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An investigation of the lethal DNA effects of sunlight on UV-sensitive yeast

Chelsea Seah (01), Ee Xueqin (02), Myat Noe Pwint (05), Nehal Janakraj (06)

School of Science and Technology, Singapore


Abstract

Sunlight is known to have both positive and negative effects on the skin cells of humans. Through various researches that have been conducted by professionals all over the world, it is discovered that sunlight is able to alter the deoxyribonucleic acid (DNA) in an organism if it has been exposed to sunlight for long periods of time, causing harmful effects to the cell. The aim of our experiment was to find out what negative DNA effects ultraviolet (UV) rays have on yeast. Two sets of agar plates with UV-sensitive yeast were tested, in which one set was exposed directly to the sun for 2 to 4 minutes, depending on the intensity of the sun, and the other set was incubated in the dark at room temperature. Results indicated that a higher percentage of yeast exposed to the sunlight were killed than the ones which were kept in the dark at room temperature. With these results, we would like to share with others the effect UV rays have on yeast cells. Our experiment shows how deadly UV rays can be on UV-sensitive yeast cells or any other cells that are sensitive to UV rays.

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