Cambridge A Level Biology A2 Glucose Test Strips Biosensors Questions

[Maximum number: 4]

(a)

Type 1 diabetes in humans is a condition where the pancreas does not produce enough insulin to control blood glucose concentration.

Test strips are used to measure the concentration of glucose in a sample of urine. Two reactions take place on the test strip and a colour change occurs if glucose is present in the urine.

The equations for these reactions are:

\text { glucose }+ \text { oxygen } \xrightarrow{\text { glucose oxidase }} \mathbf{A} \quad+\text { hydrogen peroxide }

peroxidase
hydrogen peroxide $+\mathbf{B} \longrightarrow$ oxidised B+ water

[ 4 ]

(i)

Identify compound A and the type of substrate represented by B.

A
B

[ 2 ]

(ii)

Most people with diabetes mellitus use a biosensor to obtain their blood glucose concentration.

Suggest the advantages of using a biosensor rather than test strips.

[ 2 ]

CAIE A-Level Biology A2 14.1.11 Glucose Test Strips and Biosensors Questions

Exam points

CAIE A-Level Biology A2 14.1.11 Glucose Test Strips and Biosensors Questions question 1

Question (a)

Question (i)

Question (ii)