General Properties Of Viruses Important Notes
1. Features of virus
- Lacks enzymes required for protein and nucleic acid synthesis
- Do not possess cellular organization
- Contains only one type of nucleic acid
- Multiply by a complex process
2. Structure Consists of
- Genome
- Capsid
- Envelope
3. Cultivation of virus
- Animal inoculation
- Embryonated egg inoculation
- Tissue culture
4. Classification of virus
- Enveloped and non-enveloped virus
- Based on their affinity to a different system
- Thermotropic
- Neurotropic
- Pneumotropic
- Viscerotropic
General Properties Of Viruses Long Essays
Question 1. Explain the methods of isolation of viruses.
Answer:
Methods employed for the cultivation of viruses are
- Animal inoculation.
- Embryonated egg inoculation.
- Tissue culture.
- Organ culture
- Explant culture
- Cell culture
Read And Learn More: Microbiology Question and Answers
- Animal inoculation Uses:
- Primary isolation of certain viruses
- To study viral oncogenesis
- To study the pathogenesis of certain viruses.
- Animals used are
- Mice – for arboviruses and coxsackie virus
- Guinea pigs.
- Rabbits
- Routes of inoculation used
- Intracerebral
- Sub-cutaneous
- Intraperitoneal
- Intranasal
- Steps
- Inoculation of animals
- Observation of animals for signs of disease
- Animals are killed
- Their tissues are tested for the presence of virus
- Embryonated egg inoculation:
- Embryonated hen’s eggs are inoculated by different routes
- Tissue Cultures:
- Cell Culture:
- Routinely employed for diagnostic virology.
- Tissues are disassociated into the component cells by the action of proteolytic enzymes such as trypsin.
- Cell cultures are classified into three types based on their origin, and chromosomal characteristics.
- Cell Culture:
General Properties Of Viruses Short Essays
Question 1. Mention the characters of viruses.
Answer:
General Characters of Viruses:
- Viruses are the smallest obligate intracellular infective agents.
- Only one type of nucleic acid either DNA (or) RNA act as their genomes.
- They have no metabolic activity outside the living cells.
- They do not possess a cellular organization.
- They lack the enzymes necessary for protein and nucleic acid synthesis.
- They do not grow in inanimate media.
- They are resistant to antibiotics.
- They multiplied by a complex process but not by binary fusion.
- They are ultramicroscopic particles.
General Properties Of Viruses Short Question And Answers
Question 1. Classification of viruses
Answer:
- Viruses are classified into two major groups based on the nucleic acid they possess
- They are:
Dna Viruses:
- Poxviridae family
- Herpes viridian family
- Adeno viridian family
- Pap ova viridian family
- Parvo viridian family
- Hepadna viridae family
Rna Viruses:
- Picorna viridae family
- Orthomyxo viridian family
- Paramyxo viridian family
- Toga viridian family
- Flavi viridian family
- Rhabdo viridian family
- Retro viridian family
- Corona viridae family
- Filoviridae family