9. (a) (i) Yeasts are eukaryotic organisms. What does this mean?
Yeasts being eukaryotic organisms means that they possess a defined nucleus and membrane-bound org... show full transcript
Worked Solution & Example Answer:9. (a) (i) Yeasts are eukaryotic organisms - Leaving Cert Biology - Question 9 - 2005
Step 1
Yeasts are eukaryotic organisms. What does this mean?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Yeasts being eukaryotic organisms means that they possess a defined nucleus and membrane-bound organelles within their cells. This distinguishes them from prokaryotic organisms, which lack these structures. Eukaryotic cells are generally more complex and capable of more specialized functions.
Step 2
To which kingdom do yeasts belong?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Yeasts belong to the kingdom Fungi.
Step 3
From which plant did you collect the leaf sample?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
I collected the leaf sample from a broadleaf plant, such as a bramble or a dandelion.
Step 4
Describe how you collected the leaf sample.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To collect the leaf sample, I carefully cut a healthy leaf from the plant using sterile scissors to avoid contamination. I made sure not to crush the leaf to preserve the yeast present on its surface.
Step 5
What did you do with the leaves when you returned to the laboratory?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Upon returning to the laboratory, I placed the leaves in a sterile Petri dish. I ensured that they were stored in a manner that prevented any contamination from the environment.
Step 6
Nutrient agar plates are used in this experiment. What are nutrient agar plates and what is their purpose?
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Nutrient agar plates are dishes containing agar prepared with nutrients that provide a suitable medium for the growth of microorganisms, including yeasts. They allow the yeast to grow and develop colonies that can be observed.
Step 7
What did you observe in the agar plates at the end of the experiment?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
At the end of the experiment, I observed pink colonies growing on the agar plates, indicating successful yeast growth from the collected leaf sample.
Step 8
Having finished the experiment, what did you do with the agar plates?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
After completing the experiment, I disposed of the agar plates safely by placing them in biohazard waste to prevent any environmental contamination.
Join the Leaving Cert students using SimpleStudy...
