Virus and Bacteria
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What are the ideal growth conditions of Bacteria?
Water and moist environment, temperature close to 37°C, pH close to 7, Oxygen present, Availability of nutrients, Not easily removed.
What is the difference between a bacteria cell and a human cell?
Bacteria are Prokaryotic, which means they do not have a membrane bound nucleus, and do not have membrane bound organelles
What is a Gram Positive bacteria?
A bacteria with a thick peptidoglycan layer covering the cell, No outer lipid membrane
What is a Gram Negative bacteria?
A bacteria with a thin peptidoglycan layer covering the cell, Has an outer lipid layer covering the cell. - Allows the cell to be protected from antibiotics and lysozyme.
What is an Endospore?
Some gram positive bacteria develop tough coating to protect during high stress- such as freezing, burning, exposure. Autoclaving eliminates Endospores.
What is a Biofilm?
Coordinated functional community of bacteria, protects from antibiotics and desiccation. Provides the bacteria with nutrition and waste excretion.
What is the structure of a Virus?
DNA or RNA in a protein coat, no membrane, no organelle. Unable to metabolise on its own. Protein spikes allow the virus to attach to a host cell.
How does a virus reproduce?
Multiplication by hijacking the host cells and dividing cells.
What are the FOUR types of infection?
Acute lytic, Sub-clinical, Latent, Chronic