Question

The following statements regarding ‘lipids’ are given. Which of these are the correct statements.

• A. Lipids only have single bonds and such lipids are called unsaturated fatty acids.
• B. Palmitic acid has twenty carbons excluding the carboxyl group.
• C. Lecithin is a phospholipid.
• D. Trihydroxy propane is glycerol.

Answer 1

Answer: (C), (D)

Trihydroxy propane is glycerol.

The correct options are C and D.

Explanation for correct options:

Option C:

1. Lecithin is a phospholipid and is also known as Phosphatidyl Choline.
2. It comprises amino alcohol and choline.
3. Lecithin is mostly found in egg yolks and soybeans.
4. It is a component in the lipid bilayer of the cell membrane.

Option D:

1. Glycerol is known as trihydroxy propane.
2. It contains three hydroxyl groups.
3. It is an odorless, colorless, and viscous liquid.

Explanation for Incorrect Options:

Option A:

1. Lipids that have single bonds are known as saturated fatty acids.
2. These behave as structural units of the cell.

Option B:

1. Palmitic acid or hexadecanoic acid consists of sixteen carbons.

Final answer: Lecithin is a phospholipid and glycerol is known as trihydroxy propane.