Question

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what is the key role (function) of carbohydrates?
genetic information (heredity)
instant energy for cells and body functions
immunity, muscles, structure for tissues, cell metabolism
energy storage

Explanation:

To determine the key role of carbohydrates, we analyze each option:

• "genetic information (heredity)" is the role of nucleic acids, not carbohydrates.
• "instant energy for cells and body functions" is a primary function of carbohydrates, as they are broken down quickly to provide energy.
• "immunity, muscles, structure for tissues, cell metabolism" describes proteins.
• "energy storage" is more associated with lipids (like fats) and some complex carbs (but the key immediate role is energy provision, not just storage).

Answer:

B. instant energy for cells and body functions