The Link Reaction

What is the link reaction?

• The link reaction connects glycolysis, where glucose is broken down into pyruvate, to the Krebs cycle by converting pyruvate into acetyl-CoA

• 1. The link reaction is a process that only occurs in plants and not in animals.

• 1. The link reaction is a process that occurs outside of the mitochondria.

• All of the above

Where does the link reaction occur

• 1. The link reaction occurs in the endoplasmic reticulum, which is responsible for the synthesis of proteins and lipids.

  
  

• It takes place in the mitochondrial matrix.

• 1. The link reaction occurs in the nucleus of the cell, where DNA is stored.

• All of the above

What is the main enzyme involved in the link reaction?

• The main enzyme involved in the link reaction is ATP synthase

• 1. 
     The main enzyme involved in the link reaction is creatine kinase.

  
  

• The enzyme complex called pyruvate dehydrogenase is responsible for catalyzing the reaction

• The main enzyme involved in the link reaction is glucose 6-phosphate dehydrogenase

What are the reactants of the link reaction?

• The reactants of the link reaction are pyruvate and citrate.

• The primary reactants are pyruvate (produced from glycolysis), NAD, and coenzyme A (CoA).

• 1. The reactants of the link reaction are ATP and NADH.

• 1. The reactants of the link reaction are glucose and oxygen.

What are the products of the link reaction

• The products are acetlyl- CoA, NADH, and carbon dioxide (CO2)

• 1. The products of the link reaction are lactic acid and ATP.

• The products of the link reaction are glucose and ADP

• The products of the link reaction are ATP (adenosine triphosphate) and NADH

Is the link reaction aerobic or anaerobic?

• Aerobic

• Anaerobic

Why is the link reaction important?

• 1. The link reaction is important because it helps to store glucose in the cell.

• 1. The link reaction is important because it helps to recycle CO2 into glucose.

• 1. The link reaction is important because it provides a source of energy for anaerobic respiration.

• It is crucial because it provides acetyl-CoA, which is needed to enter the krebs cycle, and it also generates NADH, which plays a role in the electron transport chain.

How many molecules of acetyl-CoA are produced per glycose molecules during the link reaction?

• 1

• 2

• 3

• 4

Does the link reaction directly generate ATP?

• yes

• no

What happens if oxygen is not present for the link reaction?

• 1. The link reaction will occur but will generate lactic acid instead of ATP.

• 1. The link reaction will occur as normal and the cell will still produce ATP.

• 1. The link reaction will still occur but with a reduced efficiency.

• If oxygen is not available, pyruvate is converted into lactate or ethanol through fermentation, rather than entering the link reaction to form acetyl-CoA.