Describe how the plasma membrane breaks and reforms during exocytosis and endocytosis. How does the fluidity of the membrane allow this? 1.4.S1 Estimation of osmolarity in tissues by bathing samples in hypotonic and hypertonic solutions. (Practical 2) [The below question is in addition to the lab and is used to test your understanding of the procedure. It is not a replacement for it.] An experiment was carried out to estimate the osmolarity of different varieties of potato. 10mm diameter cores were taken from each variety and their masses recorded. After immersion in different concentrations of sodium chloride solution for six hours the cores were dried and re-weighed. The results are shown below: Concentration Percentage mass change of potato of the sodium cores chloride (+/- 0.01%) solution Variety A Variety B Variety C (+/-0.1M) 13.03 0.0 12.34 14.38 7.73 0.1 5.86 10.14 4.88 0.2 -3.7 6.56 0.81 0.3 -13.34 -0.5 -6.73 0.4 -20.43 -5.73 -13.68 0.5 -24.53 -10.77 Draw and label a graph to show the results. Your graph should include descriptive axis titles and linear best fit trend lines. (If graph plotting software is used then paste in the printed graph below)
Describe how the plasma membrane breaks and reforms during exocytosis and endocytosis. How does the fluidity of the membrane allow this? 1.4.S1 Estimation of osmolarity in tissues by bathing samples in hypotonic and hypertonic solutions. (Practical 2) [The below question is in addition to the lab and is used to test your understanding of the procedure. It is not a replacement for it.] An experiment was carried out to estimate the osmolarity of different varieties of potato. 10mm diameter cores were taken from each variety and their masses recorded. After immersion in different concentrations of sodium chloride solution for six hours the cores were dried and re-weighed. The results are shown below: Concentration of the sodium chloride solution (+/-0.1M) Percentage mass change of potato cores (+/- 0.01%) Variety A Variety B Variety C 0.0 12.34 14.38 13.03 0.1 5.86 10.14 7.73 0.2 -3.7 6.56 4.88 0.3 -13.34 -0.5 0.81 0.4 -20.43 -5.73 -6.73 0.5 -24.53 -10.77 -13.68 Draw and label a graph to show the results. Your graph should include descriptive axis titles and linear best fit trend lines. (If graph plotting software is used then paste in the printed graph below)
biokdpnotes1-140825001510-phpapp02.docx