BIOL 2020 Lecture Notes - Lecture 3: Cytoskeleton, Cyanobacteria, Nucleoid
18 Jan 2019
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Document Summary
Basic properties of all cells: cells are small: 1000 microns in 1 mm (i. e. 10^-6 m) Most eukaryotic cells are between 10-30 microns, up to 100 microns. Most prokaryotic cells are about 1-5 microns: nanometers: There are 1000 nm in 1 micrometer (i. e. 10^-9 m) Cell components are measured either in microns or nanometers: angstrom: There are 10 angstroms in a nm (10^-10m) When talking about cell size or large organelles always micrometers. When we look at internal structures, we use nanometers. We will rarely refer to angstroms, but they are used to describe biological structures (i. e. proteins). Plant cell or animal cell or a bacterium. If we are looking at structures inside (ribosomes, membranes, microfilaments), we are always talking about nanometers. Naked eyes (younger eyes) can see about 1mm to half a mm (a speck). A frog egg (the biggest cell 2. 5 mm) is easily visible.
