Cellular respiration

Question 1

Stages of cellular respiration

Answer 1

1. Glycolysis (-2 ATP + 4 ATP)
2. Kreb’s cycle (+2 ATP)
3. Electron Transport Chain (+34 ATP)

Question 2

Glycolysis

Answer 2

• in glycolysis the glucose molecule is split into two pyruvate molecules
• requires 2 ATPs & generates 4 ATPs
• can occur in the absence of oxygen (anaerobic process
• in addition to 4 ATPs, glycolysis results in 2 NADH molecules

Question 3

Where does glycolysis occur?

Answer 3

Anywhere in the cytosol

Question 4

Where does the Krebs/citric acid cycle take place?

Answer 4

• within the matrix (the inner compartment) of mitochondria

Question 5

Describe the preparatory step for the Krebs cycle

Answer 5

• pyruvate molecules are oxydized into Acetyl CoA, meanwhile reducing and NAD+ mol to NADH

Question 6

Describe the Krebs/citric acid cycle:

Answer 6

• the cycle is from citric acid to oxaloacetic acid and back, meanwhile producing CO2 , NADH, ATP, GTP & FADH2 molecules
• the resulting 10 NADHs, & FADH2s will be oxidized in the electron transport chain to produce ATPs

Question 7

What important processes take place within mitochondria?

Answer 7

• the citric acid cycle
• beta-Oxidation of fatty acids (degradation to acetyl-CoA)
• synthesis of amino acids
  At the inner mitochondrial membrane:
• electron transport chain (ATP synthesis by oxidation of NADH & FADH2)