Microbiology Quiz 21 Quiz InstructionsThis quiz consists of 20 multiple-choice questions.You will be awarded 5 marks for each correct answer. Question 1: Heat labile solutions are usually sterilized byDry heatAutoclaveMembrane filtrationPasteurisation Question 2: All of the following are true about agar exceptLiquefies at 100°CA polysaccharide derived from a red alga.Metabolized by bacteriaFacilitate obtaining pure cultures Question 3: The 70S prokaryotic ribosome consist ofTwo 40S subunitsA 50S and a 30S subunitA 40S and a 30S subunitA 50S and a 20S subunit Question 4: What is the purpose of bacterial endospores?Allow the bacterium to make hundreds of "Seeds" to spread on the windHelp the bacterium to differentiate into faster growing stages of bacteriaAllow the bacterium to survive the absence of oxygenAllow the bacterium to survive extended periods of heat or dryness Question 5: ______ is the chemical constituents present in endospore which is largely responsible for its resistance natureMgCl2Dipicolinic acidCaCl2None of these Question 6: Th most common start codon for protein translation in bacteria is _______ which codes for formyl methionineAUGUAGUAAUGA Question 7: Bacterial enzymes that cuts DNA through sugar phosphate backbone at or near specific recognition nucleotide sequences are known asDNA ligasesAlkaline phosphatasesRestriction endonucleaseDNA polymerase Question 8: The toxicity of Gram negative Bacteria is often due toProtein secreted by the vegatative cellLipid a portion of lipopolysaccharide, also known as endotoxinEndosporeNone of the above Question 9: Peptidoglycan layer in bacterial cell wall is made ofCelluloseN Acetylmuramic acidN avetyglucodamine Both B an C Question 10: Which agar is commonly used for antibiotic sensitivity test?Nutrient agarMuller Hinton agsrBlood agarNone of the above Question 11: Multilayered capsid occurs inBlue tongue virusPox virusFMD VirusPoliovirus Question 12: The first virus known to mankind discovered by Ivanosky and BeijerinckTobacco mosaic virusFoot and mouth disease virusYellow fever virusPox virus Question 13: Reassortment is possible in ___ virusesdsRNAssRNAMultipartiteMonopartite Question 14: Largest known viruses arePox VirusPicornavirusPandora virusCircovirus Question 15: Electron microscope designed by Ernst Ruska that are used to see viruses has a magnification of1000 X10000X100000X7000X Question 16: Which of the following structures are not found in naked virions?@CapsomersPeplomersNucleocapsidProtomers Question 17: Th cancer producing retroviruses have an additional gene called agagpolv-oncenv Question 18: The genomic replication of most DNA viruses takes place in _____ of cellNucleusCytoplasmMitochondriaGolgi apparatus Question 19: A virus which is highly cytopathic in cell culture might be expected to induceVacuole formationSyncytial formationInclusion body formationAll Question 20: Which is not true about Baltimore classification of viruses?Based on the mechanism of mRNA productionViruses are classified into 7 groupsdsRNA viruses form group IIIUsed alone in morden virus classification
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