Question 4(b)
Nov 2007
(b) The enzyme glucose oxidase catalyses the conversion of glucose to gluconic acid.
glucose + O2 + H2O
gluconic acid + H2O2
Describe how glucose oxidase in a biosensor can give warning of low blood glucose
concentration (hypoglycaemia).
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_qp_4.pdf
Markscheme says
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_ms_4.pdf
enzyme immobilised (in biosensor) ;
H+ ions released (from gluconic acid) ;
give positive charge ;
current flows ;
size of current proportional to concentration of, H+ / glucose ;
low reading (when blood tested) indicates, hypoglycaemia / low blood glucose
concentration ;
A ora
alternative points
platinum electrodes ;
detects oxygen concentration ;
can someone please write the answer exactly that i should write ?
thank you
Nov 2007
(b) The enzyme glucose oxidase catalyses the conversion of glucose to gluconic acid.
glucose + O2 + H2O
gluconic acid + H2O2
Describe how glucose oxidase in a biosensor can give warning of low blood glucose
concentration (hypoglycaemia).
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_qp_4.pdf
Markscheme says
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_ms_4.pdf
enzyme immobilised (in biosensor) ;
H+ ions released (from gluconic acid) ;
give positive charge ;
current flows ;
size of current proportional to concentration of, H+ / glucose ;
low reading (when blood tested) indicates, hypoglycaemia / low blood glucose
concentration ;
A ora
alternative points
platinum electrodes ;
detects oxygen concentration ;
can someone please write the answer exactly that i should write ?
thank you