Cellular Respiration: Three Main Stages

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Questions and Answers

Where does glycolysis take place?

  • Cytoplasm (correct)
  • Cell membrane
  • Endoplasmic reticulum
  • Nucleus

What is the end product of the Krebs Cycle?

  • Pyruvic acid
  • Glucose
  • There is no final end product (correct)
  • Citric acid

Where are the high-energy electrons passed to in the Electron Transport Chain?

  • Inner membrane of mitochondrion (correct)
  • Cell membrane
  • Nucleus
  • Endoplasmic reticulum

What is the first stage of glycolysis?

<p>Glucose (D)</p> Signup and view all the answers

Which of the following is NOT one of the main stages of cellular respiration?

<p>Fermentation (A)</p> Signup and view all the answers

Where does the Krebs Cycle take place?

<p>Mitochondrion (B)</p> Signup and view all the answers

Where does the electron transport chain (ETC) take place in eukaryotic cells?

<p>Inner mitochondrial membrane (C)</p> Signup and view all the answers

Which molecule donates high-energy electrons to the electron transport chain?

<p>NADH (B)</p> Signup and view all the answers

Which complex is the first protein complex in the electron transport chain, where NADH donates electrons?

<p>Complex I (NADH dehydrogenase) (B)</p> Signup and view all the answers

Which molecule accepts the electrons from Complex I and shuttles them to the next complex in the electron transport chain?

<p>Coenzyme Q (Ubiquinone) (A)</p> Signup and view all the answers

Which complex is directly associated with the citric acid cycle and can accept electrons from FADH₂?

<p>Complex II (Succinate Dehydrogenase) (C)</p> Signup and view all the answers

What is the final protein complex in the electron transport chain?

<p>Complex IV (Cytochrome c Oxidase) (D)</p> Signup and view all the answers

What is the terminal electron acceptor in the electron transport chain?

<p>$O_2$ (oxygen) (A)</p> Signup and view all the answers

What does ATP synthase use to synthesize ATP from ADP and inorganic phosphate?

<p>Proton gradient (D)</p> Signup and view all the answers

Where are protons actively pumped across during the electron transport chain, creating a proton gradient?

<p>Inner mitochondrial membrane (B)</p> Signup and view all the answers

Which molecule is a mobile electron carrier that accepts electrons from both Complex I and Complex II and shuttles them to the next complex?

<p>Coenzyme Q (Ubiquinone) (B)</p> Signup and view all the answers

Which stage of cellular respiration does not produce a final end product?

<p>Kreb’s Cycle (B)</p> Signup and view all the answers

In which organelle does the Krebs Cycle occur?

<p>Mitochondrion (D)</p> Signup and view all the answers

Where does glycolysis take place?

<p>Cytoplasm (A)</p> Signup and view all the answers

What is the role of NADH and FADH2 in cellular respiration?

<p>To accept high-energy electrons (A)</p> Signup and view all the answers

Where are the high-energy electrons passed to in the Electron Transport Chain?

<p>Inner membrane of mitochondrion (A)</p> Signup and view all the answers

What is the primary function of ATP synthase in cellular respiration?

<p>To convert ADP into ATP (C)</p> Signup and view all the answers

Which protein complex in the electron transport chain is directly associated with the citric acid cycle and can accept electrons from FADH₂?

<p>Complex II (C)</p> Signup and view all the answers

Where are protons actively pumped across during the electron transport chain, creating a proton gradient?

<p>Inner mitochondrial membrane (D)</p> Signup and view all the answers

Which molecule is a mobile electron carrier that accepts electrons from both Complex I and Complex II and shuttles them to the next complex in the electron transport chain?

<p>Coenzyme Q (Ubiquinone) (D)</p> Signup and view all the answers

What is the terminal electron acceptor in the electron transport chain?

<p>Oxygen (O₂) (D)</p> Signup and view all the answers

Where does the Krebs Cycle take place?

<p>Mitochondrial matrix (A)</p> Signup and view all the answers

What does ATP synthase use to synthesize ATP from ADP and inorganic phosphate?

<p>Protons (C)</p> Signup and view all the answers

Which of the following is NOT one of the main stages of cellular respiration?

<p>Photosynthesis (D)</p> Signup and view all the answers

Where does glycolysis take place?

<p>Cytosol (C)</p> Signup and view all the answers

Which complex is the first protein complex in the electron transport chain, where NADH donates electrons?

<p>Complex I (NADH Dehydrogenase) (C)</p> Signup and view all the answers

Where does the electron transport chain (ETC) take place in eukaryotic cells?

<p>Inner mitochondrial membrane (C)</p> Signup and view all the answers

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