Indicate whether each of the following descriptions refers to protein import into mitochondria (M), chloroplasts (C), or both (B). Your answer would be a five-letter string composed of letters M, C, and B only, e.g. BBBMC.
( ) ATP and GTP hydrolysis drive translocation into the organelle.
( ) The organelle has an extra compartment that requires extra signal sequences for protein targeting.
( ) Transport through the double membrane is driven in part by an H? gradient across the inner membrane.
( ) Imported precursor proteins have amphiphilic N-terminal signal sequences that are usually removed after use.
( ) Hsp70 family chaperones inside the organelle assist in protein translocation during import.