Question:

Following are the statements with reference to ‘lipids’. 
(a) Lipids having only single bonds are called unsaturated fatty acids.
(b) Lecithin is a phospholipid. 
(c) Trihydroxy propane is glycerol.
(d) Palmitic acid has 20 carbon atoms including carboxyl carbon. 
(e) Arachidonic acid has 16 carbon atoms. 
Choose the correct answer from the options given below.

Updated On: Nov 13, 2025

  • (b) and (e) only

  • (a) and (b) only

  • (c) and (d) only

  • (b) and (c) only

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The Correct Option is D

Solution and Explanation

To determine the correct answer, we need to evaluate each statement regarding lipids and select the accurate ones.

  1. Statement (a): Lipids having only single bonds are called unsaturated fatty acids.
    • This statement is incorrect. Fatty acids with only single bonds are termed saturated fatty acids, while those with one or more double bonds are known as unsaturated fatty acids.
  2. Statement (b): Lecithin is a phospholipid.
    • This statement is correct. Lecithin is indeed a phospholipid, which is an essential component of cell membranes and serves as an emulsifier in various biological and industrial processes.
  3. Statement (c): Trihydroxy propane is glycerol.
    • This statement is correct. Glycerol, or glycerine, is chemically known as trihydroxy propane and forms the backbone of triglycerides and phospholipids.
  4. Statement (d): Palmitic acid has 20 carbon atoms including carboxyl carbon.
    • This statement is incorrect. Palmitic acid actually has 16 carbon atoms, including the carboxyl carbon, making it a saturated fatty acid.
  5. Statement (e): Arachidonic acid has 16 carbon atoms.
    • This statement is incorrect. Arachidonic acid contains 20 carbon atoms, not 16, and is a polyunsaturated fatty acid associated with inflammation signaling pathways.

Based on the evaluation of the statements, the correct statements are (b) and (c).

Therefore, the correct answer is (b) and (c) only.

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Biomolecules

Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.

There are four major classes of Biomolecules –  Carbohydrates, Proteins, Nucleic acids and Lipids.

  1. Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
  2. Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
  3. Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
  4. Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.