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.

Question

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.

Quizplus · Accepted Answer

Chloroplasts set up their H? gradients across the membranes of their thylakoids, unique compartments not found in mitochondria. ATP hydrolysis by chaperones in both organelles (as well as GTP hydrolysis by the TOC complex of chloroplasts) drives protein import in these organelles.

Indicate Whether Each of the Following Descriptions Refers to Protein