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Lesson Worksheet: Oxidative Phosphorylation Biology

In this worksheet, we will practice describing the process of oxidative phosphorylation and recalling the products formed.

Q1:

What molecule acts as the final electron acceptor in the electron transport chain?

  • AHydrogen
  • BWater
  • COxygen
  • DATP
  • ENAD

Q2:

Which of the following best describes oxidative phosphorylation?

  • AThe formation of ATP via the phosphorylation of coenzymes NAD and FAD
  • BThe process by which electrons move down an electron transport chain, resulting in the formation of ATP from ADP
  • CThe process by which electrons are released from reduced coenzymes in the mitochondrial matrix
  • DThe active transport of hydrogen ions from the intermembrane space into the mitochondrial matrix

Q3:

During oxidative phosphorylation, by what method of transport are hydrogen ions moved from the mitochondrial matrix to the intermembrane space?

  • AActive transport
  • BSimple diffusion
  • CFacilitated diffusion
  • DOsmosis

Q4:

Hydrogen ions move from the intermembrane space to the mitochondrial matrix by facilitated diffusion through an enzyme called ATP synthase. What is produced when this happens?

  • AADP and oxygen
  • BATP and carbon dioxide
  • CATP
  • DADP
  • EPhosphorylated NAD

Q5:

Why is oxidative phosphorylation considered an aerobic stage of respiration?

  • AIt can only happen in the presence of carbon dioxide.
  • BIt requires oxygen to be able to take place.
  • CIt produces oxygen as a by-product.
  • DEach stage of the reaction produces an oxidized molecule.

Q6:

Where in a cell, specifically, is the electron transport chain associated with oxidative phosphorylation located?

  • AThe mitochondrial matrix
  • BThe nuclear envelope
  • CThe outer membrane of the mitochondria
  • DThe ribosomes of the mitochondria
  • EThe inner membrane of the mitochondria

Q7:

Which of the following are products of oxidative phosphorylation?

  • ACarbon dioxide and ATP
  • BReduced NAD and FAD
  • CCarbon dioxide and water
  • DADP and oxygen
  • EATP and water

Q8:

Which of the following statements about the reactions in oxidative phosphorylation is correct?

  • ACoenzymes FAD and NAD are reduced.
  • BCoenzymes NADH and FADH2 are oxidized.
  • CCoenzymes NAD and FAD are phosphorylated.

Q9:

Assume oxidative phosphorylation is happening continuously in mitochondria. If the number of hydrogen ions in the intermembrane space significantly increases, what effect will this have?

  • AMore reduced NAD and FAD will be produced.
  • BFewer molecules of carbon dioxide will be released.
  • CMore ATP will be produced.
  • DLess ATP will be produced.

Q10:

Which of the following best describes the role of chemiosmosis in oxidative phosphorylation?

  • AChemiosmosis is the movement of electrons down their electrochemical gradient, which generates energy in the electron transport chain.
  • BChemiosmosis is the chemical breakdown of ATP into ADP and inorganic phosphate.
  • CChemiosmosis is the movement of chemicals dissolved in water down their concentration gradient, across the mitochondrial membrane.
  • DChemiosmosis is the chemical breakdown of water into hydrogen and oxygen ions at the final stage of the electron transport chain.
  • EChemiosmosis is the movement of ions down their electrochemical gradient, which generates ATP.

This lesson includes 26 additional questions for subscribers.

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