Unit 5 Respiration

Question 1

What are the 4 stages of respiration

Answer 1

• Glycolysis
• Anaerobic respiration
• Aerobic respiration
• Electron transfer chain

Question 2

Describe where and what happens in Glycolysis

Answer 2

•Glycolysis is the 1st stage in both aerobic and anaerobic respiration and it occurs in the cytoplasm
First glucose is broken down into two molecules of pyruvate

• phosphorylation of glucose to glucose phosphate using ATP
• Glucose phosphate is then split into triose phosphate
• Triose phosphate then oxidised to 2 molecules of pyruvate

Question 3

What are the products of glycolysis

Answer 3

ATP
NADH
Pyruvate

Question 4

Describe where and what happens in the link reaction

Answer 4

Occurs in the mitochondrial matrix and it forms acetylene coenzyme A (CoA) from pyruvate

• pyruvate is oxidised to acetate releasing carbon dioxide (NAD oxidised to NADH
• acetate combines with coenzyme A
• producing Acetyl CoA

Question 5

Where are the product of the link reaction

Answer 5

Acetyl CoA

NADH

Question 6

Describe where and what happens in the Krebs cycle

Answer 6

Occurs in the matrix and forms a 6 carbon by combining Acetyl and 4 carbons

Question 7

What’s are the products of Krebs cycle

Answer 7

4 carbon dioxide
2 ATP
6 NADH
6 FADH

Question 8

What’s the electron transfer chain

Answer 8

Electron transfer chain occurs in the Cristae and it involves ATP regeneration and oxygen

Question 9

Describe the process of the electron transfer chain

Answer 9

• NADH to NAD & FADH to FAD } oxidised this produces protons and electrons
• Electrons are passed down the electron transfer chain losing energy
• this energy is used pump protons across the intermolecular membrane
• Protons are then passed down ATP synthase(Chemiosmosis) and with the beefy released from H+ ATP is produced
• once electrons are passed down the ETC they combine with oxygen ( FINAL ELECTRON ACCEPTOR)

Question 10

What is the anaerobic respiration

Answer 10

Without oxygen and starts with glycolysis