Lecture 3 Flashcards
What is the magnification of a light microscope?
X1000-1400
What are the three different techniques to study cells?
- light microscope
- transmission electron microscope (TEM)
- scanning electron microscope (SEM)
What is the magnification for a TEM?
Up to x100,000
What picture does a TEM make?
A 2D structure of inside of cell
How much better is a TEM than a light microscope?
100x better
What picture does a SEM make?
A 3D image of the outside of cells
What are the basic features of all cells?
- plasma membrane
- chromosome (carry genes)
- semifinished substances (cytosol)
- ribosomes (make proteins)
In biological classification, what are the three domains?
- bacteria
- archaea
- eukarya
What domains do prokaryotes come under?
- bacteria
- archaea
In biological classification of eukaryotes what are the three kingdoms?
- Plantae
- Animalia
- fungi
What is spontaneous germination?
The appearance of micro-organisms from nowhere
What is Louis Pasteur’s germ theory?
Many diseases are caused by the presence and actions of specific micro-organisms within the body
What is Koch’s postulate 1?
The micro-organism must be found in abundance in all organisms suffering from the disease, but should not be found in a healthy organism
What is Koch’s postulate 2?
The micro-organism must be isolated from a diseased organism and grown in pure culture
What is Kich’s postulate 3?
The cultured micro-organism should cause disease when introduced into a healthy organism
What is Koch’s postulate 4?
The micro-organism must be re-isolated from the inoculated diseased experimental host and identified as being identical to the original specific causative agent
