Indicate whether each of the following descriptions matches an ABC transporter (A), a P-type pump (P), or a V-type pump (V). Your answer would be a five-letter string composed of letters A, P, and V only, e.g. PPVVV.
( ) The pumps in this family are phosphorylated at a key Asp residue in each transport cycle.
( ) This family is the largest among membrane transport proteins and includes some channels as well as pumps.
( ) The pumps in this family are responsible for the acidification of synaptic vesicles.
( ) The sodium-potassium pump is a member of this family.
( ) The multidrug resistance protein is a member of this family.