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Citric Acid Cycle

Authored by Jean Aplasca

University

15 Questions

Used 2K+ times

Citric Acid Cycle
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About

This quiz comprehensively covers the Citric Acid Cycle (also known as Krebs Cycle), a fundamental metabolic pathway in cellular respiration that operates within the mitochondrial matrix. The content is appropriate for grade 12 or college-level biology students, as it requires detailed knowledge of biochemical intermediates, enzyme names, stoichiometry, and redox chemistry. Students must understand the sequential nature of the eight-step cycle, memorize specific enzymes like aconitase and malate dehydrogenase, identify the carbon number of various intermediates, and calculate the precise yield of electron carriers (NADH and FADH2) and energy molecules (GTP) produced. The questions demand both factual recall and quantitative reasoning skills, particularly when calculating products over multiple cycle turns and distinguishing between oxidized and reduced forms of electron carriers. Created by Jean Aplasca, a teacher in the Philippines who teaches grade 13. This quiz serves as an excellent tool for reinforcing the intricate details of cellular metabolism that students often find challenging to master. Teachers can deploy this assessment as a formative evaluation after completing instruction on cellular respiration, as targeted practice for students struggling with biochemical pathways, or as homework to reinforce classroom learning. The quiz works particularly well as a warm-up activity before discussing the electron transport chain, since students must solidify their understanding of NADH and FADH2 production before advancing to the next stage of cellular respiration. This assessment aligns with NGSS HS-LS1-7, which requires students to model metabolic processes that convert matter and energy, and supports AP Biology Learning Objectives related to cellular energetics and metabolic pathways.

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    Student View

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The "fuel" for the Kreb's cycle is

CO2

H2O

GTP

Acetyl-CoA

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many redox reactions does the cycle involves for a single turn?

1

2

3

4

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The enzyme needed to catalyze Citrate into Isocitrate

Citrate synthase

Aconitase

Isocitrate dehydrogenase

Isocitrate synthase

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

These are formed during the cycle which carries electrons and hydrogen ions to the Electron Transport Chain.

CO2 and H2O

NAD+ and FAD

NADH and FADH

GTP and CO2

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Succinyl CoA contains how many carbons?

2

6

5

4

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following intermediates is not a C4 species?

Fumarate

Citrate

Malate

Oxaloacetate

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many FADH2 are formed during two turn of the Krebs cycle?

2

4

6

0

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