BIOMOLECULES AND ENZYMES

Detailed explanation-1: -On average carbohydrates and proteins yield 4 Calories per gram while lipids yield 9 Calories per gram. This is why animals tend to store extra calories as lipids and not proteins or carbohydrates, fat storage is more efficient, resulting in a smaller increase in mass.

Detailed explanation-2: -Triglycerides. The major lipids in food and stored in the body as fat are the triglycerides, which consist of three fatty acids attached to a backbone of glycerol (an alcohol).

Detailed explanation-3: -Lipids are fats, and they provide the body with nine calories per gram, making them the most energy rich component of food. Lipids are different from carbohydrates and proteins because they do not dissolve in water.

Detailed explanation-4: -Fat has more than twice as many calories per gram as carbohydrates and proteins. A gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories. In other words, you could eat twice as much carbohydrates or proteins as fat for the same amount of calories.