NCERT Solutions for Class 11 Biology Chapter 9 – Biomolecules

Q1: What are macromolecules? Give examples.

Answer:

Large complex molecules, such as nucleic acids, proteins, carbohydrates, and lipids, with relatively large molecular weight. Examples:

• Carbohydrates: Glucose, sucrose, starch, cellulose, chitin.
• Lipids: Fats, phospholipids, oils, steroids.
• Proteins: Keratins, hormones, enzymes.
• Nucleic acid: DNA, RNA.

Q2: What is meant by the tertiary structure of proteins?

Answer:

The long protein chain folded upon itself like a hollow woollen ball, which gives us a 3-dimensional view of a protein is known as a tertiary structure of the protein. Tertiary structure is absolutely necessary for the many biological activities of proteins.

Also Read: Protein Structure – Primary, Secondary, Tertiary, Quaternary

Q3: 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:

1: Adenosine

2: Lactose

3. Ribose

4. Thymidine

5: Sucrose

6: Maltose

7: DNA

8: RNA

9: Glycerol

10: Insulin

Q4: Find out and make a list of proteins used as therapeutic agents. Find other applications of proteins (e.g., Cosmetics etc.)

Answer:

Proteins used as therapeutic agents are as follows:

• Insulin – It helps in maintaining blood glucose levels in the body.
• Antigen (antibody) – It helps in blood transfusion.
• Thrombin and fibrinogen – They help in blood clotting.
• Renin – It helps in osmoregulation.

Proteins are also commonly used in the manufacture of toxins and as biological buffers.

Also Read: Types of Protein: Structure, Function and Classification

Q5: Explain the composition of triglyceride.

Answer:

A triglyceride is composed of glycerol and three fatty acids. Triglycerides are the predominant component of most food fats and oils. The minor components include mono- and diglycerides, free fatty acids, phosphatides, sterols, fatty alcohols, fat-soluble vitamins, and other substances.

Structure of Triglyceride:

Q6: Can you attempt building models of Biomolecules using commercially available Atomic Models (Ball and Stick Models)?

Answer:

Yes, the ball and stick model can be used to represent biomolecules. Sticks depict the bonds that hold the molecule together, while balls represent the atoms. A model of D-glucose is shown below, with hydrogen atoms represented by green balls, oxygen atoms represented by pink balls, and carbon atoms represented by grey balls.

Q7:  Draw the structure of the amino acid, alanine.

Answer:

NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules: The NCERT chapter on Biomolecules for class 11 is important for students approaching the board exams. This article introduces NCERT solutions designed to help students explain the concepts of further learning and how to write to get good grades on exams. The solutions are presented in very simple language for ease of understanding.

Class 11 Biology Chapter 9 NCERT Solutions clearly explain the concepts related to biomolecules, including the structure, function, and significance of carbohydrates, proteins, lipids, and nucleic acids in living organisms. This chapter is important for class 11th examinations and hence should be studied properly. This chapter further explains the concept of Biomolecules in detail. Revise the basic concepts of Biomolecules for quick revision and class notes. Here, you will find the best NCERT Solutions of Biomolecules Class 11.