Question

1. Which of the following statements is tru questions (3 pts each) statements is true about the proton motive force (pmf)? My answer is (a) provides the free energy for substrate level phosphorylation (b) decreases as NADH oxidation increases (c) increases as ATP synthesis increases (d) is the difference in the concentration of proton rence in the concentration of proton across the inner membrane of mitochondria 2. Which of the following is true for both FAD and coenzyme Q? My answer is_ (a) Both are electron carriers of the ETC that only accept and transfer electrons, not accepting hydrogen. (b) Both are electron carriers that can accept one electron at one time. (c) Both are soluble proteins in the matrix of mitochondria. (d) Both are enzymes of the ETC. 3. Which reaction shown below is a decarboxylation of a a-keto acid? My answer is_ SO orans - - - 0 ndon . O=C= no --OH CH.CH CH OH RESO om man GYM O=C= 0 . Hon slidem badoo CH.CH ayon H-C=0 -.-OH -- = == онон H----OH H-6-OH CH OH H-C=0 нон H- OH

Answer 1

Answer

1) D) is the difference in the concentration of proton across inner membrane of mitochondria

Explanation : It is this electron motive force developed as result of accumulation of H+ ions in the intermitochondrial space which creates proton gradient. This gradient is utilised by the ATP synthase enzyme to generate ATP

2) b) both are electron carriers that can accept one electron at one time

Explanation : FAD+ can accept electron and Hydrogen to form FADH2

3) A)

Explanation : Oxidative decarboxylatio of alpha keto acid occurs.