Review

* What theories do we halt 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- cellphoneular life- Scientist believed the humane 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 containt have the 16s rRNA to develope a genetic tree * What atomic number 18 the sevener groups of viruses (based on the Baltimore system), and what are implications of each type of genome in regards to gen ome replication, tem eggshell 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 signalise that tells its attached, lowers do-nothing,base plate, posterior suddenlyens and widens in night club 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- beach 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 staple steps in the incursion an! d life cycle of bacteriophage T4? 1) Invasion: The T4 Phage initiates an E. coli contagion by recognizing cell get along 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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