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.

• (b) and (e) only
• (a) and (b) only
• (c) and (d) only
• (b) and (c) only

Answer 1

The Correct Option is D

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.