Krebs Cycle & Electron Transport Chain

This quiz covers acetyl-CoA formation, Krebs cycle byproducts, oxidative phosphorylation, cytochromes, and the overall aerobic equation

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Views #: 212

Questions #: 11

Time: 9 minutes

Pass Score: 80.0%

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Where Aerobic Respiration of Pyruvate Occurs

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The aerobic respiration of pyruvate occurs within the:

Nucleus

Mitochondria

Lysosomes

Golgi bodies

Cytoplasm

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Naming the Cycle That Breaks Down Acetate

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With the aid of a complex of enzymes found in the mitochondrial matrix, acetate is broken down through a long series of chemical reactions known as:

Oxidation

The Krebs cycle

Osmosis

Deamination

The mitochondrial cycle

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What Enters the Krebs Cycle

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Based on the diagram, what molecule, formed when coenzyme A attaches to acetate, enters the Krebs cycle?

Pyruvate

NADH2

ATP

Acetyl-CoA

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Key Byproducts of the Krebs Cycle

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During the Krebs cycle, the most important byproducts are ATP and several hydrogen-carrier molecules, including (1) and some (2).

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FADH2

lactate

NADH

pyruvate

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Naming the Final Phase of Aerobic Respiration

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In the final stage of glucose oxidation, high-energy electrons are passed in a controlled series of steps to lower-energy-level electron carriers, with a small amount of energy released at each step to form ATP. This phase of aerobic respiration is known as:

The citric acid cycle

Anaerobic fermentation

The tricarboxylic acid cycle

The Krebs cycle

Oxidative phosphorylation

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Naming the Series of Electron Carriers

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The NADH and FADH2 released during the Krebs cycle are transported to a series of electron carriers in the cristae of the mitochondria. What is this series of carriers called?

Deamination

The electron transport chain

The citric acid cycle

Amination

The tricarboxylic cycle

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What Happens to Electrons at the End of the Chain

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At the end of the electron transport chain, electrons are accepted by (1) atoms, which combine with hydrogen ions to produce (2).

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oxygen

nitrogen

carbon dioxide

water

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The Iron-Containing Carrier Proteins

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What are the iron-containing protein molecules that make up the main components of the electron transport chain called?

Cytochromes

Cytokines

Chromatids

Coenzymes

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ATP Yield with the Krebs Cycle

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True or False: The development of the Krebs cycle increased the total number of ATPs that could be produced from glucose breakdown to 38.

True

False

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The Overall Aerobic Respiration Equation

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Which equation correctly summarizes aerobic respiration?

\(\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{energy}\)

\(\text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 2\text{C}_2\text{H}_5\text{OH} + 2\text{CO}_2\)

\(6\text{CO}_2 + 6\text{H}_2\text{O} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2\)

\(\text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 2\text{C}_2\text{H}_6\text{OH} + 3\text{CO}_2\)

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Classify: Krebs Cycle or Electron Transport Chain

2 pts

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Terms

×Final electron acceptor is oxygen, forming water

×Acetyl-CoA enters here

×Produces NADH and FADH2

×Cytochromes pass electrons stepwise

Krebs cycle

Electron transport chain

Sort each description into the correct stage of aerobic respiration

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Where Aerobic Respiration of Pyruvate Occurs

Correct Answer

Explanation

Naming the Cycle That Breaks Down Acetate

Correct Answer

Explanation

What Enters the Krebs Cycle

Correct Answer

Explanation

Key Byproducts of the Krebs Cycle

Correct Answer

Explanation

Naming the Final Phase of Aerobic Respiration

Correct Answer

Explanation

Naming the Series of Electron Carriers

Correct Answer

Explanation

What Happens to Electrons at the End of the Chain

Correct Answer

Explanation

The Iron-Containing Carrier Proteins

Correct Answer

Explanation

ATP Yield with the Krebs Cycle

Correct Answer

Explanation

The Overall Aerobic Respiration Equation

Correct Answer

Explanation

Classify: Krebs Cycle or Electron Transport Chain

Sort each description into the correct stage of aerobic respiration

Sort each description into the correct stage of aerobic respiration

Correct Answer

Explanation

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