Predict what amino acids line the inner channel of a protein
that transports protons (H⁺) across membranes compared
to the inner channel of a protein that transports a negatively
charged substance across membranes.

A.Both channels are lined with hydrophobic amino acids

B.Both channels are lined with hydrophilic amino acids

C.The H⁺ transporter’s inner channel is lined with
hydrophobic amino acids; the other transport protein’s inner
channel is lined with hydrophilic amino acids.

D.The H⁺ transporter’s inner channel is lined with
hydrophilic amino acids; the other transport protein is lined with
hydrophobic amino acids.

E.One cannot answer this question without knowing what the other
transported substance is.