Davson-Daniel Model Lab Report

Evidence for and against the Davson- Danielli model of membrane structure The plasma membrane is thin and has double layers. The plasma membrane has two dark lines and a lighter central region. The two dark lines suggests the presence of the protein on either side. The lighter central region suggests the presence of phospholipids. The dark grainy appearance could be the ribosomes. Ribosomes appear as dark granules in the cytoplasm. Measured by rule: approximately 1 mm actual size 10 nm (image size)/(actual size)=
Change 1 mm to nanometres. 1mm=1000000 nm
1000000nm/10nm=

100,000

Data based questions a. Nuclear pores.
b. The pores transport molecules between nucleus and cytoplasm. This is the outer nuclear membrane because the phosphate heads (dark line) are visible and they are the ones which face water on either sides. …show more content…
The second and third ones are in the left top corner next to each other. There is the presence of the Golgi apparatus. The Golgi apparatus is found in the cytoplasm (they are about two of them). The Golgi apparatus is responsible for making the proteins which are later transported by vesicles to the plasma membrane. There are also ribosomes present. The ribosomes synthesize protein, releasing them to work in the cytoplasm as enzymes or in other ways.
Diffusion of proteins in membranes
Time after fusion/minutes Cells with markers fully mixed % Result 1 Result 2 Result 3 Result 4 Mean
5 0 0 - -