Viruses,Viroid and Prions

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Viruses,Viroid and Prions by Mind Map: Viruses,Viroid and Prions

1. Host Range

1.1. - determine by presence of specific receptors - example host : 1) invertebrates 2) vertebrates 3) plants 4) protists 5) fungi 6) bacteria

2. Size

2.1. smaller than bacteria

2.2. wide range

2.3. only can be seen using electron microscope

2.4. unit : nm

3. Viral Structure

3.1. nucleic acid

3.1.1. have either DNA or RNA

3.1.2. not both

3.1.3. sense of strand

3.1.4. segmentation

3.2. Capsid

3.2.1. protection and attachment

3.2.2. architecture : - helical -polyhedral -enveloped -complex

3.2.3. example : -icosahedral -pleomorphic -cylindrical

3.3. Envelope

3.3.1. protein

3.3.2. lipids

3.3.3. carbohydrates

4. Virion

4.1. intact,fully assembled and infective virus

5. viroid

5.1. piece of RNA without a protein coat

5.2. plant infected

5.3. smaller than virus

5.4. consists single circular RNA

5.4.1. low molecular weight

5.5. exist inside cell as particles of RNA without capsid

6. DNA viruses

6.1. adenovirus

6.2. papovavirus

6.3. herpesvirus

6.4. hepadnavirus

6.5. release into nuclues of cell

7. RNA viruses

7.1. picornavirus

7.2. togavirus

7.3. rhabdovirus

7.4. retrovirus

8. Bacteriophages

8.1. Replication/Multiplication

8.1.1. lytic cycle

8.1.1.1. cell died

8.1.2. lysogenic cycle

8.1.2.1. remain alive

9. General Characteristics

9.1. - not retained by bacterial filter - not visible-light microscope - intracellular parasite - contain sgle type nucleic acid - protein coat - multply inside living cell

10. Pirion

10.1. resistant to inactivation by heating to 90'c

10.2. not sensitive to radiation

10.3. sensitive to protein denaturing agent - phenol and urea