BIO 1140 Lecture Notes - Lecture 7: Gap Junction, Spindle Apparatus, Cell Membrane
5 Mar 2018
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Document Summary
Movement: either to attract the surroundings (nutrients) or movement of the cell around its environment. Cilia, movement begins right at the plasma membrane. Flagellum have a rigid portion right at the base but is longer, motion can be almost propeller like, rotary. Length: flagella are much longer, cilia usually short. Nine doublets in a circular structure, two in the middle. Why would doublets slide apart if there was no anchor? (nexin) As dyneins are heading towards the plasma membrane, the doublets would slip apart. Because the the dyneins are tied together, they don"t slide apart but rather sway back and forth in a whiplike motion. Cell to cell interactions junctions: tight junctions, anchoring junctions, gap junctions made of 6 protein subunits that span across both layers of plasma membrane. They change how they are oriented within the membrane, which can change the overall shape within a gap junction.
