Question

Read the following statements on lipids and find out correct set of statements:

1. Lecithin found in the plasma membrane is a glycolipids
2. Saturated fatty acids possess one or more c = c bonds
3. Gingely oil has lower melting point, hence remains as oil in winter
4. Lipids are generally insoluble in water but soluble in some organic solvents
5. When fatty acid is esterified with glycerol, monoglycerides are formed.

Choose the correct answer from the options given below

• A. (a), (b) and (c) only
• B. (a), (b) and (e) only
• C. (c), (d) and (e) only
• D. (a), (b) and (d) only

Answer 1

Answer: (C)

(c), (d) and (e) only

Answer 2

Some lipids have phosphorus and a phosphorylated organic compound in them. These are phospholipids. Example - Lecithin found in cell membranes is phospholipid and not glycolipid.
-Fatty acids could be saturated (without double bond) or unsaturated (with one or more C=C double bonds).
-Oils have a lower melting point (e.g., gingelly oil) and hence remain as oil in winters. So, this statement is correct.
-Lipids are all insoluble in polar solvents like water but highly soluble in the non-polar or weakly polar organic solvents, including ether, chloroform, benzene, and acetone. This is the correct statement.
-Many lipids have both glycerol and fatty acids. Here the fatty acids are found esterified with glycerol. They can then be monoglycerides, diglycerides and triglycerides. This statement is also correct.