Respiration

Question 1

Importance of respiration

Answer 1

Produces ATP for AT and PS

Question 2

Glycolysis

Answer 2

In cytoplasm,
Glucose phosphorylated to glucose phosphate using inorganic phosphate from 2 ATP
Hydrolysed to 2 triosephosphate
Oxidised to pyruvate
2 NAD reduced
4 ATP regenerated

Question 3

What’s happens after glycolysis if anaerobic

Answer 3

Pyruvate converted to lactate or Ethanol
Oxidising reduced NAD SO NAD REGEN
so glycolysis can continue and continued atp production

Question 4

Link reaction

Answer 4

Pyruvate oxidised to acetate
Co2 produced
Reduced nad produced
Acetate combines with coenzyme a producing acetyl co enzyme a
Happens in mitochrondrial matrix

Question 5

Describe the Krebs cycle

Answer 5

Acetyl coenzyme A reacts with a
4C molecule
Releasing coenzyme A Producing a 6C molecule that enters the Krebs cycle
In a series of oxidation-reduction
reactions, the 4C molecule is
regenerated and:
2 x CO2 lost
Coenzymes NAD & FAD reduced
○ Substrate level phosphorylation
→ ATP produced

Question 6

oxidative phosphorylation

Answer 6

Reduced NAD/FAD oxidised to release H atoms
2. Electrons transferred down electron transfer chain
○ By redox reactions
3. Energy released by electrons used in the production of ATP from ADP +
○ Energy used by electron carriers to actively pump protons from matrix → intermembrane space
○ Protons diffuse into matrix down an electrochemical gradient, via ATP synthase
○ Releasing energy to synthesise ATP from ADP + Pi
4. In matrix at end of ETC, oxygen is final electron acceptor
○ So protons, electrons and oxygen combine to form water