Which of the following does NOT help explain why the theoretical yield of cellular respiration is never actually achieved?

W) Pyruvate [py-ROO-vayt] must be actively transported out of the mitochondria [my-tuh-KON-dree-uh]

X) Phosphate is actively transported into the mitochondria

Y) ADP and ATP are actively exchanged across the inner mitochondrial membrane

Z) The inner mitochondrial membrane leaks protons
W) PYRUVATE MUST BE ACTIVELY TRANSPORTED OUT OF THE MITOCHONDRIA