MadSci Network: Cell Biology |
You are correct water does destroy the sperm cell, most likely due to the differences in osmotic pressure. With regards to the DNA, water does not necessarily destroy the DNA. DNA molecules are quite stable in water or aqueous solutions. However, the molecules if left in water for extended periods of time can begin to degrade. To answer you question about what can destroy DNA, there are a number of things, from enzymes which cut and degrade the molecule to a variety of chemicals and radiation that can cause damage to and ultimately destroy the molecule. A more specific example of DNA destruction can be seen in the bacterial world. Many species of bacteria contain enzymes called endonucleases that they use to destroy foreign DNA that they encounter. These enzymes recognize specific DNA sequences called restriction sites. Once they recognize the site the enzyme cleaves the DNA at this site. Hope this helps. RMW
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