Bio1332 Biochemistry - Lecture Seventeen - The Citric Acid Cycle

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Bio1332 Biochemistry - Lecture Seventeen - The Citric Acid Cycle - Quiz

 1. Understand and reproduce key reactions of the citric acid cycle cycle  2. Understand the reaction points that liberate NADH and FADH2  3. Understand the key control points  4. Understand related pathways

Questions and Answers
  • 1. 

    Give an alternate name for the citric acid cycle.

    The correct answer is "The Krebs Cycle" because it is the most commonly used and widely recognized alternate name for the citric acid cycle. It is named after its discoverer, Hans Krebs, who elucidated the key reactions and steps involved in this metabolic pathway. Other names such as "Krebs Cycle," "The Kreb Cycle," "Kreb Cycle," "The Tricarboxylic Acid Cycle," "Tricarboxylic Acid Cycle," "TCA Cycle," and "TCA" are also valid alternate names for the citric acid cycle.

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  • 2. 

    Where specifically does the Citric Acid Cycle occur?

    The Citric Acid Cycle specifically occurs in the matrix of the mitochondria.

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  • 3. 

    In the Citric Acid Cycle, what is Pyruvate converted into?

    In the Citric Acid Cycle, pyruvate is converted into Acetylcoenzyme A, also known as Acetyl coenzyme A or Acetyl CoA. This process occurs in the mitochondria and is a crucial step in the metabolism of carbohydrates and fats. Acetyl CoA then enters the next stage of the cycle, where it is further broken down to produce energy in the form of ATP.

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  • 4. 

    Name the enzyme that converts pyruvate into Acetyl CoA.

    Pyruvate Dehydrogenase is the enzyme responsible for converting pyruvate into Acetyl CoA. This enzyme plays a crucial role in the process of cellular respiration, specifically in the link reaction between glycolysis and the Krebs cycle. During this conversion, pyruvate undergoes decarboxylation and is transformed into Acetyl CoA, which is then utilized in the Krebs cycle to produce energy in the form of ATP. Pyruvate Dehydrogenase is a complex enzyme consisting of multiple subunits and requires various cofactors for its activity.

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