Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store

NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules

ffImage
Last updated date: 12th Jul 2024
Total views: 796.2k
Views today: 14.95k

Biology Solutions For Biomolecules Class 11 NCERT PDF - FREE Download

Vedantu provides Biomolecules Class 11 NCERT Solutions, a key resource for students who want to navigate the concepts of Biology at the 11th-grade level. Students will learn about primary and secondary metabolites, biomacromolecules, proteins, nucleic acids, etc.

toc-symbol
Table of Content
1. Biology Solutions For Biomolecules Class 11 NCERT PDF - FREE Download
2. Glance on Biology Chapter 9 Biomolecules Class 11 NCERT Solutions
3. Access NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules
4. Class 11 Chapter 9 Biomolecules: Quick Overview of Topics Covered 
5. Deleted Topics In Class 11 Chapter 9: Biomolecules
6. Benefits  of Solutions for Biology Chapter 9 NCERT Biomolecules Class 11
7. Important Study Material Links for Biology Class 11 Chapter 9 Biomolecules
8. NCERT Solutions for Class 11 Biology FREE PDF | Other Chapter-wise Links
9. Related Important Links for Biology Class 11 Biology NCERT Solutions
FAQs


Class 11 Biology Chapter 9 Solutions are specially designed by Vedantu Master Teachers, who ensure that they comply with the latest CBSE Class 11 Biology syllabus. Therefore, students can rely upon these NCERT Solutions to prepare for their exams.


Glance on Biology Chapter 9 Biomolecules Class 11 NCERT Solutions

  • The chapter consists of Biomolecules such as Carbohydrates, proteins, nucleic acids, and lipids, which are the four classifications of macromolecules.

  • The Class 11 biomolecules NCERT PDF explains transcription and translation, the two key processes accomplished by nucleic acids.

  • Biomolecules questions and answers PDF class 11 also explain the metabolic pathways and enzymes.

  • Concepts like Protein's diverse functions in living organisms, including enzyme catalysis, structural support, transport, and signalling, are explained crisply and clearly.

  • Biomolecules class 11 NCERT has explained each question most easily using practical methods. 

  • From biomolecules class 11 NCERT solutions, students will get all the answers to all the questions given in the chapter exercise, which will help them to learn the chapter systematically.

  • The latest marking scheme suggests that Biology Class 11 Chapter 9, part of Unit III, will carry 12 marks for theory and four for practical questions, excluding Practical Record and Viva Voce.

Competitive Exams after 12th Science
tp-imag
bottom-arrow
tp-imag
bottom-arrow
tp-imag
bottom-arrow
tp-imag
bottom-arrow
tp-imag
bottom-arrow
tp-imag
bottom-arrow

Access NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules

1. What are macromolecules? Give examples?

Ans:  Chemical compounds, which are found in the acid-insoluble fraction are called macromolecules or biomacromolecules. As suggestive of its name, its molecular weights lie above \[1000\] Dalton. Consequently, micro molecules have molecular weights of less than \[1000\] Daltons. 

Examples of macromolecules are—proteins, lipids, and carbohydrates, etc. Except for lipids, all the other macromolecules including carbohydrates, proteins, and nucleic acids are polymeric substances.


2. What is meant by the tertiary structure of proteins?

Tertiary structure of proteins refers to the folding of a single polypeptide chain into a specific shape that determines the function of protein.


The tertiary structure of proteins


3. Find and write down structures of ten fascinating small molecular weight biomolecules. Find there is any industry that produces the compounds by isolation. Find out who the buyers are.

Ans:  The structures of ten different small molecular weight biomolecules are given below.

Glucose:


Glucose


Fructose:


Fructose


Cholesterol:


Cholesterol


Ribose:


Ribose


Deoxyribose:


Deoxyribose


Tyrosine:


Tyrosine


Tryptophan:


Tryptophan


Melatonin:


Melatonin


Adenine:


Adenine


Guanine:


Guanine


Many industries manufacture compounds by the process of isolation. Some examples are given below.

Industry

Compounds

Buyer

Pharmaceuticals manufacturing industries

Enzymes

Agriculture based food industries, such as companies manufacturing juices, jams, etc., research institutes, cosmetics, medicine companies, paper industry, clothing industry, etc.

The liquid glucose manufacturing industry

Liquid Glucose

Food companies, Drug and pharmaceutical companies.


4. Find out and create a list of proteins utilized as therapeutic agents. List additional uses of proteins (e.g., cosmetics, etc.)

Ans: A list of proteins used as therapeutic agents are given below.

Proteins

Therapeutic Use

  1. Insulin

Diabetes

  1. Vasopressin

Treatment of diabetes insipidus.

  1. Interleukin II

Used to prevent low platelets counts and to

decrease the requirement for blood transfusions following cancer treatments.

  1. Oxytocin

Used for inducing uterine contractions to induce labour during pregnancy.


  • Both plants and animals give the appropriate proteinaceous materials for the preparation of cosmetic items. Proteins from algae and fungi, though, are also increasingly being utilized as protein sources.

  • High-protein plants most widely used as beginning material for making vegetable proteins are wheat and corn gluten, rice, soy, and oat protein concentrates, and defatted oilseeds (almond, peanuts, sunflower). Among the larger variety of vegetable proteins, soy globulins and wheat gluten are by far of the widest use. Wheat gluten (often just known as wheat protein) is a distinctive cereal protein of high elasticity when hydrated. Soy proteins are useful because of their thickening and emulsifying effects.

5. Explain the composition of triglyceride.

Ans: Triglycerides are a type of lipids found in living beings, that are synthesised due to the esterification of three fatty acids with a glycerol molecule. These are also called fats and oils based on their melting points.

The composition of triglyceride


Oils have lower melting points as compared to fats. The three fatty acids may be different or the same. Therefore, they may be known as simple or mixed.


6. Can you try the structure of biomolecules utilizing commercially available atomic models (Ball and stick models).

Ans: Yes, we can create models of biomolecules using commercially available atomic models.


Models of biomolecules using commercially available atomic models


7. Draw the structure of the amino acid alanine.

Ans: The structure of alanine is given below.

The structure of alanine


8. What are gums made of? Is fevicol different?

Ans: Gums are made up of carbohydrates and chemically they are heteropolysaccharides. 

Fevicol is polyvinyl alcohol glue. It is different from natural gums as it is a synthetic product.

9. Find out a qualitative test for proteins, fats and oils, and starch amino acids and test any fruit juice, saliva, sweat, and urine for them.

Ans:

i. A qualitative test for proteins: Xanthoproteic test

Experimental Material

Observation

Inference

(a) Urine

Yellow precipitate

The formation of yellow precipitate suggests the presence of protein in the food material

(b) Water

No precipitate


ii. A qualitative test for fats: Emulsification test

Experimental Material

Observation

Inference

(a) Sweat

Oil droplets

Formation of oil droplets

i.e., emulsification signifies the presence of fats in the provided food material.

(b) Water

No oil droplet


iii. A qualitative test for oils: Paper test

Experimental Material

Observation

Inference

(a) Food material (sample) 

Paper turns into a Translucent

Opaque paper becomes translucent which suggests the presence of fats in the food material

(b) Water

Paper gets soggy


iv. A qualitative test for starch: Iodine test

Experimental Material

Observation

Inference

  1. Fruit juices

Blue-black colour when few drops of iodine are added.

The formation of blue-black colour suggests the presence of starch in the provided food material.

  1. Water

No change in colour 


10. Find out exactly how much cellulose is produced by the plants in the biosphere and then compare it to how much paper is produced by human beings and therefore, what is the use of plant material by man each year. What a loss of vegetation?

Ans: Most paper is formed from wood pulp. The major component of wood pulp is cellulose, a polymer made of several glucose molecules linked together. The cellulose molecules and their bonding to each other give the paper its properties. Nearly \[33\% \] of everything in the plant matter is cellulose. The cellulose content of wood is \[40 - 50\% \]and that of cotton is\[90\% \]. For industrial use, cellulose is mostly obtained from cotton and wood pulp. It is used primarily to produce paper and paperboard; to a smaller extent. It is converted into a large variety of derivative products like rayon and cellophane.

11. Describe the important properties of enzymes.

Ans: Enzymes are proteins that catalyse biochemical reactions in cells. So, usually, enzymes are proteins but sometimes RNA also behaves catalytically. Catalytic RNAs are called Ribozymes. Each enzyme works best at its optimum temperature. Subsequently, enzymes are proteins, they are denatured at high temperatures.

Properties of enzymes


Enzymes Work Most Excellent At Their Optimal pH


Enzymes Work Most Excellent At Their Optimal pH


Graph That Displays The Effect of pH On Enzyme Activity


Graph That Displays The Effect of pH On Enzyme Activity


i. With the rise in substrate concentration, the velocity of the enzymatic reaction increases at first. The reaction ultimately achieves a maximum velocity (v max) which is not exceeded by any additional increase in the concentration of the substrate. 

ii. The activity of an enzyme is also sensitive to the presence of particular chemicals (maybe modulators or inhibitors of enzyme action) that bind to the enzyme. 

iii. Enzymes are substrate-specific. Due to the three-dimensional folding of the enzyme, it forms pockets or crevices. One such pocket is called the active site. An active site of the enzyme is a crevice or a pocket at which the substrate binds.


Class 11 Chapter 9 Biomolecules: Quick Overview of Topics Covered 

S. No

Class 11 Chapter 9 Biomolecules Topics

1

How to analyse chemical composition?

2

Primary and Secondary Metabolites

3

Biomacromolecules

4

Proteins

5

Polysaccharides

6

Nucleic Acids

7

Structure of Proteins

8

Enzymes

  • Chemical Reactions, Chemical Conversions

  • Nature of Enzyme Actions

  •  Factors Affecting Enzyme Activity 

  • Classification and Nomenclature Co-factors


Deleted Topics In Class 11 Chapter 9: Biomolecules

  • Nature of Bond Linking Monomers in a Polymer

  • Dynamic State of Body Constituents- Concept of Metabolism?

  • Metabolic Basis of Living

  • The Living State


Benefits  of Solutions for Biology Chapter 9 NCERT Biomolecules Class 11

  • Teachers of a high calibre have created the Biomolecules class 11 NCERT PDF in Class 11 Biology Chapter 9 with illustrations for easy understanding.

  • This chapter includes Various biochemical techniques, such as chromatography, electrophoresis, and spectroscopy, used to study biomolecules and their functions.

  • Complex concepts such as the structure of biomolecules are intimately linked to their function, and the structure of biomolecules helps in understanding their roles in living organisms, which is discussed concisely.

  • Nucleic acids, including DNA and RNA structured and detailed representations, help students easily grasp the concept.

  • The Biomolecules Questions and Answers PDF class 11 aims to save students valuable time so they can reap the maximum benefit in less time.

  • Biology Chapter 9 biomolecules class 11 questions and answers accurately cover the entire chapter.


Important Study Material Links for Biology Class 11 Chapter 9 Biomolecules


Conclusion

Chapter 9 NCERT biomolecules class 11 provides students with simple and detailed definitions and explanations of each concept covered in the chapter. Therefore, it is highly recommended that students download and refer to our comprehensive and expert-curated class 11 biomolecules NCERT PDF to get a gist of the chapter before the exam and to know how to answer the questions in the exam. Students can also refer to our plethora of other study resources related to this chapter, which are free on our website.


NCERT Solutions for Class 11 Biology FREE PDF | Other Chapter-wise Links

Given below are the other chapter-wise Links for the Solutions for Biology NCERT Class 11:



Related Important Links for Biology Class 11 Biology NCERT Solutions

FAQs on NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules

1. Explain Macromolecules with an Example from biomolecules class 11 NCERT PDF.

Macromolecules or biomacromolecules are polymerised biomolecules that constitute an array of macromolecules having a high degree of molecular weight. Such formation of significantly large biomolecules is macromolecules. Their molecular weight roughly lies between 18 to 800 daltons (Da). Though macromolecules are comparatively larger than other molecules, you cannot see it with a naked eye. You can find these complex macromolecules in a colloidal state present in the intercellular fluid and are polymeric. Broad macromolecules examples are protein, nucleic acids, polysaccharides, etc. Other macromolecules examples are DNA, RNA, Nylon, Polyester, Keratin in hair, waxes,oil, steroids, grease, hormones, etc. 

2. Can you use Protein as a Therapeutic Agent?  What are the Other Applications of Protein?  List Them.

Yes, protein can be used as therapeutic agents. Scientists have formulated proteins in the laboratory for several pharmaceutical requirements. Such proteins are termed therapeutic proteins, including:

  • Antigens

  • Diastase

  • Streptokinase

  • Renin

  • Vasopressin

  • Insulin,

  • Antibody-based drugs

  • Enzymes,

  • Fc fusion proteins,

  • Bone morphogenetic proteins,

  • Engineered protein scaffolds.

Therapeutic proteins with carbohydrate profile affect solubility, cellular interactions, tertiary structural stability, immunogenicity, and pharmacokinetics. Thus, they are considered significant in several serious ailments, such as cancer treatment, HIV, etc. Furthermore, proteins are a useful element in cosmetics, textile industries, textile industries, biological buffers, and research techniques. Therapeutic proteins have transformed the healthcare sector.

3. What are the benefits of Class 11 Biomolecules class 11 NCERT Solutions?

There are many benefits of NCERT solutions for Class 11 Biology Chapter 9 Biomolecules, which is available on Vedantu for free. The content is given chapter-wise and in an easy-to-understand language. In Chapter 9 Biomolecules, all the topics and questions/answers are given in one place as it is convenient for the students to study. Explanations are given in a detailed as well as a precise manner and written by Biology experts.

4. What are the important topics from Biomolecules Class 11 NCERT?

For the preparation of class tests and annual exams, Vedantu helps the students to get easy and free access to NCERT Solutions for Class 11 Biology chapter-wise. The solutions are also available on the Vedantu Mobile app. Some of the important topics that are covered in NCERT Solutions for Class 11 Biology from Chapter 9 are listed below:


1. Enzymes-Types


2. How is chemical composition analysed


3. Theory of metabolism


4. Primary and Secondary Metabolites


5. Proteins arrangement


6. Nucleic acids.

5. Throw some light on Macromolecules in biomolecules questions and answers PDF Class 11.

The word ‘micro’ means small. In simple terms, molecules that are mini or small in size are called micro molecules. They are also called ‘monomers,’ which are combined to form ‘polymers’ or large molecules. They have a low molecular weight in comparison to macromolecules. Through metabolic processes, micro molecules are formed.

6. List out the main physical properties of Amino Acids.

The main physical properties of amino acids are given below :

  1. They don’t contain any colour. Hence they are colourless

  2. They are decomposed when they are heated to higher temperatures

  3. They have a high melting point, which is more than 200 degrees celsius, 

  4. Their existence is usually in d, and I form

  5. Apart from glycerine, which is perceptibly inactive, all the amino acids are perceptibly active.

7. What is the weightage of marks from Chapter 9 Biomolecules Class 11 questions and answers?

The weightage of marks from Biology Chapter 9 Biomolecules vary across topics. Questions come in short as well as long types. However, they don't fetch you a lot of marks. Most of the questions are from the NCERT course book only. However, it can be useful. Hence, complete preparation is advised. 

8. What happens due to a deficiency of Proteins mentioned in biomolecules NCERT PDF Class 11?

Deficiency of proteins leads to:

  • Stunted growth

  • Muscle wasting

  • Poor wound healing

  • Dry, brittle hair

  • Poor wound healing

  • Anemia

  • Hormonal Imbalances

9. What are the main points of biomolecules from NCERT Biomolecules Class 11?

Biomolecules consist of proteins, polysaccharides, and nucleic acids. It consists of primary and secondary metabolites. Students can download and refer to Biomolecules NCERT PDF class 11 to learn more about it.

10. What is the Speciality of biomolecules questions and answers PDF class 11?

Biomolecules class 11 NCERT PDF includes all the solutions related to chapter 9 to prepare for board exams. Students can download and refer to biomolecules class 11 NCERT solutions.