Yeast Cells and Simularities to Human Cells Yeast cells are microorganisms. In this website we will tell you how yeast are more simular to human cells than bacteria. Baker’s yeast cells (Saccharomyces cerevisiae) are good to use in this experiment for several reasons. These yeast cells which survive UV radiation form obvious colonies that are easy to count by eye. Another good reason is because they are not pathogenic certain DNA breaks or changes. One of the main repair enzymes when it comes to UV radiation repair is (disease causing) like some microbes. Finally, they are more like human cells than many other microbes. Yeast cells unlike bacterial cells have organelles like human cells. Organelles are structures in the cell(s) usually surrounded by a membrane that performs a specialized task. Deadly UV Light This is all about UV light specificly and how it effects life.UV light is the most damaging light to living organisms. There are three different categories of UV light. These three categories are UV-A, UV-B, and UV-C. UV-A has a wavelength range of 400 to 320 nm on the electromagnetic spectrum, UV-B has a range of 320 to 290 nm on the spectrum, and UV-C has a range of 290 to 180 nm on the spectrum. UV-C is completely absorbed by the ozone layer and, therefore, does not reach the earth. Some of the UV-B goes through the ozone layer and reaches the surface of the earth. UV-A is absorbed very little by the ozone layer. Although much more UV-A reaches the earth than UV-B, UV-B has more energy associated with its wavelengths. This means that UV-B has the potential to do more or as much damage even though less hits the earth compared to UV-A. One short-lived harmful effect of UV light on skin is sunburn. UV-B radiation contributes much more to sunburn than does UV-A. Sunburn is an inflammatory response to skin damage caused by UV radiation. The reason why the skin turns red is at least in part because the blood vessels become dilated and get closer to the surface of the skin where their red color is more easily seen. Two more serious problems caused by UV light are premature skin aging and skin cancer. UV-A is probably the main contributor to premature aging of the skin although UV-B a significant contribution. Both UV-B and UV-A are believed to be causes of skin cancer.

About the Spectrum This is the light spectrum and all about how UV-B radiation effects yeast and other organisms. Baker’s yeast cells (Saccharomyces cerevisiae) are good to use in this experiment for several reasons. These yeast cells which survive UV radiation form obvious colonies that are easy to count by eye. Another good reason is because they are not pathogenic certain DNA breaks or changes. One of the main repair enzymes when it comes to UV radiation repair is (disease causing) like some microbes. Finally, they are more like human cells than many other microbes. Yeast cells unlike bacterial cells have organelles like human cells. Organelles are structures in the cell(s) usually surrounded by a membrane that performs a specialized task. Life is affected by light in many ways. Light allows photosynthesis (which is probably the most important process in life) which provides plants with energy. Plants are at the bottom of the food chain and therefore all other animals rely on them for food and life. Light also enables many animals to see. Surgeons can use lasers to cut tissue and improve vision. Yet light can also be harmful to living organisms. Too much light may cause skin cancer, premature skin aging, suppression of the immune system, cataracts and other types of eye damage, and even cell death. What Makes UV so Dangerous This is where you can learn about the dirrect and inderect damage of UV light. UV light is the most damaging light to living organisms. There are three different categories of UV light. These three categories are UV-A, UV-B, and UV-C. UV-A has a wavelength range of 400 to 320 nm on the electromagnetic spectrum, UV-B has a range of 320 to 290 nm on the spectrum, and UV-C has a range of 290 to 180 nm on the spectrum. UV-C is completely absorbed by the ozone layer and, therefore, does not reach the earth. Some of the UV-B goes through the ozone layer and reaches the surface of the earth. UV-A is absorbed very little by the ozone layer. Although much more UV-A reaches the earth than UV-B, UV-B has more energy associated with its wavelengths. This means that UV-B has the potential to do more or as much damage even though less hits the earth compared to UV-A. One short-lived harmful effect of UV light on skin is sunburn. UV-B radiation contributes much more to sunburn than does UV-A. Sunburn is an inflammatory response to skin damage caused by UV radiation. The reason why the skin turns red is at least in part because the blood vessels become dilated and get closer to the surface of the skin where their red color is more easily seen. Two more serious problems caused by UV light are premature skin aging and skin cancer. UV-A is probably the main contributor to premature aging of the skin although UV-B a significant contribution. Both UV-B and UV-A are believed to be causes of skin cancer. This is part of an experiment. So that is why there may be something like we will be irradiating yeast cells for such and such time.