Kaplan test 6 biological sciences number 7

[2010premed]

The respiratory chain electron carreier ubiquinone can accept electrons not only from NADH, but also from a krebs cycle intermediate called succinate. The presence of succinate in the mitochondrial matrix will:
A. lead to an increase in the number of H+ ions that are transported from the mitochondrial matrix to the intermembrane space
C. have no effect on the amount of ATP produced.

Answer: A

I put C b/c I thought that the krebs cyce takes place in the matrix of the mitochondria and therefore succinate should naturally be in there?

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[Rabolisk]

I think you read a little too much into this. The question was just trying to test the connection between electron transport chain, H+ ions, and ATP production. More electrons being "transported" in the chain = more H+ ions = more proton gradient = more ATP produced.

 

[2010premed]

Thanks, that helps