Anaerobic Fermentation

Anaerobic & Aerobic Respiration

By R. Marsh Ph.D.

Complete the graphic.

Use this image to answer the fallowing questions.​

Multiple Choice

For Glycolysis what molecule do you start with?

• Ethanol

• Lactate

• Glucose

• Pyruvate

Multiple Choice

Where does Glycolysis take place?

• Cytosol

• Mitocondria

• Chloroplast

• Pyruvate

Multiple Choice

Anaerobic glycolysis yields a net gain of _______ ATP.

• 4

• 3

• 2

• 1

Multiple Choice

To start Glycolysis how much energy is needed?

• 2 ATP

• 4 ATP

• 1 ATP

• 0 ATP

Multiple Choice

If NO oxygen was present, could a yeast cell make ATP by metabolizing glucose?

• Yes

• No

Multiple Choice

Yeast makes ATP by what process?

• Fermentation resulting in Glucose

• Fermentation resulting in Lactate

• Fermentation resulting in Ethanol and CO₂

• Fermentation resulting in Pyruvate

Multiple Choice

What happens during anaerobic cellular respiration?

• Glucose is broken down to pyruvate then to Lactate or Ethanol

• Glucose is broken down to Lactate or Ethanol

• Glucose is broken down to pyruvate

• Glucose is broken down to pyruvate and enters the mitochondria

Open Ended

If a cell had to do without oxygen-say because your muscles are exerting and consuming ATP at such a high rate that your heart and lungs can't keep up with their demand for oxygen-which of the following would occur? (look at the image)

Open Ended

Do anaerobic organisms need less energy, as the amount of energy gained from glucose by glycolysis and fermentation process is less?

Aerobic Respiration

​•  In the Krebs cycle, the oxidation of acetyl groups is coupled to the reduction of hydrogen carriers, liberating carbon dioxide

​______

The second stage of aerobic respiration is the Krebs cycle, which occurs within the matrix of the mitochondria​

Krebs Cycle

​The Krebs cycle is also commonly referred to as the citric acid cycle.​

​In the presence of oxygen, 3C

Pyruvate is converted (OXIDIZED) into Acetyl CoA in an intermediate process just before the Citric Acid Cycle.

Next acetyl CoA 2C acetyl group joins the 4C four-carbon molecule to form (citrate), a 6C six-carbon molecule,)

Krebs Cycle

​Over a series of reactions, the 6C compound is broken down to reform the original 4C compound (hence, a cycle)

• Two carbon atoms are released via decarboxylation to form two molecules of carbon dioxide (CO2)

• Multiple oxidation reactions result in the reduction of hydrogen carriers

• (3 × NADH + H+ ; 1 × FADH2)

• One molecule of ATP is produced 

Krebs Cycle

As the link reaction produces two molecules of acetyl CoA (one per each pyruvate), the Krebs cycle occurs twice

• Per glucose molecule, the Krebs cycle produces: 

  •  4 × CO2  ;  2 × ATP  ;  6 × NADH + H+  ;  2 × FADH2

Krebs Cycle

Multiple Choice

Before entering Krebs Cycle, pyruvate is:

• Oxidized
• Reduced
• Isomerized to Acetyl-CoA
• Phosphorylated

Multiple Choice

The number of ATP molecules produced out of Krebs Cycle is:

• 2
• 3
• 4
• 0

Multiple Choice

How many NADH molecules are produced by a molecule of glucose through the Krebs' Cycle?

• 2
• 3
• 4
• 6

Multiple Choice

How many CO₂ molecules are produced by the Krebs Cycle for a molecule of glucose?

• 2
• 4
• 6
• 3

Multiple Choice

After Krebs Cycle, how many Carbon atoms from the original glucose molecule remain?

• 0
• 1
• 3
• 2