pathogens 1.4 Flashcards
1
Q
what’s a pathogen?
A
a microorganism that causes diseases, they harm the host by releasing damaging cells or toxins
all viruses are pathogens
bacteria, protoctista, fungi can also be pathogens
2
Q
what’s a virus?
A
a non-living organisms
only reproduce inside host cells (parasitic) - take over ribosomes and enzymes to make new virus particles.
they have no cells
contain a protein coat and strand of (genetic material) nucleic acids (DNA RNA)
3
Q
examples of viruses:
A
tobacco mosaic virus
-causes discolouration of the leaves of tobacco plants by preventing the formation of chloroplasts and limiting plant growth
influenza virus
-causes flu
HIV virus
-causes AIDS
- weakens the immune system
