Examlex
Below is a 2D chromatogram that shows the separation of five amino acids.In this technique,the amino acid mixture is first separated by chromatography using a polar solvent system.Then the plate is rotated 90°,and the amino acids are further separated by electrophoresis.Identify the spots obtained from a mixture of Trp,Glu,Lys,Ile and Thr.A table with isoelectric points is included to aid in solving this problem. amino acid-pI value Trp-5.9
Glu-3.2
Lys-9.7
Ile-6.0
Thr-5.6
Plasma Membrane
A semi-permeable membrane found in cells that separates the interior of the cell from its external environment and regulates the movement of substances in and out of the cell.
Depolarization
The reduction of a cell's membrane potential, making it more positive, and initiating action potentials.
Permeability
A measure of the ability of a substance to allow liquids or gases to pass through it.
Absolute Refractory Period
A period immediately following the firing of a nerve fiber when it cannot be stimulated no matter how great a stimulus is applied.
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