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Edexcel IAL Biology Unit 3 Corrections Qustions With Complete Solutions $15.49   Add to cart

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Edexcel IAL Biology Unit 3 Corrections Qustions With Complete Solutions

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  • Biology: Edexcel

Edexcel IAL Biology Unit 3 Corrections Qustions With Complete Solutions What do they mean by ' compare results with colour chart' - why is this done? that has been devised using a range of concentrations of reducing sugars / in which the colours correspond to a range of concentrations of redu...

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  • November 12, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Biology: Edexcel
  • Biology: Edexcel
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UpperClass
Edexcel IAL Biology Unit 3 Corrections
Qustions With Complete Solutions

What do they mean by ' compare results with colour chart' - why is this done? that has

been devised using a range of concentrations of reducing sugars / in which the colours

correspond to a range of concentrations of reducing sugars




An extract is tested for reducing sugars using Benedict's. It is assumed that the extract contained

all of the reducins sugars from the sample.


How can this assumption be tested? take the food residue (from the filter paper) (1)


and test it (for reducing sugars) with Benedict's (1)




Devise a procedure to determine the concentration of reducing sugars in a sweet potato. 5 marks

use {standard / known} {mass/volume} of sweet potato / use a standard volume of sweet

potato extract / volume of extraction liquid (1)

carry out reducing sugar test (1)

{filter the solution / remove precipitate} (after the test is carried out) (1)

{weigh the precipitate remaining in the filter paper / measure intensity of blue color in filtrate}

(1)

convert this {mass / intensity} to a concentration of reducing sugar / compare colour of tube

contents precipitate with a colour chart qualified (1)

, Edexcel IAL Biology Unit 3 Corrections
Qustions With Complete Solutions

How could you determine suitable concentrations of enzyme and substrate solutions to use in an

investigation to test the effect of pH on enzyme activity? run the experiment with a range

of different concentrations (1)

choose a combination in which the rate of change is not too {high / fast} / too {low / slow} /

time taken is not too {long / short} (1)




Name an inorganic ion needed for the synthesis of the following

Amino acids

Chlorophyll


Middle lamella Amino acids - sulphate, ammonium, nitrate


Chlorophyll - magnesium, nitrate

Middle lamella - calcium




Why are experiments repeated? Repeat experiment to measure variability/ find SD




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