Question

1. Which statement comparing chloroplasts and mitochondria is true?

	Chloroplasts and mitochondria each contain two membranes.
	None of these statements are true.
	Chloroplasts pump protons outside the organelle, while mitochondria pump protons inside the inner part of the organelle.
	Chloroplasts and mitochondria use electrons from NADH to create a proton gradient.
	Chloroplasts and mitochondria use energy from a proton gradient to make ATP.

2. Approximately how many more ATPs are made from one glucose molecule under aerobic conditions with oxidative phosphorylation than under anaerobic conditions?

	104
	0
	2
	30

3. As a cyclic pathway, why doens't the citrate cycle stop functioning when citrate cycle intermediates are siphoned off for use by other pathways?

	Heme degradation produces succinyl-CoA, which is sufficient to restore the downstream citrate cycle intermediates that may be lacking.
	Citrate cycle intermediates are constantly imported into the mitochondria from the cytosol, so these metabolites are never in low abundance.
	Anaplerotic reactions catalyze the formation of citrate cycle intermediates, which can then enter the citrate cycle and maintain a functioning pathway.
	Oxaloacetate is the only citrate cycle intermediate that leaves the pathway, and it is replenished by pyruvate carboxylase.