Question

a scientist observes that the epithelial cells lining the small intestine have numerous microvilli, which are tiny, finger - like projections. which statement best explains this observation in the context of the structure - function principle in biological organization? select one microvilli primarily function to protect the intestinal lining from bacterial infections unrelated to the presence of microvilli is an adaptation for increasing the surface area for efficient nutrient

Explanation:

The structure - function principle in biology states that the form of a structure (here, the microvilli) is related to its function. Microvilli are tiny projections. In the small intestine, the main function is nutrient absorption. Increasing the surface area (by having microvilli) allows for more efficient absorption of nutrients. Option 1 is incorrect as protection from bacterial infections is not the main function related to microvilli in the context of the structure - function principle for nutrient absorption. Option 2 correctly links the structure (microvilli increasing surface area) to the function (efficient nutrient absorption).

Answer:

1. The presence of microvilli is an adaptation for increasing the surface area for efficient nutrient