Draw a labelled diagram of a single, reproducing, yeast cell - Leaving Cert Biology - Question 7 - 2011
Question 7
Draw a labelled diagram of a single, reproducing, yeast cell.
Answer the following questions in relation to your investigation into the growth of leaf yeast.
(i) F... show full transcript
Worked Solution & Example Answer:Draw a labelled diagram of a single, reproducing, yeast cell - Leaving Cert Biology - Question 7 - 2011
Step 1
(a) Draw a labelled diagram of a single, reproducing, yeast cell.
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Answer
To draw a labelled diagram of a single yeast cell, first represent the cell shape which is typically oval or round. Inside the cell, illustrate the nucleus, which is usually round and located centrally. Add the cell wall that encases the cell, and illustrate a bud on one side, which indicates reproduction. Label each part clearly as 'Cell Wall', 'Nucleus', and 'Bud'.
Step 2
(i) From what plant did you obtain the yeast?
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Yeast can be obtained from any valid plant such as Ash or Privet.
Step 3
(ii) Name the nutrient medium on which you grew the yeast.
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The nutrient medium used for growing the yeast is typically Agar.
Step 4
(iii) Outline the steps you followed to get the yeast cells onto the nutrient medium.
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Obtain a leaf or a leaf section from the yeast source plant.
Use tweezers to gently place the leaf section onto the lid of a Petri dish.
Position the Petri dish upside down, ensuring the yeast side is facing down.
Leave the dish undisturbed for approximately 24 hours.
Step 5
(iv) How long did it take for the yeast to become visible on the nutrient medium?
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It took approximately 72 hours or 3 days for the yeast to become visible on the nutrient medium.
Step 6
(v) How did you recognise the yeast?
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The yeast can be recognised by observing pink colonies or pink spots on the nutrient medium.
Step 7
(vi) Describe one aseptic technique you carried out during this investigation.
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One aseptic technique used was to swab the bench with a disinfectant to sterilise the surface before starting the experiment. Additionally, all instruments were sterilized, and the Petri dish was kept face downwards on the bench to prevent contamination.
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