Viruses<br />IB Biology<br />
True or false?<br />
Introduction to viruses<br />Smallest living organisms (20nm-300nm)<br />Obligate parasites<br />Only reproduce in living ...
Different Shapes<br />Helical<br />Polyhedral<br />Enveloped<br />Bacteriophage<br />
Functions of capsid and envelope<br />Protecting the nucleic acid from enzymes and chemicals when virus is outside host ce...
Methods of entry into host cell<br />Direct translocation across the membrane<br />Fusion of viral and cell membranes<br /...
Retroviruses<br />Have RNA not DNA<br />Use reverse transcriptase to change:<br />single strand RNAdouble strand DNA<br />
What is a cDNA library?<br />complimentaryDNA (cDNA)<br />cDNA created from mRNA using reverse transcriptase<br />cDNA lib...
Gene Therapy and Viruses<br />
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Viruses

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IB Biology Option F SL

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Viruses

  1. 1. Viruses<br />IB Biology<br />
  2. 2. True or false?<br />
  3. 3. Introduction to viruses<br />Smallest living organisms (20nm-300nm)<br />Obligate parasites<br />Only reproduce in living cells<br />Viruses transferred between cells as inert particles known as virions<br />
  4. 4.
  5. 5. Different Shapes<br />Helical<br />Polyhedral<br />Enveloped<br />Bacteriophage<br />
  6. 6. Functions of capsid and envelope<br />Protecting the nucleic acid from enzymes and chemicals when virus is outside host cell<br />Binding to the surface of the host cell<br />Assisting in penetration of the host cell<br />
  7. 7. Methods of entry into host cell<br />Direct translocation across the membrane<br />Fusion of viral and cell membranes<br />Uptake by phagocytosis/endocytosis<br />virus<br />Host cell membrane<br />
  8. 8. Retroviruses<br />Have RNA not DNA<br />Use reverse transcriptase to change:<br />single strand RNAdouble strand DNA<br />
  9. 9.
  10. 10. What is a cDNA library?<br />complimentaryDNA (cDNA)<br />cDNA created from mRNA using reverse transcriptase<br />cDNA library : complete set of all the molecules contained within a cell or organism<br />
  11. 11.
  12. 12. Gene Therapy and Viruses<br />

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