What Is the Difference Between the Processes of Nutrient Absorption

question 13

Multiple Choice

What is the difference between the processes of nutrient absorption by simple diffusion versus active transport?

• A)Nutrients absorbed by active transport cross freely into intestinal cells, while nutrients absorbed by simple diffusion move against their concentration gradient, which requires energy.
• B)Nutrients absorbed by simple diffusion cross freely into intestinal cells, while nutrients absorbed by active transport move against their concentration gradient, which requires energy.
• C)Nutrients absorbed by simple diffusion need a specific carrier molecule to transport them into intestinal cells, while nutrients absorbed by active transport move against their concentration gradient, which does not require energy.
• D)Nutrients absorbed by simple diffusion cross freely into intestinal cells, while nutrients absorbed by active transport need a specific carrier molecule to transport them into intestinal cells, which does not require energy.

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Definitions:

Goblet Cells

Epithelial cells that secrete mucus to lubricate surfaces such as the inside of the intestinal and respiratory tracts.

Tight Junction

A tightly sealed point of contact between two cells, preventing the passage of substances between the cells.

Plasma Membranes

A pair of lipid layers that forms a barrier around the cell's cytoplasm, controlling the import and export of cellular materials.

Adhesion Belt

A protein complex located just below the tight junctions in epithelial cells, contributing to the formation of an adhesive junction that holds cells together.