Unit 5B: Respiration

Question 1

Structure of ATP

Answer 1

Adenine, ribose, 3 phosphates

Question 2

Features of ATP

Answer 2

• immediate energy source
• cannot be stored so constantly produced

Question 3

Equation of aerobic respiration

Answer 3

C6H12O6 + 6O2&raquo_space;> 6CO2 + 6H2O

Question 4

Use of aerobic respiration

Answer 4

• transporting substances across membranes
• anabolic reactions
• movement
• maintaining body temperature

Question 5

Examples of use of aerobic respiration

Answer 5

• sodium potassium pump
• expcytosis
• synthesis of DNA
• synthesis of proteins
• cellular movement of chromosomes
• mechanical contraction

Question 6

Four stages of aerobic respiration

Answer 6

1) glycolysis
2) link reaction
3) krebs cycle
4) oxidative phosphorylation

Question 7

What are coenzymes

Answer 7

• molecules that aid enzymes by transferring a chemical group between molecules

Question 8

Process of glycolysis

Answer 8

1) phosphorylation - 2 phosphate molecules are added to glucose to make it more reactive
2) splitting of glucose - for each triose phosphate, NAD is reduced, 4 ATP is produced, 2 pyruvate produced
3) production of ATP - 4Pi + 4ADP&raquo_space;> 4ATP

Question 9

Products of glycolysis

Answer 9

• 2 NADH is used for oxidative phase
• 2 pyruvate is used for link reaction
• 2 ATP is used for energy

Question 10

Process of link reaction

Answer 10

• pyruvate loses an electron forming CO2
• 2C complund then forms acetyl group where it loses H+ atoms, NAD is reduced
• acetyl compound transferred to coenzyme A to form acetyl CoA
• glycolysis splits glucose into 2 pyruvate molecules, link reaction occurs twice per glucose

Question 11

Products of link reaction

Answer 11

2 acetyl CoA - krebs cycle
2 CO2 - waste product
2 NADH - oxidative phosphorylation