Viruses Flashcards
What kingdom does viruses fall under
Trick question- it is currently not classified
What is a viruses only characteristic of life ?
Reproduction
Is a virus multicellular, unicellular or acellular ?
Acellular
Is a virus prokaryotic or eukaryotic ?
Neither
Small/ simple composition or large and complex composition?
Small and simple composition
How are viruses differentiated ?
By shape
What type of nucleic acid is present in viruses. ?
DNA or RNA
Describe the structure of a pathogenic virus ( that enables protection)
Pathogenic virus contains sheath/ envelope of lipid - reason? To protect it from digestive enzymes
What can a pathogenic virus infect?
Plans , animals or bacterial cells
What do we call viruses that infect bacterial cells ?
Bacteriophage
What are the three structural things absent in viruses ?
No nucleus , cytoplasm or organelles
What do we call viruses that only reproduce inside living cells ?
Obligate intracellular parasites
The term “virus” is used when the organism is _____
Active
The term “virion” is used when the organism is ___
Dormant , no contact with a host cell
The term “ viroid” is used when the organism ____
Causes diseases in plants
Retrovirus ? DNA or RNA ?
Virus with RNA
What are the five stages of reproduction ( virus)
- absorption
- penetration
- latent phase
- latent phase
- lysis
What does the absorption phase in the reproduction of bacteriophage exclude ?
Bacteriophage ( virus) approaches bacteria ( host) , attaches to receptor on cell membrane
Penetration phase in v.reproduction ?
Bacteriophage ( virus) engulfed by endocytosis , then it releases its nucleic acid , injected into host , only left with empty capsid
First latent phase. ?
New virus nucleic acid is formed
Second latent phase
A new bacteriophage w/t protein shield formed
Lysis phase?
Lysis ( breakdown) Bacteria cell bursts and new bacteriophage( virus) is released , host = destroyed
Quick summery one sentence on how a virus reproduces ?
Reproduced by converting genetic material of host into viral nucleic acid , new virus produced
