Question

a protein that has been transported past the outer chloroplast membrane would have to pass how many more membranes to reach the stroma and thylakoid lumen, respectively? multiple choice 4 2 1 3

Explanation:

Chloroplasts have a double - membrane envelope (outer and inner). To reach the stroma from outside the outer membrane, after passing the outer membrane, one more (the inner membrane) needs to be passed. To reach the thylakoid lumen from the stroma, one more membrane (the thylakoid membrane) needs to be passed. So in total, 2 more membranes are needed to reach the thylakoid lumen after passing the outer chloroplast membrane.

Answer:

2