VCE Stuff > VCE Biology
Random biology questions before the exam
lanvins:
1. Explain the difference between the patterns of growth of bacteria and viruses after infection of an organism.
2. How does a vaccination give rise to memory T-cells?
memka:
--- Quote from: lanvins on June 10, 2008, 10:51:23 am ---1. Explain the difference between the patterns of growth of bacteria and viruses after infection of an organism.
--- End quote ---
Hmmm..something to do with bacteria have their own genetic material so they can reproduce by binary diffussion,
whereas viruses must take over the host cell to reproduce maybe?
--- Quote from: lanvins on June 10, 2008, 10:51:23 am ---2. How does a vaccination give rise to memory T-cells?
--- End quote ---
A vaccine contains a weakened form of the pathogen (which still has normal antigens).
This causes an immune response to the weakened pathogen, phagocytes engulf the pathogen and present it's antigens to T helper cells.
The Th cells stimulate other B and T cells some of which differentiate into memory cells specific to the pathogen.
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