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NCERT Solutions For Class 11 Biology Chapter 9 Biomolecules

NCERT Solutions For Class 11 Biology Chapter 9 Biomolecules

Edited By Irshad Anwar | Updated on Sep 06, 2023 02:24 PM IST

Chapter 9: Biomolecules, Class 11 NCERT | Solutions PDF Download (2023–24)

NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules: The most recent CBSE Syllabus 2022–23 of Biology Class 11 is used to categorise this chapter of Biomolecules Class 11 NCERT. The fundamentals must be understood by students who plan to pursue careers in medicine. For the convenience of the students, the NCERT Solutions for Class 11 include solutions for other subjects found in the textbook, answered in the same order. The experienced Subject experts crafted the Biomolecules Class 11 NCERT Solutions.

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This Story also Contains
  1. Chapter 9: Biomolecules, Class 11 NCERT | Solutions PDF Download (2023–24)
  2. NCERT Solutions For Class 11 Biology Biomolecules - PDF Download (2023-24)
  3. NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules: Solved Exercise Questions
  4. Q1. What are macromolecules? Give examples .
  5. NCERT Solutions for Class 11 Biology Chapter 9 – Biomolecules
  6. Important Topics of NCERT Solutions for Class 11 Biology Chapter 9 - Biomolecules
  7. Highlights of NCERT Solutions For Class 11 Biology Biomolecules
  8. NCERT Solutions for Class 11 Biology: Chapter-wise
  9. NCERT Solutions for Class 11: Subject-wise
  10. Check the NCERT Books and NCERT Syllabus here:

Do you know that there is a wide diversity of living organisms in our biosphere. As per the Biomolecules NCERT Biology, now the question that arises in our minds is: Are all living organisms made of the same chemicals, i.e., elements and compounds? As in the NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules you will get questions along with their answers and all will be related to the biomolecules. You have learnt in Chemistry how elemental analysis is performed. If we perform such an analysis on plant tissue, animal tissue or a microbial paste, we obtain a list of elements like carbon, hydrogen, oxygen and several others and their respective content per unit mass of living tissue. Chapter 9 Biomolecules, will tell you that, what type of organic compounds are found in living organisms? How does one go about finding the answer? To get an answer, one has to go with CBSE NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules. An examination reveals that the relative abundance of carbon, hydrogen, and oxygen is higher in living systems when compared to inanimate matter. With the help of NCERT Solutions, you will get the answer of all the questions of NCERT.

Biomolecules Class 11 NCERT: To understand the Biomolecules Class 11 NCERT Solutions, you have to learn that nucleic acids serve as genetic material, and polysaccharides are components of the cell wall in plants, fungi, and also of the exoskeleton of arthropods. According to the Biomolecules Class 11 PDF, they are also considered as storage forms of energy (e.g., starch and glycogen). Many of them are enzymes, some are antibodies, some are receptors, some are hormones and some others are structural proteins. Here, the Class 11 Biomolecules NCERT Solutions step in and meet all the students' academic needs.

After going through Solutions of Biomolecules NCERT Biology line by line, you must be able to understand all the answer the questions which are given in Biomolecules Class 11 NCERT PDF:

NCERT Solutions For Class 11 Biology Biomolecules - PDF Download (2023-24)

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NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules: Solved Exercise Questions

The complete solved exercise for Biomolecules Biology NCERT are given below:

Biomolecules Class 11 Questions and Answers

Q1. What are macromolecules? Give examples .

Answer:

The large sized complex molecules that get separated in acid-insoluble fraction using trichloroacetic acid are called macromolecules. These are polymers having a molecular mass of 10,000 daltons or more. Examples of macromolecules include proteins, carbohydrates, nucleic acids etc. Lipids are found to be present in the acid-insoluble fraction, however, they are not of high molecular weight.


Q2. Illustrate a glycosidic, peptide and a phospho-diester bond.

Answer:

Glycosidic bond- This bond is formed between the 1st carbon atom of one monosaccharide with 4 carbon atom of neighbouring monosaccharide unit. During the formation of this bond, a water molecule is released. A representation of a glycosidic bond is as follows

1650611989654


Peptide bond- This is a covalent bond formed between the carboxyl group of one amino acid and the amino group of neighbouring amino acid. A water molecule is released in the formation of a peptide bond. A representation of a peptide bond is as follows

1650612011609

Phosphodiester bond- It refers to the phosphate-hydroxyl linkage between two nucleotides. In this bond, the phosphate attached to the hydroxyl group at the 5' carbon of pentose sugar is in turn bonded to the hydroxyl group of the 3' carbon of the pentose sugar of the next nucleotide.

1650612039671


3. What is meant by tertiary structure of proteins?

Answer:

The three-dimensional structure of the protein which is formed after repeated coiling and folding of helical and pleated polypeptide chains is called its tertiary structure. By repeated coiling and folding, the polar side chains are exposed while non-polar amino acids are hidden. Tertiary structure is bonded via weak bonds. The functionality of a protein lies in its tertiary structures.

Solutions for NCERT Class 11 Biology Chapter 9 Biomolecules:

Q4. Find and write down structures of 10 interesting small molecular weight biomolecules. Find if there is any industry which manufactures the compounds by isolation. Find out who are the buyers.

Answer:

The structures of 10 small molecular weight biomolecules are as follows

1650612083293


1650612101714


These biomolecules are manufactured in biotechnology industries.

6. Find out and make a list of proteins used as therapeutic agents. Find other applications of proteins (e.g., Cosmetics etc.)

Answer:

Proteins with therapeutic uses are insulin, oxytocin, ADH, thrombin, fibrinogen, renin, immunoglobulin, diastase, streptokinase etc.

Other applications of proteins are

1. As cosmetics- Protein such as casein is used in beauty creams, shampoos etc.

2. Sweeteners- Thaumatin and monellin are sweet proteins.

3. Dietary supplements- Proteins can be used as dietary supplements.

Q7. Explain the composition of triglyceride.

Answer: 1

A triglyceride is a chemical formed by esterification of three molecules of fatty acids with one molecule of trihydric alcohol called glycerol. All the three fatty acids of triglyceride can be similar as in tripalmitin or dissimilar as in palmito-oleoistearin, dipalmitostearin etc.

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Class 11 Biology Chapter 9 Question Answers

Q8. Can you describe what happens when milk is converted into curd or yoghurt, from your understanding of proteins.

Answer:

Milk contains a protein called casein. When we add a little amount of curd to the milk, the protein casein gets coagulated due to the action of lactic acid bacteria and as a result of this milk is converted into curd. Coagulation disrupts the structure of the protein casein.

Q9. Can you attempt building models of biomolecules using commercially available atomic models (Ball and Stick models).

Answer:

Yes, we can attempt building models of biomolecules using commercially available atomic models such as ball and stick models. In these models, the stick is assumed to be bond while balls of different colours are assumed to be atoms.

Q10. Attempt titrating an amino acid against a weak base and discover the number of dissociating ( ionizable ) functional groups in the amino acid.

Answer:

When we titrate an amino acid against a weak base, it dissociates into its functional groups i.e. -COOH (carboxylic group) and -NH (amino group)

Q11. Draw the structure of the amino acid, alanine.

Answer:

The structure of amino acid alanine is represented below

1650613367015

Q13. Find out a qualitative test for proteins, fats and oils, amino acids and test any fruit juice, saliva, sweat and urine for them.

Answer:

A qualitative test for proteins is the xanthoproteic test. When urine is tested for protein with the help of the xanthoproteic test, the presence of a yellow precipitate confirms the presence of protein in it.

The qualitative test for fats is emulsification test. In this test, the experimental material is treated with ethanol and then dissolved in water. Formation of emulsion confirms the presence of fats.

The qualitative test for oils is the paper test. The experimental material is put on a paper. If oil marks are left, the presence of oil is confirmed.

The qualitative test for amino acids is ninhydrin test.

Class 11 Chapter 9 Biology NCERT Solutions

Q14. Find out how much cellulose is made by all the plants in the biosphere and compare it with how much of paper is manufactured by man and hence what is the consumption of plant material by man annually. What a loss of vegetation!

Answer:

Paper is made up of pulp of wood which is mainly constituted by cellulose. The cellulose is a polymer of glucose molecules joined together. About 85 billion tonnes of cellulose is formed annually in the biosphere. Paper manufacture consumes 0.5 billion tonnes of wood. The increase in consumption of wood has led to a great loss in vegetation.

Q15. Describe the important properties of enzymes.

Answer:

Enzymes are proteinaceous substances which are capable of catalysing chemical reactions of biological origin without themselves undergoing any change. They are commonly called as biocatalysts. The properties of enzymes are as follows:

1. Enzymes are proteins by nature

2. Optimum temperature- An enzyme is active within a narrow range of temperature. The temperature at which an enzyme is most active is called the optimum temperature. The enzyme activity decreased above and below this temperature.

3. Optimum pH- Every enzyme has an optimum pH at which it is maximum active. Most of the intracellular enzymes work at neutral pH.

4. Enzymes are substrate specific i.e. one enzyme catalyses only a particular substrate. Every enzyme has specific sites called active sites for the binding of substrate.

5. Only a small quantity of enzyme is capable of forming the desired product

6. Enzyme activity is sensitive to certain chemicals called inhibitors or modulators.

NCERT Solutions for Class 11 Biology Chapter 9 – Biomolecules

According to the latest CBSE Syllabus NCERT Solutions for Class 11 Biology, Chapter 9 – Biomolecules is categorised under Unit 3 – Cell: Structure and Functions. According to the question papers from previous years, this particular unit carries a maximum of 15 marks, or about 21% of the total weight of the paper. Class 11 Biology Chapter 9 Question Answers will help you score well.

If you have any queries about understanding the Biomolecules Class 11 NCERT PDF that are mentioned above, then again go through the Biomolecules Class 11 NCERT, try to solve them by yourself, and compare them with the Biomolecules Class 11 NCERT PDF. This will help you not only for your school exam but also in the preparation for other competitive exams like NEET.

Important Topics of NCERT Solutions for Class 11 Biology Chapter 9 - Biomolecules

The important topics and subtopics of Ch 9 Bio Class 11 are given below:

9.1 How to Analyse Chemical Composition?

9.2 Primary and Secondary Metabolites

9.3 Biomacromolecules

9.4 Proteins

9.5 Polysaccharides

9.6 Nucleic Acids

9.7 Structure of Proteins

9.8 Nature of Bond Linking Monomers in a Polymer

9.9 Dynamic State of Body Constituents - Concept of Metabolism

9.10 Metabolic Basis for Living

9.11 The Living State

9.12 Enzymes

  • 9.12.1 Chemical Reactions
  • 9.12.2 How do Enzymes bring about such High Rates of Chemical Conversions?
  • 9.12.3 Nature of Enzyme Action
  • 9.12.4 Factors Affecting Enzyme Activity
  • 9.12.5 Classification and Nomenclature of Enzymes
  • 9.12.6 Co-factors

Highlights of NCERT Solutions For Class 11 Biology Biomolecules

Highlights for Biomolecules NCERT Solutions Class 11 are given below:

  • The solution provided in the Biomolecules Class 11 PDF is written in the most readable and understandable way possible using straightforward language.
  • Points are used to frame responses in the Biomolecules NCERT Solutions Class 11 to aid in quick comprehension.
  • The questions and answers provided by the subject expert for the Biomolecules NCERT PDF Biology were taken directly from the Biology Textbook.
  • Biomolecules Class 11 Questions and Answers follow the most recent CBSE Syllabus NCERT pdf download is widely accessible and cost nothing.
  • Biomolecules Class 11 Solutions include a list of important topics.
  • Class 11 biology Chapter 9 NCERT solutions are a fantastic source of knowledge.
  • Class 11 Biomolecules NCERT Solutions will also help you prepare for competitive exams like NEET.
  • The Biomolecules Class 11 Exercise will enhance your knowledge of and interest in biology.
  • Your learning will start with NCERT, and it's simple to access Biomolecules PDF Class 11.
  • Students can download Class 11 Chapter 9 Biology NCERT Solutions and use them offline anytime, anywhere.

NCERT Solutions for Class 11 Biology: Chapter-wise

Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Biomolecules
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
Chapter 19
Chapter 20
Chapter 21
Chapter 22

NCERT Solutions for Class 11: Subject-wise


Check the NCERT Books and NCERT Syllabus here:


Frequently Asked Questions (FAQs)

1. What are the benefits of biomolecules class 11 ncert solutions?

The benefits of Chapter 9 of NCERT Solutions for Class 11 Biology are:

  • NCERT is the base of your learning.  
  • NCERT solutions for class 11 biology chapter 9 biomolecules will also help you with competitive exams like NEET.  
  • You will get all the answers to biomolecules ncert biology and biomolecules class 11 pdf will help you to score good marks in the exam. 
  • Biomolecules pdf class 11  will also help you in your 12th board exam.  
  • Biomolecules class 11 pdf will also boost your knowledge. 
  • To score well in the examination, follow the NCERT syllabus and solve the exercise given in the NCERT Book. To practice more problems, students must refer to NCERT Exemplar.
2. What are the different types of structures of biomacromolecules given biomolecules ncert biology?

The different types of structures of biomacromolecules given in Chapter 9 of NCERT Solutions for Class 11 Biology are: 

  • primary  
  • secondary  
  • tertiary and  
  • quaternary 
3. What are the important topics of ch 9 bio class 11?

The important topics of NCERT Solutions for Class 11 Biology Chapter 9 are: 

  • Primary and Secondary Metabolites  
  • Biomacromolecules  
  • Proteins  
  • Polysaccharides  
  • Nucleic Acids  
  • Structure of Proteins  
  • Nature of Bond Linking Monomers in a Polymer  
  • Dynamic State of Body Constituents - Concept of Metabolism  
  • Metabolic Basis for Living  
  • The Living State  
  • Enzymes 
4. List the characteristics of the enzymes discussed in Chapter 9 of the NCERT Solutions for Class 11 Biology.

The properties of enzymes covered in Chapter 9 of NCERT Solutions for Class 11 Biology are: 

  • The enzymes are complex macromolecules with a higher molecular weight.
  • The enzymes help break down larger molecules into simpler molecules by catalyzing the biochemical reactions occurring within the cell.
  • Enzymes can only speed up a reaction.
  • Enzymes have an impact on the biochemical reaction's rate, but they have no impact on the reaction's direction.
  • Enzymes are action specific.
  • At a pH level between 6 and 8, enzyme activity peaks.

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