BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Unlike carbohydrates, protein, and fat; vitamins are not a source of energy, which explains why such a small amount is necessary. Vitamins are organic compounds like carbohydrate, protein, and fat, and they are also as essential as macronutrients for normal functioning, growth, and maintenance of the body.

Detailed explanation-2: -Of these six nutrients, carbohydrates, protein and fats provide calories. Each gram of carbohydrate and protein yield 4 calories/gram. Each gram of fat yields 9 calories.

Detailed explanation-3: -Fats are the slowest source of energy but the most energy-efficient form of food. Each gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates. Because fats are such an efficient form of energy, the body stores any excess energy as fat.