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Carbohydrates are absorbed as monosaccharides (simple sugars such as glucose, fructose, and galactose that cannot be further broken down by hydrolysis) or as disaccharides (such as sucrose, lactose, maltose, and dextrin that can be hydrolyzed to two monosaccharides).

1. These simpler molecules, however, must be obtained by active absorption.
2. Facilitated transport is a form of passive transport in which materials are moved across the plasma membrane by a transport protein down their concentration gradient.
3. It does not require energy.
4. Small intestine is major area of absorption of nutrients.

Correct answer: Facilitated transport is a form of passive transport in which materials are moved across the plasma membrane by a transport protein down their concentration gradient.

Solution

Facilitated transport is passive because substances move down their concentration gradient and do not require ATP. It still uses a membrane transport protein, which distinguishes it from simple diffusion.

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