Class notes
Class notes Cell Biology (BIOL2020)
- Course
- Cell Biology (BIOL2020)
- Institution
- Dalhousie University (Dal )
Cells are small, -Why are cells tiny? Cells evolve. -Is Spontaneous Synthesis of biological materials possible?
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Lecture 1c: Fundamental TruthsTruth 1
Cells are small
- micrometers (m)
- 100 microns in 1 mm.
- eukaryotic = 10-30 m (100)
- prokaryotic = 1-5 m
cell structures in nanometers (nm)
- 1000 nm in 1 um
- frog egg = visible,
eukaryotic cell= microscope
virus /ribosome = electron microscope
Electron microscopes (EM)
-1950s
- beam of electrons
- TEM (through specimen to cell organelles) Vs SEM (to give 3D image)
Cells small but neurons long
multinucleated cell big
ex: Slime mold
-Why are cells tiny?
1. Surface Area: volume Ratio
Small = membrane can keep up with internal demands
1. diffusion rates of molecules
Truth 2
1 cell biology reductionist (complex subject in simple
Parts.)
2 cells carry out chemical reactions
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