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* What theories do we guard to explain where viruses may have originated from? 1) Offshoots of host: Genetic satellite- Some viruses have specific T.R genes related to the host. 2) Remnants of pre- cellphoneular life- Scientist believed the gentle race was an RNA world before DNA. RNA have enzymatic activity, DNA does not. ( only holds true for RNA ground viruses) 3) utmost(prenominal) Genome Regulation so a virus is dependent on the host, no genome left. * Why cant we determine the evolutionary relationship of viruses to other organisms (why cant we place on the tree of life?) 1) There is no sure answer. No idea where viruses fit into the tree of life due to no ribosome. There is no good relationship between virsus. 2) They hiret have the 16s rRNA to develope a genetic tree * What are the sevener groups of viruses (based on the Baltimore system), and what are implications of each type of genome in regards to genome replication, te m home office RNA synthesis, whether or not host cell enzymes may be used, etc? 1) I-dsDNA Genome-mRNA from DNA, used from host enzymes Steps;attachemnt to host, revieves a request that tells its attached, lowers do-nothing,base plate, posterior suddenlyens and widens insociety to unhorse material pass, base plate has lysoenzyme to degrade peptidoglycan; thence injection of DNA occurs.

2) II-ssDNA Genome 3) III-dsRNA Genome 4) IV-Plus- base RNA genome 5) V-Negative strand RNA Genome 6) VI-ssRNA Genome(retroviruses) 7) VII-ds-gapped-DNA genome * raise study guide * Wh at are the basic steps in the incursion an! d life cycle of phage T4? 1) Invasion: The T4 Phage initiates an E. coli contagion by recognizing cell rally receptors of the host with its long cross fibers (LTF). A recognition signal is sent through the LTFs to the baseplate. This unravels the short tail fibers (STF) that bind irreversibly to the E. coli cell surface. The baseplate changes conformation and the tail sheath contracts causing GP5 at the end of...If you want to get a full essay, order it on our website: BestEssayCheap.com

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