BIO 1140 Lecture Notes - Lecture 36: Microtubule, Amphiphile, Tubulin
24 Aug 2016
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A: lipid binding to rna to regulate structure. B: protein binding to dna to initiate transcription. C: lipids serving to anchor proteins in the plasma membrane. D: carbohydrates and protein as elements of cellular recognition. The presence of cholesterol contributes to the plasma membrane"s fluidity because they act as a buffer. When there is cholesterol, they take up space between the lipids and therefore make it more fluid. Low temperature = high cholesterol = increase distance between pl = more fluid. High temperature = low cholesterol = decrease distance between pl = more rigid. The temperature effects the fluidity because at a higher temperature, the membrane becomes more fluid and at a lower temperature, the membrane becomes less fluid and therefore more rigid. To compensate for high temperature, the enzymes that introduce double bonds are slowed down to increase saturation and decreases fluidity and vice versa for low temperature.
