MEDIUM
AS and A Level
IMPORTANT
Earn 100
Explain why
Insulin and glucagon have different second messengers.
Important Questions on Homeostasis
MEDIUM
AS and A Level
IMPORTANT
Explain why signal amplification in liver cells is necessary in the control of blood glucose.
MEDIUM
AS and A Level
IMPORTANT
Test strips can be used for testing biological samples other than urine for glucose. State the advantage of using test strips rather than Benedict's solution to test for glucose.
MEDIUM
AS and A Level
IMPORTANT
Suggest the advantages of using an electronic biosensor to measure blood glucose concentration, rather than using test strips to measure glucose in urine.
MEDIUM
AS and A Level
IMPORTANT
Make a labelled drawing of the pair of guard cells shown in the given figure. Show in your drawing the features of guard cells as described here.
HARD
AS and A Level
IMPORTANT
Show how the guard cells are adapted for opening and closing the stomata.
MEDIUM
AS and A Level
IMPORTANT
Draw a flow chart diagram to show the stages in opening and closing of a stomata.
MEDIUM
AS and A Level
IMPORTANT
Explain when it is an advantage for plants to close their stomata.
MEDIUM
AS and A Level
IMPORTANT
Outline how ABA functions to stimulate the closure of stomata.
