This is the best model of cell processes of small molecules easily passing between the phospholipids in the cell membrane.
So, the correct option is B.
Semi-permeable indicates that certain materials can pass through the cell membrane. Similar to how small molecules can easily pass between the phospholipids in the cell membrane and the holes in the tea bag that allow smaller particles to pass. The phospholipid membrane found in a cell is semi-permeable and composed of lipid bilayers.
A lipid bilayer and some intrinsic and extrinsic proteins are present in the cell membrane or plasma membrane, in accordance with the fluid-mosaic model. It makes it possible for tiny molecules to move freely across the phospholipids in the cell membrane. Due to its ability to regulate what entered and exited, the tea bag's membrane functioned like a cell membrane.
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The given question is incomplete. The complete question is:
A tea bag can model a cell. The fabric of the bag represents the cell membrane. In part of the model, materials move out of the bag and into the water. Which of the following cell processes does this best model?
A. A vacuole opens to release substances into the area outside the
cell
B. Small molecules easily pass between the phospholipids in the cell
membrane.
C. Substances move from an
high concentration
of low concentration to an area of
D. Transport proteins use energy to push large molecules across the
cell membrane
