Lecture 3: Basics of cell science Flashcards
What are the basic components of all cells?
- Plasma membrane
- Cytosol
- Ribosomes
- Chromosomes
What are the three fundamental domains of life:
- Bacteria ( prokaryote)
- Archaea (prokaryote)
- Eukarya (eukaryote)
What are the eukaryote kingdoms?
- Animalia
- Plantae
- Fungi
What is the spontaneous germ theory?
That micro organisms spontaneously appear from non-living organisms.
Define the term resolution:
The minimum distance that can separate two points that still remain identifiable as separate points when viewed under a microscope
Define the term magnification:
The ratio of an object’s size to its real size
What is the germ theory?
It disproved spontanous generation - microorganisms do not spontaneously appear. Theory provided evidence that diseases were caused by microorganisms within the body
What are Kosh’s postulates?
- Organims/agent must be found in every case of the disease
- Agent must be isolated & grown outside of the host
- Inoculate health host, host must get the disease
- Isolate agent in dead host - agent found in dead host
What magnification does the light microscope allow?
1000x
What magnification does the EM microscope allow?
100,000x
How does the light microscope work?
visible light passed through specimen then through lens
- lens refracts the light so image is magnified
How does the EM work?
Focuses a beam of electrons through a specimen or onto the surface.
What does the scanning electron microscope do?
Scans the outer surface of the sample.
- 3D
- black & white
- dead specimen
What does the transmission electron microscope do?
Shows the internal structures of the specimen
- 2D
- black & white
- dead specimen
What does the light microscope do?
Allow the observation of living tissue
