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MMI Module Exam Unit 3 and 4
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Questions in this quiz (29)
1Which ones are DNA- Containing Viruses?
- AHerpes simplex
- BSmallpox
- CAdenoviridae
- DHPV
- EParvoviridae (B-19)
- FHepatitis B virus
- GHepatitis A virus
- HRubella
- IEbola Virus
- JHIV
2Viruses are living cells
- ATrue
- BFalse
3Which of the following statements are correct?
- AViruses can be transferred by mucosal droplets, water, bugs and through the air.
- BThey are living cells
- CViruses are bigger than bacteria
- DThey contain special organelles that allow them to self replicate with little to no energy source
4Which attributes do viruses have?
- ASmaller than bacteria
- BLarger than bacteria
- CContains DNA or RNA, never both
- DContains DNA and RNA
- EFew enzymes
- FContains many ribosomes
- GNo ribosomes or enzymes for metabolizing nutrients
- HContains ribosomes or enzymes for metabolizing nutrients
5A virus floats until it finds a suitable host cell. When it does, it unloads "cargo", machinery that allows the virus to take over the host cell 's resources. The virus then uses the resources to produce identical copies of itself. The clones then leave and look for another host cell.
- ATrue
- BFalse
6What is a virion?
- AAn infectious viral particle with nucleic acid surrounded by a protein coat
- BA protein that is essential for the virus to replicate itself.
- CAnother term for a virus
- DA virus prion
7Capsids are _____ that are made of _____ also known as _____
- AProtein coats; capsomeres; protein molecule
- BProtein coats; virions; protein molecules
- CProtein coats; capsomeres; protein chains
- DOuter coat; capsomeres; virions
8What are inserted in envelopes or capsids?
- AGlycoproteins or spikes
- BGlyoproteins or glycolipids
- CVirions or spikes
- DVirions or glycoproteins
9What is a Nucleocapsid?
- AThe complete capsid of a virus.
- BA capsid that is a part of the nucleus
- CAn incomplete capsid membrane that surrounds the Nucleic acid
- DThey are the complete capsid of a virus made out of nucleic acids
10A bacteriophage is a bacterial macrophage, so it eats good cells and digests its nutrients.
- ATrue
- BFalse
11HIV is single stranded
- ATrue
- BFalse
12If the virus did not take a piece of the original host phospholipid membrane and use that as the membrane, it may form a lipid envelope from the host cells of other cells it has infected
- ATrue
- BFalse
13Which of the following statements are not true about bacteriophages?
- AThey are viruses that infect bacterial cells and can transfer new genes from one bacteria to another
- BThey can be used as a tool for genetic engineering
- CThey can transfer genes for the production of a toxin
- DThey have a host range of animal bacteria.
14What are the events that occur in viral infections?
- A1) The viral particles' membrane either fuses with the membrane, leaving the capsid to carry the virus into the cytoplasm of the host cell or the viral particle can cross the host cell membrane by pinocytosis
- B1) The viral particles' membrane can fuse with the membrane due to its affinity for the viral particles receptors, or it can cross it by binding to the sites due to the tropism (cells affinity) for the viral receptors and then being pinocytosed by the host cell
- C2) DNA Virus: The virus DNA uses the host cells DNA polymerase to replicate itself in the host cell nucleus. Then is uses DNA-dependent DNA polymerase to replicate its genome DNA->DNA then uses reverse transcriptase DNA->RNA->DNA
RNA Virus: Uses its own RNA polymerase and reverse transcriptase. So it uses RNA-dependent RNA polymerase for replication RNA->RNA and then uses reverse transcriptase RNA->DNA - D2) DNA Virus: The virus DNA uses the host cells DNA polymerase to replicate itself in the host cell nucleus. Then is uses DNA-dependent DNA polymerase to replicate its genome DNA->DNA then uses reverse transcriptase DNA->RNA->DNA
RNA Virus: Uses its own RNA polymerase and uses RNA-dependent RNA polymerase for replication RNA->RNA and then uses reverse transcriptase RNA->DNA->RNA - E3) Association of newly replicated RNA or DNA with newly made viral proteins results in new nucleocapsids. If envelope components are produced and inserted into the host cell plasa membrane, the viral particle then attaches to the plasma membrane and buds through, thus forming an enveloped virus.
- F3) Newly made viral proteins and newly replicated DNA or RNA nucleic acid form new capsids. An enveloped virus can form if a virus forms all of its viral components, then detaches itself from the host cell and looks for a new host cell to infect. When it successfully finds and infects a new host cell, it takes portions of its plasma membrane to form the envelop for the virus.
15Which description is not a Host-virus interaction?
- AAcute or Productive Infection - virus replicates, and produces many virions, the host cell is often killed (lytic infection)
- BLatent Infection - viral genome persists in host cell but does not replicate "provirus"
- CChronic Infection - Virus replicates without causing host cell lysis (cell rupture) and can persist for long periods of time
- DPersistent Infections - release of viruses does not usually harm the host cell resulting in the host cell producing the virus for long periods of time
16What is the difference between chickenpox (acute) and shingles (latent)?
- AChickenpox has lesions at different stages while shingles has lesions at the same stages
- BChickenpox has lesions at the same stages while shingles has lesions at different stages
- CChickenpox has smaller lesions than Shingles
- DChickenpox has bigger lesions than Shingles
17When viruses "transform" normal host cells to cancer cells these cancer cells are called___
- Aoncogenic viruses
- Bmalicious tumour viruses
- Cbenign tumour viruses
- Dtransformative viruses
18Patient specimens added to cultured cells and after a period for growth, observed for cytopathic (CPE) effects on the host cells
- ATrue
- BFalse
19Syncytia is a CPE that takes the cells in a tissue and a causes them to fuse together so that the membrane becomes high with multiple nuclei. The virus then takes over and uses all the resources and then the cell dies. A giant hole is left where the cell would've been.
- ATrue
- BFalse
20Identify the incorrect description of prions
- ACan cause protein misfolding disease
- BPrions are misfolded proteins that act as infectious agents in susceptible animals
- CExamples: Scrapies, Mad cow disease
- DExamples: Rabies, SARS
21What are the 3 types of parasites?
- AProtozoa
- BMetazoa
- CEctoparasites
- DAmoeba
- ELymphocytes
- FMesazoa
22Which statement of protozoans are incorrect?
- ASome have a "cyst form". In order to protect itself from inhospitable environments., it forms a thicker outer layer or a "cyst"
- BThe growing form in many species called "trophozoite"
- CCyst form may also be called an "oocyst" in same types of protozoa
- DIt is a multicellular organisms
23Which one is not a protozoan
- AEntamoeba histolytica
- BGiardia lamblia
- CTrichomonas vaginalis
- DAcanthamoeba
- ECryptosporidium
- FToxoplasma gondii
- GTrypanosoma
- HLeishmania
- IPlasmodium
- JEnterobius vermicularis
24Nosocomial means it is a hospital acquired infection
- ATrue
- BFalse
25Which protozoan has cysts that have a high degree of resistance to chlorine?
- AEntamoeba histolytica
- BGiardia lamblia
- CAcanthamoeba
- DTrichomonas vaginalis
26Which protozoan causes high amounts of flatulence, and cysts that are hardy and have high resistance to chlorine?
- AGiardia Lamblia
- BToxoplasma gondii
- CTrypanosoma
- DSchistosoma
27Choose the correct statement about Trichomonas vaginalis.
- AThere is no cyst stage, it infects person to person through sexual transmission. It is found in the vagina and male urethra and causes intense itching, inflammation of tissues
- BThey are roundworms with complete digestive system (this includes a mouth, intestine and anus). There are two categories/types; eggs as the infective stage, larva as the infective stage.
- CIt causes malaria and has no current vaccine. There are 4 main types that are transmitted by the mosquito and it carries the sporozoite in the saliva which then enters the blood stream and targets the liver.
- DIt is found in domestic cats' feces as oocysts. If another mammal ingests this protozoan, tissue cysts can form. A human can get it from undercooked meat (tissue cysts) or from contact with cat feces (oocysts)
28What are the characteristics of Acanthamoeba sp
- AGrows in water, exists as cyst form in dust
- BOften found in the eye (important for contact lens wearers)
- CEye loss outcome of infection
- DCyst and trophozoite stage in humans
- EObligate intracellular parasite
- FImmunocompromised people can have severe chronic diarrhea while immune-competent people can have serious diarrhea.
- Ghigh resistance to chlorine
- HAbout 20 different species cause this disease, all of which are transmitted by sand flies
- INo good treatment
- JVisceral, cutaneous and mucocutaneous syndromes - caused by different species
29What is the Growing form in a Protozoan called?
- ATrophozoite
- BOocyst
- CCyst
- DUlcer
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- MMI 133 Quiz on MMI Module Exam Unit 3 and 4, created by jamiec2119 on 01/10/2014.
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