In nutrition terms, what are the basic energy-providing molecules that plants and animals use as fuel?

In nutrition terms, what are the basic energy-providing molecules that plants and animals use as fuel?

• A. Carbohydrates
• B. Proteins
• C. Fats
• D. Vitamins

Answer: (A)

Carbohydrates provide the body's quick, readily available fuel. When consumed, they’re converted to glucose, which cells burn to produce ATP through glycolysis and the citric acid cycle. This makes carbohydrates the primary energy-providing molecules for both plants and animals. Fats offer a lot of energy too but require more steps to release it, and proteins are used mainly for building tissues and only supply energy under certain conditions. Vitamins aren’t energy sources; they support metabolism. So, the basic energy-providing fuel is carbohydrates.

Carbohydrates provide the body's quick, readily available fuel. When consumed, they’re converted to glucose, which cells burn to produce ATP through glycolysis and the citric acid cycle. This makes carbohydrates the primary energy-providing molecules for both plants and animals. Fats offer a lot of energy too but require more steps to release it, and proteins are used mainly for building tissues and only supply energy under certain conditions. Vitamins aren’t energy sources; they support metabolism. So, the basic energy-providing fuel is carbohydrates.