Question

carbohydrates are biological molecules made of carbon, hydrogen, and oxygen. there are different types of carbohydrate molecules, each with unique functions in living things. select the true statements. humans consume carbohydrates through foods like bread, pasta, and bananas. carbohydrates are the primary energy source for the human body. disaccharides are large molecules made of hundreds of repeating units. some carbohydrates are used to store excess glucose in plant and animal cells.

Explanation:

• For option A: Bread (grains), pasta (grains), and bananas are known to be rich in carbohydrates, so this is true.
• For option B: Carbohydrates are indeed the main energy source for the human body (e.g., glucose from carbs is used in cellular respiration).
• For option C: Disaccharides are made of 2 sugar units (e.g., sucrose = glucose + fructose), while “hundreds of repeating units” describes polysaccharides (e.g., starch, glycogen). Thus, this is false.
• For option D: Plants store excess glucose as starch, animals as glycogen—both are carbohydrates, so this is true.

Answer:

A. Humans consume carbohydrates through foods like bread, pasta, and bananas.
B. Carbohydrates are the primary energy source for the human body.
D. Some carbohydrates are used to store excess glucose in plant and animal cells.