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The cell membrane, also called the plasma membrane or plasmalemma, is a semipermeable lipid bilayer common to all living cells. It contains a variety of biological molecules, primarily proteins and lipids, which are involved in a vast array of cellular processes.
- Types of Plant Cells
Plants have three primary cell types and these cell types...
- 3.8: Cell Structures and Organelles
Above is a cell from the aquatic plant Elodea. The cell...
- 4.1: Diffusion and Osmosis
Osmosis is the movement of water across a semipermeable...
- Types of Plant Cells
Above is a cell from the aquatic plant Elodea. The cell wall, nucleus, and chloroplasts are visible. Draw a cell from the Azolla in the space below. Label the cell wall, plasma membrane, cytoplasm, chloroplasts, nucleus (if you see it), central vacuole, and tonoplast.
30 lip 2022 · Osmosis is the movement of water across a semipermeable membrane (such as the cell membrane). The tonicity of a solution involves comparing the concentration of a cell’s cytoplasm to the concentration of its environment.
In animal cells, the plasma membrane barrier can be distinguished due to differences in light refraction across the membrane. Light travels slower in the dense cytoplasm than it does in the much less dense bathing solution.
In this demonstration, the aquatic plant called Common Waterweed, Elodea canadensis, serves as a model for cell function. The plant clearly exhibits cell activity by visibly dem-onstrating cytoplasmic streaming, which occurs in animals, plants, and protista.
Define cell membrane, cell wall, and chloroplast. Remove an Elodea leaf and place it in the middle of a microscope slide. Using a pipette, drop fresh water on top of the Elodea to cover the leaf.
Pick off an entire healthy looking Elodea leaf, with fingers or small scissors and place it on the microscope slide. Add a drop of water (hypotonic solution) and a coverslip and observe the chloroplasts (green structures) and the cell walls.
