a. Explain what is meant by a biosensor.

b. Copy and complete the following passage describing the action of a biosensor.

Many people with diabetes use a biosensor to measure the concentration of glucose in their blood. 

The biosensor uses the enzyme ............., which is ............. on a pad. This enzyme converts glucose into gluconolactone and .............. An electrode in the biosensor produces a tiny ............. current, the size of which is ............. to the concentration of glucose in the blood. The current is read by the meter, which produces a reading for blood glucose concentration. If the reading is too high, the person needs to take ............. to lower it.