21/11/14
 We have our class today with Dr Wan at 2.2 Biotech 2.We learn about virus.Virus is not living organism until take over host.Virus is major causes of disease.
 Acellular Agents

  • Viruses-protein and nucleic acid
  • Viroids-only RNA
  • Satellites-only nucleic acid
  • Prions-protein only
Example of disease cause by Prion is Kuru. Kuru occured in Papua New Guinea because of tradition to eat dead family member brain.

Most virus is in hydrosphere Mostly in marine and sea.
The virus can be grow in embryonated egg.
pic from: http://www.virology.ws/wp-content/uploads/2009/12/viruses_in_eggs.jpg

Virus is important in evolution.One of the evolution of virus is ebola virus.During 2008 the host is monkey but now the host is bat.

Bacteriophages,bacterial virus kill only bad bacteria. It kill pathogenic bacteria in poultry.

Before this I thought that virus only cause disease but now I know that virus also can also kill bad bacteria.ow I also know that virus have many different type of structure.

What I have learn:
-Virus  major cause of virus
-Bacteriophages kill only bad bacteria


We continue our class with Datin Khadijah at 11 am.We learn about genetic recombination.Genetic recombination refers to arrangement of DNA from separate groups of genes.It usually involves DNA from different organisms.
Genetic Transfer in prokaryotes

  • Transformation-gene transfer from one bacterium to another as naked DNA in solution.Refer to Griffith's experiment
  • Transduction -Dna transferred fromdonor to recipient via bacteriophage.
  • Conjugation-require contact between donor and recipient cell
Plasmid transfer
pic from: http://www.scienceprofonline.com/images/Conjugation.png
 
Chromosome transfer


After this class I got to know that DNA transformation occur in many ways.The different transformation ,different product.

What I have learn:
-DNA from virulent can enter avirulent
-There are two types of transduction that are Generalized and Specialized Trasduction
-In plasmid transfer sex pilus formed

 
 






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