1.4 understand the term pathogen and know that pathogens may include fungi, bacteria, protoctists or viruses
Pathogen: a biological agent that causes disease or illness to its host.
↳may include fungi, bacteria, protoctists or viruses.
Viruses:
- not living
- small particles, smaller than bacteria
- parasitic and can reproduce only inside living cells
- they infect every type of living organism
- have a wide variety of shapes and sizes
- they have no cellular structure but have a protein coat and contain one type of nucleic acid, either DNA or RNA.
- examples include the tobacco mosaic virus that causes discolouring of the leaves of tobacco plants by preventing the formation of chloroplasts, the influenza virus that causes ‘flu’ and the HIV virus that causes AIDS.
↳may include fungi, bacteria, protoctists or viruses.Viruses:
- not living
- small particles, smaller than bacteria
- parasitic and can reproduce only inside living cells
- they infect every type of living organism
- have a wide variety of shapes and sizes
- they have no cellular structure but have a protein coat and contain one type of nucleic acid, either DNA or RNA.
- examples include the tobacco mosaic virus that causes discolouring of the leaves of tobacco plants by preventing the formation of chloroplasts, the influenza virus that causes ‘flu’ and the HIV virus that causes AIDS.
Comments
Post a Comment