Which type of nutrient functions primarily as an energy source for cells in organic chemistry?

• A. Minerals
• B. Proteins
• C. Vitamins
• D. $\mathrm{Carbohydrates}$

Answer: (D)

Verified step by step guidance

1. Identify the primary function of each nutrient type listed: Minerals, Proteins, Vitamins, and Carbohydrates.
2. Understand that minerals are inorganic elements that play various roles in the body, such as building strong bones and teeth, and are not primarily used for energy.
3. Recognize that proteins are made up of amino acids and are primarily used for building and repairing tissues, although they can be used for energy in certain conditions.
4. Acknowledge that vitamins are organic compounds that are crucial for various biochemical functions but do not provide energy directly.
5. Carbohydrates are organic compounds consisting of carbon, hydrogen, and oxygen, and are the body's main source of energy, as they are broken down into glucose, which is used in cellular respiration to produce ATP, the energy currency of the cell.