MEDIUM
AS and A Level
IMPORTANT
Earn 100

Explain the role of myelin in impulse transmission.

Important Questions on Control and Coordination

MEDIUM
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 15 - Control and Coordination>EXAM-STYLE QUESTIONS>Q 2

Outline the changes that occur at region A during the passage of an impulse in the direction shown by the arrow.

Question Image

HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 15 - Control and Coordination>EXAM-STYLE QUESTIONS>Q 4
Outline the events that occur when an impulse crosses a synapse between two neurones.
HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 15 - Control and Coordination>EXAM-STYLE QUESTIONS>Q 9
Barley grains are used to provide maltose in the making of beer. During the malting stage, gibberellin is often sprayed on the grains to increase the production of maltose. The natural concentration of gibberellin in barley grains is stated to be approximately 346× 10-6 g dm-3 which is equivalent to 1.0μmol dm-3. Outline a strategy that you could follow to investigate the effect of different concentrations of gibberellin on the activity of amylase in germinating barley grains.