Lesson Worksheet: The Link Reaction and Krebs Cycle Biology

In this worksheet, we will practice describing the steps of the link reaction and the Krebs cycle and recalling the products of each.

Q1:

In the link reaction, what compound is removed from pyruvate to help form acetyl-CoA?

  • ANAD
  • BCarbon dioxide
  • COxygen
  • DATP

Q2:

In the link reaction, pyruvate is converted to acetyl-CoA. During this process, what happens to the coenzyme NAD?

  • AIt is hydrolyzed.
  • BIt is oxidized.
  • CIt is reduced.
  • DIt is phosphorylated.

Q3:

For each turn of the Krebs cycle, how many molecules of reduced NAD are produced?

Q4:

For each turn of the Krebs cycle, how many molecules of CO2 are released?

Q5:

For each turn of the Krebs cycle, how many molecules of reduced FAD are produced?

Q6:

For each molecule of glucose that enters glycolysis, how many turns of the Krebs cycle will there be?

Q7:

For each turn of the Krebs cycle, how many molecules of ATP are produced?

Q8:

The diagram provided shows a basic outline of the link reaction, with the names of two compounds removed.

What compound has been replaced by the letter Y?

  • ACoenzyme A
  • BTriose phosphate
  • CAcetyl-CoA
  • DATP

What compound has been replaced by the letter X?

  • ATriose phosphate
  • BAcetyl-CoA
  • CCoenzyme A
  • DATP

Q9:

In eukaryotes, what cellular organelle is the site of the link reaction and Krebs cycle?

  • ASmooth endoplasmic reticulum
  • BRibosome
  • CThe mitochondria
  • DNucleus
  • EGolgi apparatus

Q10:

The link reaction occurs in between glycolysis and the Krebs cycle. What is the primary reactant of the link reaction?

  • AGlucose
  • BCitric acid
  • CCarbon dioxide
  • DPyruvate
  • EAcetyl-CoA

This lesson includes 23 additional questions for subscribers.

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