Revision Notes For For Class 11 Biology Chapter 9 Biomolecules

Biomolecules, which are also called the biological molecules, are the organic or the naturally occurring molecules in all living cells. They are the polymers of a high molecular weight of hydrogen and carbon molecules along with the oxygen, sulphur, nitrogen, and phosphorus. Biomolecules are large molecules composed of several atoms that are covalently bound together. There are four major classes of biomolecules:

  • Lipids
  • Proteins
  • Nucleic acids
  • Carbohydrates

These biomolecules have a common fundamental relationship between structure and its functions. They are essential for the proper functions of the body cells and tissues and are manufactured within the body cells.

CBSE Class 11  Biology Chapter 9 Notes 

For more information about the Biomolecules, click on the below-mentioned links.

Carbohydrates Proteins
Lipids Differences between DNA and RNA

Frequently asked Questions on CBSE Class 11 Biology Notes Chapter 9: Biomolecules


What are Biomolecules?

Biomolecules are chemical compounds found in living organisms. For ex., nitrogen, sulphur, phosphorus, carbon, hydrogrn, etc.


What are some of the main uses of biomolecules?

Biomolecules have multiples roles to play in a human body. 1. Carbohyrates: Helps in sugar breakdown and glucose creation 2. Lipids: energy supply to cells 3. Proteins: Act as building blocks of life


What is the abbreviation of DNA?

DNA stands for ‘Deoxyribonucleicacid’.


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