Answer the questions below in relation to the growth of leaf yeast in the laboratory - Leaving Cert Biology - Question 8(b) - 2015
Question 8(b)
Answer the questions below in relation to the growth of leaf yeast in the laboratory.
(i) What principal nutrient was added to the agar for the yeast?
(ii) How did... show full transcript
Worked Solution & Example Answer:Answer the questions below in relation to the growth of leaf yeast in the laboratory - Leaving Cert Biology - Question 8(b) - 2015
Step 1
What principal nutrient was added to the agar for the yeast?
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Answer
The principal nutrient added to the agar for the yeast was malt extract. This provides essential sugars that yeast can metabolize for growth.
Step 2
How did you introduce the yeast into the Petri dishes?
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The yeast was introduced into the Petri dishes by attaching leaves or leaf pieces to the inside of the lid. After securing the leaves, the lid was replaced on the dish, which was kept upright for 24 hours to allow for yeast transfer.
Step 3
What did the yeast look like when it had grown on the agar?
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When the yeast had grown on the agar, it appeared as pink colonies, often described simply as pink or with 'colonies' formation.
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