Mb C10 Self Quiz

tokia's version from 2016-04-29 04:06


Self Quiz 10


Question Answer
1. Viruses range in size from the smallest known _____ group which are less than 30 nm to the largest which are approximately _____ nm or about the size of the smalles bacteriaEnterovirus/300
2. CapsidSurrounding protein coat
VirionComplete virus particle including envelope if it has one
SpikeProjection made of glycoprotein that serves to attach virions to specific receptor
EnvelopeSurrounding lipid bilayer membrane
Naked virusVirus with a nucleocapsid but no envelope
NucleocapsidVirions genome together with capsid
3. A chemical component that is found in all viruses isProtein
4. A common polyhedral capsid shape of viruses is aIeosahedron
5. (t/f)Viruses are capable of infecting all life forms some can even infect members of different kingdoms but nost are limited to only one host and to only specific cells and/or tissues of that hostTrue
6. Enteroviruses differ from rhinoviruses mainly in theirAbility to survive neidie conditions
7. Which of the following properties do viruses have in common with the bacterial section containing Rickettsiae and ChlamydiaeThey are both obligate intracellular parasites
8. Viruses that can remain latent (usually in neurons) for many years are most likelyHerpesviruses
9. What type of viruses contain the enzyme Lysozyme to aid in their infectionBacteriophages
10. Viruses that ifect bacteria are calledBacterioviruses
11. Bacteriophages are readily counted by the process ofPlaque assays
12. A type of cell culture that can reproduce for an extended number of generations and is used to support viral replication is aContinuous cell line
13. Which of the following is not a DNA virusOrthomyxovirus
14. All of the following are true about retroviruses exceptRetroviruses have two complete copies of (-) sense RNA
15. ReleaseDeparture of new virions from host cell generally with lysis of host cell...5
AdsorptionAttachment of viruses to host cell...1
MaturationAssembly of newly synthesized viral components into complete virions...4
PenetrationEntry of virion genome into the host cell...2
SynthesisHost metabolic machinery is used to produce new nucleic acid molecules capsid proteins and other viral components...3
16. Bacteriophages that can enter into stable long term relationships with their hosts are calledTemperate phages
17. The positive (+) strand RNA of certain viruses does not act as a message but becomes converted into DNA and integrated into the host cellular DNA.These viruses areRetroviruses
18. The replication of animal viruses differs from the replication of bacteriphages in what way(a) Once in a host cell animal viruses undergo a process of "uncoating" whereby the viral genome is separated from its protein coat by proteolytic enzymes :The viral genome in a bacteriphage is ready to go once injected into the bacterial host cell. (b) Compare to bacteriophage replication synthesis in animal virus replication can take much longer (c) In the penetration stage bacteriphages produce lysozime to weaken the bacterial cell wall and inject their DNA through the tail core into the bacterial cell (d) The maturation stage in animal envelope viruses is longer than that of bacteriophage replication
19. In what way do animal viruses differ from each otherThe RNA in RNA viruses can have different functions depending on the tyoe of virus whereby it can be used as a template for protein synthesis mRNA production or DNA production...Depending on the type of virus release can occur through either lysis or by budding through the host membrane
20. Continuous cell lineImmortalized cells that reproduce for an extended number of generations
Primary cell cultureCells that come directly from the animal have very few cell divisions but support the growth of a wide variety of viruses
MonolayerTrypsinized and washed cells that attach to plastic surfaces where they multiply and spread to form sheets one cell thick
SubculturingCells from an existing cell culture are transferred to new containers with fresh nutrient media
Cytopathic effectVisible effects viruses produce in infected hosts cells
Diploid fibro-blast strainImmature fetally derived cell type that rapidly divides numerous times and supports a wide range of viruses
21. Creutzfeld-Jakob disease...kuru...scrapie and mad cow disease are caused byPrions
22. The human virus that has been associated with Burkett's lymphoma (a malignant tumor of the jaw) isEpstein-Barr virus
23. Prioninfectious incorrectly folded protein
SatelliteSmall single-stranded RNA virus lacking genes required for its replication and needing a helper virus
VirusoidHelper virus codes for its capsid
Satellite virusescode for their own capsid protein
ViroidsSimilar to viroids and virusoids a defective pathogen requiring the presence of hepatitis B virus for its replication
Delta hepatitis virusInfectious RNA particle smaller than a virus
24. Viruses that can induce defects during embryonic development (teratogenesis) in human areHerpes simplex virus types I and II... Rubella...Cytomegalovirus
25. Which is not true regarding viruses and cancerAll neoplasms are malignant
26. Identify parts (a) through (e) of the following phage growth curve and describe what happens in each phasePhage growth (a) Latent period time from penetration through maturation (b) Eclipse period time from penetration through biosynthesis (c) Viral yield (burst size) number of phage progeny released form one host cell