NIOS Class 12 Chemistry Chapter 29 Biomolecules

NIOS Class 12 Chemistry Chapter 29 Biomolecules Solutions English Medium As Per New Syllabus to each chapter is provided in the list so that you can easily browse throughout different chapters NIOS Class 12 Chemistry Chapter 29 Biomolecules Notes in English and select need one. NIOS Class 12 Chemistry Solutions English Medium Download PDF. NIOS Study Material of Class 12 Chemistry Notes Paper Code: 313.

NIOS Class 12 Chemistry Chapter 29 Biomolecules

Also, you can read the NIOS book online in these sections Solutions by Expert Teachers as per National Institute of Open Schooling (NIOS) Book guidelines. These solutions are part of NIOS All Subject Solutions. Here we have given NIOS Class 12 Chemistry Notes, NIOS Senior Secondary Course Chemistry Solutions in English for All Chapter, You can practice these here.

Biomolecules

Chapter: 29

Module – VII: Chemistry of Organic Compounds

INTEXT QUESTIONS 29.1

1. Name three constituents of your diet which provide carbohydrates.

Ans: Cereals, fruits and sugar.

2. How are carbohydrates produced in nature?

Ans: Plants produce carbohydrates during photosynthesis.

3. What are the hydrolysis products of starch and sucrose?

Ans: Starch on hydrolysis gives glucose whereas sucrose on hydrolysis gives glucose and fructose.

4. Write the linear and ring forms of D-glucose.

Ans: Linear form: D-glucose in linear form has an open chain structure with an aldehyde (–CHO) group at one end.

Ring form: In water, D-glucose mainly exists in a ring form. The chain bends to form a six-membered ring called glucopyranose. It occurs as α-D-glucose and β-D-glucose.

INTEXT QUESTIONS 29.2

1. What do you understand by primary structure of protein?

Ans: Information regarding the sequence of amino acids in a protein chain is called its primary structure.

2. What do you mean by a peptide bond?

Ans: Proteins are made up of many α-amino acids which join together by the formation of an amide bond between –NH2 group of one amino acid and – COOH group of another. When two amino acids combine in this way, the resulting product is called a dipeptide and the amide bond between them is called a peptide bond.

3. Write the general structural formula of an a-amino acid?

Ans: An α-amino acid may be represented as:

4. What are conjugated proteins?

Ans: Conjugated proteins are proteins combined with a non-protein part called a prosthetic group. The protein part alone is not complete without this group.

Examples:

(i) Hemoglobin (protein + heme)

(ii) Lipoproteins (protein + lipid)

INTEXT QUESTIONS 29.3

1. What are lipids?

Ans: Biomolecules which are insoluble in water and soluble in organic solvents like benzene, ether or chloroform are called lipids.

2. What are the products of hydrolysis of an oil?

Ans: Oils on hydrolysis give glycerol and long chain fatty acids.

3. Name two important types of compound lipids.

Ans: Two types of compound lipids are phospholipids and glycolipids.

4. What is the basic difference between fats and oils?

Ans: A triglyceride which is solid at room temperature is called a fat and if it is liquid then it is called a

INTEXT QUESTIONS 29.4

1. What is a nucleotide?

Ans: A nucleotide consists of three subunits which are (i) a nitrogen containing heterocyclic aromatic compound, also called a base; (ii) a pentose sugar (ribose or 2-deoxy ribose) and (iii) a molecule of phosphoric acid.

2. Why structure DNA is called a “doublehelix”?

Ans: In DNA, two chains are wound around each other in the form of helix, hence the structure is called a double helix.

3. Write two main structural differences between DNA and RNA?

Ans: Two main structural differences between DNA and RNA are :

(i) DNA molecules are double stranded whereas RNA are single strand molecules.

(ii) In DNA molecules, the sugar moiety is 2-deoxyribose whereas in RNA  molecules, it is ribose.