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Virus

Virus leaving cert biology

QuestionAnswer
from which biochemical components are viral coats (capsids) made of? protein
Name the other main chemical component of a virus Nucleic acid (either RNA or DNA)
why can virus's be described as obligate parasites can only reproduce in a host cell
describe how viral particles can infect and replicate in a host cell Virus attaches to host cell. Nucleic acid pushed in through a hole created in the cells membrane. Nucleic acid inactivates host DNA and orders the production of new virus components by the host organelles. new viruses are assembled. Host cell bursts-lysis
give one difference between active and passive immunity Active is longer lasting than passive
name one virus that causes disease in plants tobacco mosaic virus
how do scientists distinguish between different types of virus's shape of protein coat
Virus are difficult to classify into a kingdom. Why is this so? no cell organellas
Give one way in which virus's are beneficial to humans Research into bacteriophage as an alternative to antibiotics to kill bacteria.
name the three different shapes viruses can be round, rod, complex
Give an example of a round virus rabies
Give an example of a rod virus tobacco mosaic virus
Give an example of a complex virus bacteriophage
A virus has been described as a piece of genetic material that has escaped from a cell. Give one piece of evidence to support this description Composed of Nucleic Acid
Explain why younger people might be more at risk to becoming ill from swine flue than older people older people might have previous exposure
Comment on the difficulty of defining viruses as living organisms Contain only one type of Nucleic Acid not both, non-cellular, obligate parasites
name two diseases caused by viruses Polio, rabies
why should antibiotics not be prescribed to a person suffering from a viral infection antibiotics have no effect on viruses
Created by: sadhbh 1
 

 



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