Cell Theory + Scientific Process Flashcards
Who came up with the term cell/cellulae?
1665: Robert Hooke
What is cell theory?
Cells are the fundamental units of life
All life is composed of cells (1 or more)
What did Antoni Van Leeuwenhoek contribute?
Cells move
Who put forth cell theory?
1830
Botanist Matthias Jakob Schleiden
Zoologist Theodor Schwann
What did Rudolf Virchow contribute?
1858
All living cells arise from preexisting cells
Cells do not spontaneously generate
What did Louis Pasteur contribute?
1862
Disproved spontaneous generation
Microorganisms only come from microorganisms
Swan neck flasks
Scientific literacy
Capacity to evaluate/pose arguments based on evidence and apply conclusions to arguments
Pasteur’s Experiment (identify parts)
Dependent variable
- # of microorganisms
Independent variable
- flask neck
Standardized variable
- flask type
- sterilization
Control
- unbroken swan neck
Hypothesis
- microorganisms come from other microorganisms , not spontaneous generation
Experimental prediction
- The water will have microorganisms
Prokaryotic Cell
Unicellular organism
No nucleus
No membrane bound organelle
Where is prokaryotic dna located?
The Nucleoid
Eukaryotic cell
Has membrane bound nucleus
Has membrane bound organelles (mitochondria etc)
More complex than prokaryotic cell
Order the hierarchical classification (S-L)
Species (S-L)
Genus
Family
Order
Class
Phylum
Kingdom
Domain
Darwins contribution
Evolution happens through natural selection
Did not come up with evolution
Characteristics are hereditary (not random)
What did (gregor) mendel contribute?
1866
Rediscovered in 1900s
Discrete heritable factor
Genes come in pairs and are inherited as distinct units
One from each parent
Retains individuality generation after generation
Watson, Crick, Wilkins
1953
Discovered the shape of dna helix
Rosalind franklin contributed
