In an experiment,glucose solution was heated then cooled before adding yeast solution.The gas produced was passed through a solution of lime water.

In an experiment,glucose solution was boiled and then allowed to cool before adding yeast suspension.A thin layer of oil was then added on top.The gas produced was then bubbled through a solution of lime water.
a)Explain why
i)Glucose was boiled
ii)Glucose solution was cooled
iii)A thin layer was added on top
b)State the expected results
c)Explain the result in (b) above.
d)Exolain how a control experiment can be set.

Answers

a)i)To remove dissolved oxygen
ii)To provide optimum temperature(To avoid denature of enzymes) for yeast suspension
iii) To prevent entry of atmospheric oxygen into the solution
b)Formation of a white precipitate on the lime water.
c)Yeast respires anaerobically (break down glucose in absence of oxygen)to produce carbon (IV) Oxide which turns lime water to white precipitate.

Biokenya answered the question on December 7, 2017 at 13:54

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In an experiment,glucose solution was heated then cooled before adding yeast solution.The gas produced was passed through a solution of lime water.

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