Biology

The correct answer is: D.ATP provides energy to change the shape of carrier proteins.

Explanation:

In active transport, ATP is used to provide energy for transport proteins (such as pumps) to move molecules across the cell membrane against their concentration gradient (from lower to higher concentration). The energy from ATP is required to change the shape of the carrier proteins, allowing them to transport molecules in and out of the cell.

A.ATP helps molecules bind to receptor proteins: This is incorrect. ATP does not directly help molecules bind to receptor proteins; receptors are typically involved in signaling or recognition, not energy transfer.

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