Which Is True About Mediated Transport of Substances Across Cell

question 16

Multiple Choice

Which is true about mediated transport of substances across cell membranes?

• A)It involves a specific membrane protein that functions as a carrier molecule.
• B)It always involves the movement of substances against a concentration gradient.
• C)It is always directly coupled to the splitting of ATP molecules.
• D)There is no limit to how fast it can occur as the concentration gradient becomes larger.
• E)It is the main mechanism for transporting hydrophobic molecules across membranes.

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