Pitt BIOSC 1850 - Final Exam Study Guide (24 pages)

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Final Exam Study Guide



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Final Exam Study Guide

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Pages:
24
Type:
Study Guide
School:
University of Pittsburgh
Course:
Biosc 1850 - Microbiology
Microbiology Documents

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BIOSC 1850 1ST Edition Final Exam Study Guide Class Average 47 5 Answers to Exam Questions 1 Genes code for proteins that change the polymerase In phage lambda the N protein accomplishes this In MS2 its genome is RNA The ribosomes have different access sites for different genes Unwinding the secondary structure opens it up for more genes 2 Viruses are classified by folds in capsid proteins alpha helices beta pleated sheets etc There are three groups of viruses a Icosohedral i Hepatitis HIV b Helical i Tobacco mosaic virus influenza c Complex i Phage lambda T4 Mu herpesvirus poliovirus 3 Pyocin small attacker functioning to poke holes in cell walls of bacteria It resembles a phage tail and is made by bacteria 4 T4 destroys host genome through the destruction of nucleotides upon initial infection allowing it to enter directly into the lytic cycle Phage lambda does not destroy the host genome instead it incorporated its genome into that of the host entering the lysogenic cycle Because destroying the host genome removes the option of the lysogenic cycle phage lambda does not destroy the host genome 5 Gene transfer agents package and injects chunks of DNA into other members of the same species 6 Circular permutation the DNA of host bacteria is circular Cutting the same DNA plasmid at different section results in a different linear form but with the same genes Based on the different cutting points of the plasmid there are different end points of the linear version of the DNA 7 Of all known sequences of ribosomal small subunit sequences chloroplasts and mitochondria come closest to those two bacterium This is evidence of the endosymbiotic theory 8 dsDNA lambda herpesvirus ssRNA ebolavirus influenzavirus dsRNA Phi6 9 This compound is a methylated nucleotide thymine This is important in the phage T4 life cycle because it prevents the viral DNA from being degraded by its host cell The methylation serves as protection 10 How mutations influence viral replication a Mutations in



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