For Qn 3, you need to read from the graph the max value as well as the resting value. The maximum level of blood sugar expressed as a multiple of the normal (resting) value is 138 (max value) / 92 (resting value) = 1.5
For question 4, Extra insulin will be released when glucose level increases above normal value (92 in this case), whereas glucagon level increases when glucose level decreases below 92. so C cannot be correct as at 1030 the curve is above 92, so it should be insulin not glucagon released. But at 1130, the curve is below 92, so glucagon is released.
For Question 12, For every gram of carbohydrates that is completely burnt, about 16kJ of energy is released. for protein and fats, it is 17kJ/g and 38kJ/g respectively. Carbohydrates is the easiest to metabolize as it is in the ready form for respiration. Between fats and proteins, they both have to be converted to glucose first but fats are used first as 1g of fat will yield 38kj instead of just 17kg with 1g of protein. Protein thus is the last choice in the human body.
Important Dates for O Level Science Biology: 22nd Oct: Paper 5 (practical)
(Please refer to admin breeze for Shift Number and Time to report to Student Centre)
6th Nov: Paper 4 (struct & essay)
11th Nov: Paper 1 (MCQ)
Please attempt all O level Papers from 1999-2008 as well as Prelim papers that have been given to you. Refer to MS to check your answers.
Practical Revision
Please refer to all the handouts given and food test guidelines (memorise the procedures).
You can use the comments sections in this blog to ask questions or direct your queries to Ms Menon at prameeta@hotmail.com /Mr Shen at magistershen@gmail.com.
1 comment:
For Qn 3,
you need to read from the graph the max value as well as the resting value.
The maximum level of blood sugar expressed as a multiple of the normal (resting) value is
138 (max value) / 92 (resting value) = 1.5
For question 4,
Extra insulin will be released when glucose level increases above normal value (92 in this case), whereas glucagon level increases when glucose level decreases below 92.
so C cannot be correct as at 1030 the curve is above 92, so it should be insulin not glucagon released. But at 1130, the curve is below 92, so glucagon is released.
For Question 12,
For every gram of carbohydrates that is completely burnt, about 16kJ of energy is released. for protein and fats, it is 17kJ/g and 38kJ/g respectively.
Carbohydrates is the easiest to metabolize as it is in the ready form for respiration.
Between fats and proteins, they both have to be converted to glucose first but fats are used first as 1g of fat will yield 38kj instead of just 17kg with 1g of protein.
Protein thus is the last choice in the human body.
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