Gce Model Questions Vol1 2019 Biology Question 6
Practice objective / multiple choice question 6 from the 2019 Gce Model Questions Vol1 Biology examination.
In the regulation of blood glucose, pancreatic β‑cells secrete insulin at a rate \(R = a\,(G - G_{\text{thr}})\) when the blood glucose concentration \(G\) exceeds the threshold \(G_{\text{thr}} = 5\) mmol L⁻¹. Insulin increases glucose uptake by tissues at a rate \(U = b\,R\). At steady state the glucose production rate \(P\) equals the uptake \(U\). Given \(a = 1\) µU L⁻¹ min⁻¹ per mmol L⁻¹, \(b = 0.5\) mmol L⁻¹ per µU min⁻¹, \(P = 1\) mmol L⁻¹ min⁻¹ and the measured steady‑state glucose concentration is \(7\) mmol L⁻¹, a drug reduces the sensitivity \(a\) by 25 %. Assuming \(P\) remains unchanged, calculate the new steady‑state glucose concentration (to two decimal places).
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About This Question
This is Gce Model Questions Vol1 2019 Biology Question 6. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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