Question

C. Considering Electron Transport: In LA3 Video 3, we are considering electron transport and oxidative phosphorylation. Please answer the following multiple choice questions (0.5 pts each) and follow instructions for two final drawings (2 pts each). 1. The electrons involved in electron transport come from (A) glycolysis (B) the pyruvate dehydrogenase complex (C) the citric acid cycle (D) all three processes 2. When NADH and FADH2 transfer their electrons to the electron transport chain, they are (A) oxidized (B) epimerized (C) reduced (D) degraded 3. As electrons are transferred within complexes, are transported out of the (A) HCO,' ; outer mitochondrial membrane (C) H ; inner mitochondrial membrane (B) H'; outer mitochondrial membrane (D) ADP; inner mitochondrial membrane 4. NADH generated from glycolysis (A) is transported as intact NADH into the mitochondria for electron transport (B) can be involved in the malate-aspartate shuttle so that reducing equivalents can be transported into the mitochondrion (C) is already in the mitochondrion because all glycolysis occurs in the mitochondrion. 5. How many protons are transported out of the inner mitochondrial membrane when two electrons are transported from NADH to Coenzyme Q through Complex 1? (A) (B) 1 (C)2 (D) 4 (E) 6 6. How many protons are transported out of the inner mitochondrial membrane when two electrons are transported from FADH2 to Coenzyme Q through Complex Il? (A) (B)1 (C)2 (D) 4 (E) 6 7. At the end of electron transport, 4 electrons are transported from cytochrome Cone at a time to and through Complex IV. From these 4 electrons, (i) how many protons are pulled from the mitochondrial matrix and (if how many are transferred through to the intermembrane space? (A) 2 & 2 (B)4&2 (C) 4 & 4 (D) 8 & 4 (E) 8 & 8

Answer 1

1. D, electrons come from all 3 processes

2. A, oxidized

3. C, H+ transported out of the inner membrane

4. B, can be involved in malate-aspartate shuttle so that reducing equivalents can be transported into the mitochondria

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