How does hydrolysis of ATP drive transport? A. ATP hydrolysis moves protons across the membrane and the proton-motive force is used to transport substances. B. The transport protein synthesizes ATP as it transports ions down their concentration gradient across the membrane. C. A phosphate group from ATP is added to a transport protein, changing its shape and facilitating transport. D. Transport cannot be driven by ATP hydrolysis-substances are transported through channels in channel proteins.

Question

Biology

Brynlee Schultz

30 May, 09:01

How does hydrolysis of ATP drive transport? A. ATP hydrolysis moves protons across the membrane and the proton-motive force is used to transport substances. B. The transport protein synthesizes ATP as it transports ions down their concentration gradient across the membrane. C. A phosphate group from ATP is added to a transport protein, changing its shape and facilitating transport. D. Transport cannot be driven by ATP hydrolysis-substances are transported through channels in channel proteins.

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Saul Le · Answer 1

C. A phosphate group from ATP is added to a transport protein, changing its shape and facilitating transport.

Explanation:

ATP hydrolysis drives the active transport of substances through membrane proteins. During the process, the released phosphate group from ATP is added to the nucleotide-binding site present on the membrane protein to trigger a conformational change in it.

For example, the binding of a phosphate group from ATP to the nucleotide-binding site of NA-K + ATPase brings about a conformational change in the protein. The phosphorylates pump has more affinity for K + and lower affinity for Na+. It facilitates the release of bound Na + from one side of the membrane to another.