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) From what plant did you obtain the yeast? (ii) Name the nutrient medium on which you grew the yeast. (iii) Outline the steps you followed to get the yeast cells onto the nutrient medium. (iv) How long did it take for the yeast to become visible on the nutrient medium? (v) How did you recognise the yeast? (vi) Describe one aseptic technique you carried out during this investigation.

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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

Draw a labelled diagram of a single, reproducing, yeast cell.

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Answer

To answer this part, the diagram should include the following labeled parts:

Nucleus
Bud
Cell wall
Cytoplasm

Make sure to use appropriate scientific conventions for your diagram.

Step 2

From what plant did you obtain the yeast?

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Answer

You could obtain the yeast from any valid plant such as Ash or Privet.

Step 3

Name the nutrient medium on which you grew the yeast.

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Answer

The nutrient medium used for growing the yeast is Agar.

Step 4

Outline the steps you followed to get the yeast cells onto the nutrient medium.

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Answer

Cut a leaf (or leaf section) from the plant.
Stick it to the lid of a Petri dish using tweezers.
Place the dish upside down, ensuring the agar is facing up.
Allow it to rest for approximately 24 hours.

Step 5

How long did it take for the yeast to become visible on the nutrient medium?

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Answer

It took 72 hours or approximately 3 days for the yeast to become visible.

Step 6

How did you recognise the yeast?

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Answer

The yeast was recognized by the formation of pink colonies or pink spots on the nutrient medium.

Step 7

Describe one aseptic technique you carried out during this investigation.

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Answer

One aseptic technique used was swabbing the bench with a disinfectant before starting the experiment to prevent contamination, as well as sterilizing instruments before usage.

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Draw a labelled diagram of a single, reproducing, yeast cell - Leaving Cert Biology - Question 7 - 2011

Worked Solution & Example Answer:Draw a labelled diagram of a single, reproducing, yeast cell - Leaving Cert Biology - Question 7 - 2011

Draw a labelled diagram of a single, reproducing, yeast cell.

From what plant did you obtain the yeast?

Name the nutrient medium on which you grew the yeast.

Outline the steps you followed to get the yeast cells onto the nutrient medium.

How long did it take for the yeast to become visible on the nutrient medium?

How did you recognise the yeast?

Describe one aseptic technique you carried out during this investigation.

Join the Leaving Cert students using SimpleStudy...

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