Pech's Blog entry #13

This week, we've discussed the topic of viruses. Many have debated whether or not viruses are alive, but I think that viruses are alive because viruses are consider prokaryotic cell and they are constantly growing and dividing themselves very quick. They also adapt to the surrouding environment around them (inside our body) very quickly. There are four types of virus cycles, and they are lytic cycle, lysogenic cycle, retrovirus and envelop virus. In lytic cycle is the process that the virus move around and find the bacteria that are beneficial to our body and it injects its DNA into the the host. The DNA inside the host began to break down and eventually break into viruses, after it becomes too much for the cell to store, the cell eventually burst and release the viruses. Examples of lytic cycle is E-Coli. During the lysogenic cycle, the virus DNA become part of the bacteria DNA and it becomes a pro-virus and is inactive for period of times. The cell eventually divide into daugther cells, and the virus become the lytic cycle. Example of lysogenic cycle is Herpes. Retrovirus is a type of virus that is constantly changing, and it usually makes random mistakes. It enters the nucleus and become part of the DNA and through DNA replication, the virus cell become RNA and enter the ribosome and create the harmful protein and the virus spread and divide exponentially. Example of retrovirus is the HIV virus that cause the deadly disease, AID. During the envelop virus, instead of entering the nucleus and become part of the DNA, it went through the ribosome, and example of that is Hepatitis C.