Understanding the TCA Cycle

Understanding the TCA Cycle

12th Grade

15 Qs

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Understanding the TCA Cycle

Understanding the TCA Cycle

Assessment

Quiz

English

12th Grade

Practice Problem

Easy

Created by

Sarawak Culture

Used 2+ times

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15 questions

Show all answers

1.

OPEN ENDED QUESTION

3 mins • 1 pt

Is there "substrate level" phosphorylation in TCA cycle?

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Answer explanation

Yes, there is substrate-level phosphorylation in the TCA cycle. Specifically, it occurs during the conversion of succinyl-CoA to succinate, where GTP (or ATP) is produced directly.

2.

OPEN ENDED QUESTION

3 mins • 1 pt

What happens to Pyruvate?

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Answer explanation

Pyruvate can undergo different fates: it is converted to acetyl-CoA for entry into the Krebs cycle under aerobic conditions, or it is reduced to lactate in anaerobic conditions, allowing for continued ATP production.

3.

OPEN ENDED QUESTION

3 mins • 1 pt

Conversion of pyruvate to acetyl-CoA

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Answer explanation

The conversion of pyruvate to acetyl-CoA occurs in the mitochondria, catalyzed by the pyruvate dehydrogenase complex. This process involves decarboxylation and the reduction of NAD+, producing CO2 and NADH.

4.

OPEN ENDED QUESTION

3 mins • 1 pt

The citric acid cycle (CAC) also known as the TCA cycle or the Krebs cycle

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Answer explanation

The citric acid cycle, also known as the TCA cycle or Krebs cycle, is a key metabolic pathway that plays a crucial role in cellular respiration, converting carbohydrates, fats, and proteins into carbon dioxide and water, while generating energy.

5.

OPEN ENDED QUESTION

3 mins • 1 pt

Each step in the cycle (including the link reaction → conversion of pyruvate to acetyl-CoA) occurs TWICE for every glucose molecule.

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Answer explanation

Each glucose molecule produces two pyruvate molecules during glycolysis. Therefore, the subsequent steps, including the link reaction, occur twice to process both pyruvate molecules into acetyl-CoA.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the product of glycolysis that enters the TCA cycle?

(S)-citryl-CoA

Citrate

Isocitrate

α-Ketoglutarate

Answer explanation

The product of glycolysis that enters the TCA cycle is (S)-citryl-CoA, formed when acetyl-CoA combines with oxaloacetate. Citrate is produced subsequently, but (S)-citryl-CoA is the direct entry product.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which enzyme catalyzes the reaction of citrate to isocitrate?

Citrate synthase

Aconitase

Isocitrate dehydrogenase

Succinyl-CoA synthetase

Answer explanation

Aconitase is the enzyme that catalyzes the conversion of citrate to isocitrate in the citric acid cycle, facilitating the isomerization of citrate.

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