In the Mitochondria Phosphate Ion (PO4³-)And H+ Are Transported Together

Multiple Choice

In the mitochondria phosphate ion (PO4³-) and H+ are transported together from the intermembrane space into the matrix.Which statement applies?

A) The transport protein is a symport.
B) The transport protein must have a relatively large central channel to accommodate both ions.
C) The interior of the transport protein must be uncharged.
D) All of the above.