What Would Be the Outcome If the Pump Protein Shown

Multiple Choice

What would be the outcome if the pump protein shown in Fig. 5.13a instead acted as a carrier that allowed protons to move from the extracellular fluid into the cytoplasm?

A) The proton electrochemical gradient would be reversed.
B) ATP could be synthesized from ADP + P_i.
C) The number of protons on either side of the membrane would equalize.
D) ATP could be synthesized from ADP + P_i and the number of protons on either side of the membrane would equalize.