Which of the Following Classes of Biological Compounds Can Be

Question

Which of the following classes of biological compounds can be used by the body as fuel?
A) only carbohydrates and lipids
B) only carbohydrates and proteins
C) only lipids and proteins
D) all of these

Accepted Answer

All three classes of biological compounds (carbohydrates, lipids, and proteins) can be used by the body as fuel through various metabolic pathways. Carbohydrates are the primary source of energy for many cells and are broken down into glucose. Lipids, such as fats, can be broken down into fatty acids and used for energy when glucose levels are low. Proteins can also be broken down into amino acids, which can be used for energy or for building new proteins. Therefore, all of these choices are correct.