Which complex of the mitochondrial electron transport chain accepts electrons directly from NADH (the reduced form of nicotinamide adenine dinucleotide)? NADH dehydrogenase (complex I) FADH2 dehydrogenase (complex II) cytochrome b-c1 (complex III) cytochrome c oxidase (complex IV) the ATP synthase complex Chapter 14, Pg. 78
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Which complex of the mitochondrial electron transport chain accepts electrons directly from NADH (the reduced form of nicotinamide adenine dinucleotide)?
- NADH dehydrogenase (complex I)
- FADH2 dehydrogenase (complex II)
- cytochrome b-c1 (complex III)
- cytochrome c oxidase (complex IV)
- the ATP synthase complex
Chapter 14, Pg. 78
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- Which complex of the mitochondrial electron transport chain is the only one able to accept electrons directly from FADH2? NADH dehydrogenase (complex I) cytochrome b-c1 (complex III) cytochrome c oxidase (complex IV) the ATP synthase complex FADH2 dehydrogenase (complex II) The above reaction (FADH2 donating its electrons to the electron transport chain) takes place in which of the following eukaryotic cell locations? the mitochondrial matrix the thylakoid membrane of chloroplasts the chloroplast stroma the inner mitochondrial membrane the cytoplasmWhich complex of the mitochondrial electron transport chain accepts electrons directly from NADH (the reduced form of nicotinamide adenine dinucleotide)? NADH dehydrogenase (complex I) FADH2 dehydrogenase (complex II) cytochrome b-c1 (complex III) cytochrome c oxidase (complex IV) the ATP synthase complexThe toxicity of cyanide (CN-) results from its binding to the iron atoms of the cytochrome aa3 (complex IV) and subsequent inhibition of mitochondrial electron transport. How does this cyanide–iron complex prevent oxygen from accepting electrons from the electron transport chain?
- The four complexes of the electron transport chain use the energy of electrons stored in reducing agents to create a concentration gradient of protons (H*) across the mitochondrial inner membrane. Give the number of protons pumped into the intermembrane space by each of the four complexes: complex I: complex II: complex III: complex IV:Where is ATP produced by oxidative phosphorylation? (where is it located immediately after the moment of synthesis) Group of answer choices the mitochondrial matrix the cytoplasm the intermembrane space the inner mitochondrial membrane Which of the following most readily donates electrons? (strongest reducing agent) Group of answer choices NADH NAD+ Ubiquinone lactate Protons first enter ATP synthase through which subunit? Group of answer choices β c γ aAll of the following components of the mitochondrial electron transport chain contain several nitrogen atoms, with the exception of: the cytochrome b-c1 complex the cytochrome c oxidase complex coenzyme Q (ubiquinone) the cytochrome a-a3 complex cytochrome c The most common enzyme in nature, used during the Calvin cycle, is called: ribulose bisphosphate carboxylase FADH2 dehydrogenase NADH dehydrogenase chlorophyll a chlorophyll b
- Why does mitochondrial NADH yields more ATPs than cytosolic NADH?An important function of the inner mitochondrial membrane is to provide a selectively permeable barrier to the movement of water soluble molecules and thus to generate different chemical environments on either side of the mem- brane. However, many of the substrates and products of oxidative phosphorylation are water soluble and must cross the inner membrane. How does this transport occur?Carbon monoxide is considered toxic because it acts on Complex IV. How would the addition of carbon monoxide to actively respiring mitochondria affect the relative oxidation-reduction states of all components of the electron-transport chain? Complexes I and I would be reduced, but complexes II and IV would be oxidized because the electrons come from FADH2 oxidation, not NADH. O All four complexes would remain oxidized because they function as a multisystem complex. O Complexes I, II, and I would be reduced and Complex IV would be oxidized. All four complexes would remain reduced because they function as a multisystem complex Complexes I, II, and ill would be oxidized but Complex IV would remain reduced.
- Referring to the figure below, explain why NADH yields more ATP than FADH2 does. Electron-transport and proton pump Oxidative phosphorylation Outer mitochondrial membrane H* -Intermembrane H+ H+ H+ space H* H+ H+ Cytochrome c H+ COQH, CoQ UU COQH2 CoQ JU U Inner mitochondrial membrane Ht e ATPase Complex II Complex II Complex IV Complex e ADP +P - Mitochondrial matrix NADH NAD+ FADH2 FAD АТР H+ -H+ H+ H20What is the major route for protons moving from the inter membrane space back into the mitochondrial matrix during oxidative phosphorylation? 1. Protons carried across the membrane by a molecule of dinitrophenol 2. Protons are transported along with ADP by the ATP/ADP translocase.3. Protons enter the half channel in subunit a facing the inter membrane space and exit via the half channel facing the mitochondrial matrix. Choose 1 correct answer explain? Give typing answer with explanation and conclusionOxidation of NADH and FADH2 in the electron transport system are similar in that: (READ THESE ANSWER CHOICES CAREFULLY!) a Both give their electrons to Complex I. b Both give their electrons directly to Ubiquinone (CoQ). c Both require Ubiquinone, Complex III, Cytochrome C, and Complex IV, ultimately resulting in reduction of O2 d Both result in pumping of H+ from the intermembrane space to the mitochondrial matrix.