4. Discussion

4.1 Key findings

It is found out that UV rays do harm UV-sensitive cells such as UV sensitive yeast cells. This is shown from the results when the sets which are exposed had lesser colonies of yeast which grew when compared to the sets which were the control (not exposed).

4.2 Explanation of key findings  

When the exposed yeast cells receives the UV rays, they would be harmed since they are sensitive to UV rays. However, the yeast cells which were not exposed to UV rays at all could experience a healthier growth since none of the yeast cells were affected. As a result of this, more colonies of yeast grew on the control sets when compared to the sets which were exposed. This is so because UV rays does slowly penetrate and destroy the cell membranes of yeast. UV radiation does not kill yeast cells straightaway, but damages their DNA. When the order in DNA is altered, this causes its characteristics to change too. When yeast cells are exposed to higher UV radiation, their DNA becomes irreparably damaged by the UV radiation. (The Effects of Ultraviolet Radiation on Yeast, 2010)

4.3 Evaluation of hypothesis

Since UV rays have negative effects on living cells, if the UV-sensitive yeast is exposed to UV rays, there would be lethal DNA effects on the yeast, causing the yeast to be unable to function properly.
The hypothesis was proven to be correct. This is clearly shown from the results obtained when lesser colonies grew on the sets which were exposed to the UV rays. The yeast could not function properly, thus affecting its growth. 

4.4 Areas for improvement

Instead of just two agar plates per set, more agar plates could have been prepared, for example four agar plates per set. This will help in the accuracy and reliability of our experiment results.

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