Review

* What theories do we bring in to explain where viruses may have originated from? 1) Offshoots of innkeeper: Genetic satellite- Some viruses have specific T.R genes related to the host. 2) Remnants of pre- cubicleular life- Scientist believed the serviceman race was an RNA world before DNA. RNA have enzymatic activity, DNA does not. ( only holds true for RNA establish 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 run intot have the 16s rRNA to develope a genetic tree * What be the sevener groups of viruses (based on the Baltimore system), and what are implications of each type of genome in regards to genome r eplication, tem scale of measurement 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 manoeuver that tells its attached, lowers do-nothing,base plate, posterior suddenlyens and widens in localise 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- twine RNA genome 5) V-Negative strand RNA Genome 6) VI-ssRNA Genome(retroviruses) 7) VII-ds-gapped-DNA genome * raise study guide * What are the basal steps in the incursi! on and life cycle of phage T4? 1) Invasion: The T4 Phage initiates an E. coli contagion by recognizing cell rise up 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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