Question

multiple choice question
examine this image of a carrier protein transporting a solute across the plasma membrane.
which of the following statements is false?

• the carrier protein is an integral membrane protein.
• the atp required for transport is hydrolyzed on the cytoplasmic face of the carrier protein.
• the carrier protein has two conformations, one open to the environment, and the other open to the cytoplasm.

Explanation:

1. Analyze the first option: Integral membrane proteins span the membrane, and carrier proteins involved in transport are typically integral, so this is true.
2. Analyze the second option: The image shows facilitated diffusion (movement down concentration gradient, no ATP hydrolysis indicated as there's no energy input shown). So stating ATP is hydrolyzed on the cytoplasmic face is false.
3. Analyze the third option: Carrier proteins change conformation, having one face open to outside and one to inside (cytoplasm) during transport, so this is true.

Answer:

The ATP required for transport is hydrolyzed on the cytoplasmic face of the carrier protein.