TCA Cycle

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TCA Cycle MCQ & Objective Questions

The TCA Cycle, also known as the Krebs Cycle, is a fundamental concept in biochemistry that plays a crucial role in cellular respiration. Understanding this cycle is essential for students preparing for school exams and competitive tests. Practicing MCQs and objective questions on the TCA Cycle not only enhances your grasp of the topic but also boosts your confidence, helping you score better in exams.

What You Will Practise Here

  • Key steps of the TCA Cycle and their significance
  • Important enzymes involved in the cycle
  • Energy yield from each turn of the TCA Cycle
  • Connection between the TCA Cycle and other metabolic pathways
  • Diagrams illustrating the TCA Cycle
  • Common substrates and products of the cycle
  • Real-life applications of the TCA Cycle in health and disease

Exam Relevance

The TCA Cycle is a recurring topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of the cycle's steps, its importance in metabolism, and its interconnections with other biochemical pathways. Common question patterns include multiple-choice questions that require identification of enzymes, substrates, or the energy produced during the cycle.

Common Mistakes Students Make

  • Confusing the substrates and products of the TCA Cycle
  • Overlooking the role of specific enzymes in the cycle
  • Misunderstanding the energy yield calculations
  • Neglecting the connections between the TCA Cycle and glycolysis
  • Failing to interpret diagrams accurately

FAQs

Question: What is the main function of the TCA Cycle?
Answer: The main function of the TCA Cycle is to generate energy through the oxidation of acetyl-CoA, producing ATP, NADH, and FADH2.

Question: How does the TCA Cycle relate to aerobic respiration?
Answer: The TCA Cycle is a key component of aerobic respiration, as it occurs in the mitochondria and contributes to the production of energy carriers that are used in the electron transport chain.

Start your journey towards mastering the TCA Cycle today! Solve practice MCQs and test your understanding to excel in your exams. Remember, consistent practice is the key to success!

Q. What is produced during the decarboxylation of isocitrate?
  • A. NADH and CO2
  • B. FADH2 and CO2
  • C. ATP and CO2
  • D. GTP and CO2
Q. What is the primary function of the TCA cycle?
  • A. Fatty acid synthesis
  • B. Amino acid degradation
  • C. Energy production through oxidation of acetyl-CoA
  • D. Nucleotide synthesis
Q. What role does NAD+ play in the TCA cycle?
  • A. It acts as a substrate
  • B. It is a coenzyme that accepts electrons
  • C. It is produced during the cycle
  • D. It inhibits the cycle
Q. Which compound is regenerated at the end of the TCA cycle?
  • A. Acetyl-CoA
  • B. Citrate
  • C. Oxaloacetate
  • D. Alpha-ketoglutarate
Q. Which enzyme catalyzes the conversion of citrate to isocitrate?
  • A. Citrate synthase
  • B. Aconitase
  • C. Isocitrate dehydrogenase
  • D. Alpha-ketoglutarate dehydrogenase
Q. Which molecule is the starting substrate for the TCA cycle?
  • A. Pyruvate
  • B. Acetyl-CoA
  • C. Oxaloacetate
  • D. Citrate
Q. Which of the following is NOT a product of the TCA cycle?
  • A. NADH
  • B. FADH2
  • C. ATP
  • D. Glucose
Q. Which step of the TCA cycle produces FADH2?
  • A. Conversion of succinate to fumarate
  • B. Conversion of isocitrate to alpha-ketoglutarate
  • C. Conversion of malate to oxaloacetate
  • D. Conversion of citrate to isocitrate
Q. Which vitamin is a precursor for the coenzyme involved in the TCA cycle?
  • A. Vitamin C
  • B. Vitamin B1
  • C. Vitamin B2
  • D. Vitamin B3
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