Prepare and show the production of alcohol by yeast
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What substrate is used in the production of yeast? | Glucose
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| The Glucose is broken down into alcohol using.... | yeast
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| This type of respiration is called... | Anaerobic
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| The control in this investigation is a ... | flask with glucose solution only
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| The purpose of the fermentation lock is... | to ensure anaerobic conditions develop within the flask
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| Name the liquid placed in the fermentation lock | water or limewater
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| At which temperature does the reaction take place? | 30 degrees celsius
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| Which gas is produced as the investigation proceeds? | Carbon Dioxide
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| What effect does the gas produced have on limewater? | It changes from clear to milky white
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| Why is the product filtered? | To remove the yeast
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| Name the two chemicals used to test for alcohol. | Potassium iodide and sodium hypochlorite
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| what colour is produced when the test chemicals are mixed? | Brown
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| what temperature is needed to get a positive result? | 60 degrees celsius
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| a positive test for alcohol is indicated by the formation of | a yellow precipitate
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| Yeast belongs to which kingdom | Fungi
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| Fermentation stops when | The alcohol concentration rises and poisons the yeast
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| Other than free yeast what other type of yeast can be used in this investigation? | Immobilised yeast
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| Alcohol which comes in contact with bacteria in the air is broken down into... | vinegar
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PDST Biology
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