Paper 3 biology aqa paper 2023
Describe how pacing corpuscle produces generator potential
3 marks - correct answer-Stretch mediated sodium ion channels,
Sodium channels open,
Sodium ions diffuse in
All or nothing principle
2 marks - correct answer-Action potential only generated when threshold is reached ,
High pressure is above stimulus,
Time period between 0.6 and 4.0
1 mark - correct answer-Refractory period
Two variable to control in respiration yeast experiment
1 mark - correct answer-Mass of glucose,
Mass of yeast
Yeast rate of co2 production
2 marks - correct answer-2.5 x10-2
Why was yeast slower in maltose over glucose
2 marks - correct answer-Maltose is dissaccharide,
Hydrolysed into glucose
Method of respiration less accurate because? This could be improved by-
2 marks - correct answer-Less accurate - colour is subjective
Improved by - have a colour standard of the yellow as a reference for the end point
Link reaction , A B C D
2 marks - correct answer-A-Pyruvate
B-NADH
C-Coenzyme A
D-acetylcoenzyme A
Prokaryote tick box
1 mark - correct answer-Second Box
Mean no of bacteria in culture - correct answer-9.144x 10 to power of 8
Describe how pacing corpuscle produces generator potential
3 marks - correct answer-Stretch mediated sodium ion channels,
Sodium channels open,
Sodium ions diffuse in
All or nothing principle
2 marks - correct answer-Action potential only generated when threshold is reached ,
High pressure is above stimulus,
Time period between 0.6 and 4.0
1 mark - correct answer-Refractory period
Two variable to control in respiration yeast experiment
1 mark - correct answer-Mass of glucose,
Mass of yeast
Yeast rate of co2 production
2 marks - correct answer-2.5 x10-2
Why was yeast slower in maltose over glucose
2 marks - correct answer-Maltose is dissaccharide,
Hydrolysed into glucose
Method of respiration less accurate because? This could be improved by-
2 marks - correct answer-Less accurate - colour is subjective
Improved by - have a colour standard of the yellow as a reference for the end point
Link reaction , A B C D
2 marks - correct answer-A-Pyruvate
B-NADH
C-Coenzyme A
D-acetylcoenzyme A
Prokaryote tick box
1 mark - correct answer-Second Box
Mean no of bacteria in culture - correct answer-9.144x 10 to power of 8
