HI, it forms n-hexane.
(iii) It is present in furanose form.
(iv) It does not give 2,4-DNP test.
Answer: Correct Option (iii)
Q. Each polypeptide is a protein that has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be ____________.
(i) primary structure of proteins.
(ii) secondary structure of proteins.
(iii) the tertiary structure of proteins.
(iv) quaternary structure of proteins.
Answer: Correct Option (i)
Q. DNA and RNA contain four bases each. Which of the following bases is not present in RNA?
(i) Adenine
(ii) Uracil
(iii) Thymine
(iv) Cytosine
Answer: Correct Option (iii)
Q. Which of the following B group vitamins can be stored in our body?
(i) Vitamin B1
(ii) Vitamin B2
(iii) Vitamin B6
(iv) Vitamin B12
Answer: Correct Option (iv)
Q. Carbohydrates are classified on the basis of their behaviour on hydrolysis and also as reducing or non-reducing sugar. Sucrose is a __________.
(i) monosaccharide
(ii) disaccharide
(iii) reducing sugar
(iv) non-reducing sugar
Answer: Correct Option (ii) and (iv)
Q. Which of the following carbohydrates are branched polymer of glucose?
(i) Amylose
(ii) Amylopectin
(iii) Cellulose
(iv) Glycogen
Answer: Correct Option (i) and (iv)
Read More: NCERT Syllabus Class 12
Short Answer Types
Q. Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called?
Ans. The sugar present in milk is lactose. It contains two monosaccharide units, glucose and galactose, and is called a disaccharide.
Q. How do you explain the presence of all six carbon atoms in glucose in a straight chain?
Ans. The presence of all six carbon atoms in a straight chain of glucose is explained by its open-chain structure where the aldehyde group at one end and hydroxyl groups on the other carbon atoms form a straight chain.
Q. In nucleoside, a base is attached at the 1′ position of the sugar moiety. At which position of the sugar unit is the phosphoric acid linked to form a nucleotide?
Ans. The phosphoric acid is linked to the 5′ position of the sugar unit to form a nucleotide.
Q. Name the linkage connecting monosaccharide units in polysaccharides.
Ans. The linkage connecting monosaccharide units in polysaccharides is called a glycosidic linkage.
Q. Under what conditions is glucose converted to gluconic and saccharic acid?
Ans. Glucose is converted to gluconic acid under mild oxidation conditions using an oxidizing agent like bromine water, and to saccharic acid under strong oxidation conditions using agents like nitric acid.
Q. In which class of monosaccharide will you place fructose based on the number of carbon atoms and the presence of a ketone group?
Ans. Fructose is classified as a ketohexose because it contains six carbon atoms and a ketone group.
Q. Predict whether the given compound has ‘D’ or ‘L’ configuration.
Ans. The compound’s configuration is predicted based on the position of the -OH group on the lowest asymmetric carbon atom. If it is on the right, it is ‘D’ configuration; if on the left, it is ‘L’ configuration.
Q. What is the relative configuration of ribose and 2-deoxyribose found in nucleic acids?
Ans. Ribose and 2-deoxyribose both have the ‘D’ configuration in nucleic acids.
Q. Which sugar is called invert sugar and why?
Ans. Sucrose is called invert sugar because, upon hydrolysis, it yields an equimolar mixture of glucose and fructose, which results in a change in the direction of optical rotation from dextrorotatory to laevorotatory.
Q. Which type of amino acids form the polypeptide chain in proteins?
Ans. α-Amino acids form the polypeptide chain in proteins.
More Resources for Class 12
- NCERT Exemplar Solutions for Class 12 Physics
- NCERT Exemplar Solutions for Class 12 Biology
- NCERT Exemplar Solutions for Class 12 Maths
Important Topics Covered in Class 12 Chemistry Chapter 14 Biomolecules
- Carbohydrates – classification, structure, preparation and importance
- Nucleic Acids – chemical composition, structure, biological functions
- Enzymes – mechanism of enzyme action
- Vitamins – classification, the importance
- Proteins – amino acids, structure, denaturation
- Hormones
FAQs on NCERT Exemplar Solutions for Class 12 Chemistry Chapter 14
What are the types of polymerization reactions covered in this chapter?
The types of polymerization reactions covered are – 1. Addition polymerization which includes three steps Chain initiation Chain propagation Chain termination 2. Condensation polymerization is also known as step-growth polymerization.
What are the topics discussed in this chapter?
The topics discussed are – 1. Classification of Polymers 2. Types of Polymerisation Reactions 3. Molecular Mass of Polymers 4. Biodegradable Polymers 5. Polymers of Commercial Importance
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