Question

What are glycerides of fatty acids
(a) Lecithin
(b) Phospholipids of plasma membrane
(c) Vegetable oils
(d) All of the above

Answer 1

Hint Phospholipids found in cell membranes and secondary metabolites that make cell membranes, the genetic material in the body, and fatty acids with a low melting point are glycerides of fatty acids.

Complete answer:
Lipids are generally water-insoluble which could be simple fatty acids that contain a carboxyl group attached to an R group. Fatty acids can be without double-bond (saturated) or with double bonds (unsaturated). Phosphorus and a phosphorylated organic compound are found in some fatty acids. These are phospholipids found in cell membranes. Lecithin is an example of phospholipids. Essential oils or vegetable oils obtained from lemongrass oils, groundnut, sunflower are also glycerides of fatty acids.

Additional information:
- A fatty acid has an R group which could be a methyl or ethyl or higher number ${ -CH }_{ 2 }$ groups attached to the carboxyl group
- Fatty acids can be without double-bond (saturated) or with double bonds (unsaturated)
- Glycerol is a simple lipid that is trihydroxy propane. Many lipids have both lipids and fatty acids.
- Fatty acids are found esterified with glycerol. They can be monosaccharides, diglycerides, and triglycerides.
- Based on the melting point, these are also called fats or oils
- When compared to fats, oils have a lower melting point.
- Phosphorus and phosphorylated organic compounds are found in some lipids. They are called phospholipids found in the cell membranes.

So, the correct answer is ‘all of the above’

Note:
-If a phospholipid group is also found esterified to the sugar, they are called nucleotides. -Adenosine, guanosine, thymidine, uridine, and cytidine are nucleotides.
-Nucleic acids like DNA and RNA consist of nucleotides only that function as genetic material.