BIOLOGY | Lesson 1 | Microscopes and Cell Theory Flashcards
What did Hans & Zacharias Janssen contribute to the discovery of microscopes?
Created the first compound microscope
What did Robert Hook contribute to the discovery of microscopes?
- Created a hand-held compound microscope
- Discovered plant cells
What did Antoni Van Leeuwenhoek contribute to the discovery of microscopes?
- Saw moving cells (bacteria) using a single-lens microscope
Definition of:
Spontaneous Generation
The idea that life could emerge spontaneously from non living matter
Definition of:
Simple microscope
A microscope that only uses 1 lens
Definition of:
Compound microscope
A microscope that uses 2 or more lenses
What does the coarse adjustment on a microscope do?
Adjust the stage height
What does the fine adjustment on a microscope do?
Adjust the lens focus
Why do cells need to be stained when viewing them on a microscope?
So the cells can actually be seen
Why does the specimen being viewed on a microscope have to be thin?
So enough light can pass through to the eyepiece
What are some examples of spontaneous generation
- Flies come from rotting meat
- Mice come from moldy cheese
Who disproved spontaneous generation?
Louis Pasteur
What did Robert Brown contribute to cell theory?
- Identified cell structure
- Identified the importance of the nucleus
What did MJ Schleiden contribute to cell theory
All plants are composed of cells
What did Theodor Schwann contribute to cell theory?
All animals are composed of cells
