Describe The Fluid Mosaic Structure Of Cell Membranes

How do the membranes of cells and the organelles they contain control the movement of materials?

According to the text, cells are the smallest and most basic unit of life.

Cells are organized by the outer cell membrane that separates the watery interior of the cell from the outer environment. Energy is required in order for cells to sustain their functions. One way they may use energy is by conducting photosynthesis to produce chemical energy from sunlight. The membrane systems of cells manage an internal constancy within the cell and different internal components. Proteins allow movement of just the right materials moving in and out of the cells.

1. Describe the fluid mosaic structure of cellular membranes.

The fluid mosaic structure depicts the plasma membrane of animal cells. According to the lesson 6 lecture, animal

5. Describe endocytosis and exocytosis and explain the difference between the two.

Exocytosis is where cells expel materials by vesicles. Vesicles is another way that molecules move in and out of a cell. When the vesicle approaches the cell membrane, a section of the vesicle's membrane fuses with the plasma membrane. This causes the vesicle to open up releasing its contents.

Endocytosis is the opposite of exocytosis. Endocytosis brings material from the outer part of the cell to the inner part of the cell. Endocytosis is either nonspecific of specific. There are three types of endocytosis. One form is receptor-mediated endocytosis, which is where receptor proteins inserted in the membrane identify certain surface characteristics of substances to be included into the cell. Phagocytosis, or "cellular eating," is where particles larger than macromolecules are ingested. Pinocytosis, or cellular drinking," involves the capture of fluids. Pinocytosis is nonspecific and does collect particular