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CAIE A-Level Biology A2 14.1.9 Glucagon Cell Signalling Questions

Explain glucagon cell signalling using evidence from each question and mark scheme.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • Explain glucagon cell signalling.

CAIE A-Level Biology A2 14.1.9 Glucagon Cell Signalling Questions question 1

[Maximum number: 4]

Question (a)

(a)

Glucagon is released by the alpha ( α\alpha ) cells of the pancreas when the blood glucose concentration decreases below the set point.

Fig. 6.1 outlines the response of liver cells to glucagon.

Fig. 6.1

Fig. 6.1

[ 4 ]

Question (i)

(i)

With reference to Fig. 6.1, name enzyme A and second messenger B.

A

B

[ 2 ]

Question (ii)

(ii)

State the role of the enzyme cascade.

[ 1 ]

Question (iii)

(iii)

State the function of the final enzyme in the pathway, glycogen phosphorylase.

[ 1 ]
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