Question

Which of the following is not true of both triglycerides and phospholipids?

a. They both contain glycerol.
b. They both contain fatty acids.
c. They both contain a hydrophobic and hydrophilic end.
d. All of the above are true of both triglycerides and phospholipids.

Answer 1

Triglycerides and phospholipids both contain glycerol and fatty acids, but phospholipids also have a phosphate group and a polar head region. This makes option d, 'All of the above are true of both triglycerides and phospholipids,' incorrect.

Step-by-step explanation:

Phospholipids and triglycerides have some similarities in structure but differ in certain aspects. Both triglycerides and phospholipids contain glycerol as a component and fatty acids attached to it. However, phospholipids have an additional phosphate group and a polar head region, making them different from triglycerides. This means that option d, 'All of the above are true of both triglycerides and phospholipids,' is not true. Phospholipids have a hydrophobic (nonpolar) tail made up of fatty acids and a hydrophilic (polar) head that contains charges on the phosphate groups and nitrogen atom. This structure allows phospholipids to form the basis of cell membranes.