Carrier-Mediated Transport Is Necessary When

question 59

Multiple Choice

Carrier-mediated transport is necessary when

• A) diffusion will not allow adequate amounts of a substance to enter the cell.
• B) movement into the cell is against a concentration gradient.
• C) the level of nutrients in nature is very low.
• D) nutrient concentration is very low in the environment, is higher inside of the cell, or diffusion is not possible.

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