Micriobiology Essay Example | Topics and Well Written Essays - 500 words

Micriobiology - Essay Example (1). Though bacteroides and escherichia are gram-negative bacteria with similar rod like shape, they are in different sections of the Bergey’s Manual, because they belong to different species. Escherichia belongs to the facultative species, while bacteroides belong to the anaerobic species. (2). DNA cloning is the process used for this genetic recombination. This process involves the isolating the DNA from the bacteriophages, and then using restriction enzymes to cut the DNA into fragments called restriction fragments. The restriction fragments are then introduced into the bacteria. (1). A DNA virus on penetrating a host cell releases the viral genome from the capsid and using the host cell polymerases begins transcribing viral mRNA. New virions are then assembled and released through cell lysis or by budding off the cell membrane. Whereas the lytic cycle of an RNA virus is dependent on the polarity of the RNA and whether the genetic material is single stranded or double stranded. In the creation of their genomes RNA viruses are very dependent on virally encoded RNA replicase (1). Viruses cause tumor by changing cells through the integration of their genetic material with DNA of the host cell. It was believed that only DNA viruses could cause cancer, as DNA viruses can directly insert their genetic material into the host cell DNA. RNA viruses can also cause cancer by first transcribing their RNA to DNA and then inserting the genetic material into the host cell DNA. (1). 4. You are growing Bacillus subtilis in nine 16,000-liter fermenters to produce enzymes for industrial use. The Bacillus cultures had been growing for two days when the cells in one of the fermenters lysed. Explain what happened in this fermenter. The phospholipid bilayer is important to living cells as it enables cell coagulation and provides living cells with the ability to sense and react to the