State the precise location of the cell membrane in plant cells? With what type of cell do you associate membrane-bound organelles? What corresponding term is used to describe bacterial cells? The cell membrane is described as being selectively permeable - Leaving Cert Biology - Question 14 - 2011

Membrane-bound organelles are associated with eukaryotic cells.

Bacterial cells are described as prokaryotic.

Being selectively permeable means that the cell membrane regulates the passage of substances, allowing only certain molecules to pass through while restricting others.

Diffusion is called passive transport because it does not require energy input (ATP) from the cell; substances move from areas of higher concentration to lower concentration naturally.

Osmosis is a special case of diffusion specifically concerning water molecules. It refers to the movement of water across a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration.

To demonstrate osmosis in the laboratory, a container with two solutions separated by a semipermeable membrane can be used. One solution should be a concentrated salt solution, and the other should be a less concentrated solution. The diagram should include labels for the membrane, the plant tissue, and the solutions. The expected result is the movement of water from the less concentrated solution to the more concentrated one, showing how osmosis occurs across the membrane.

The structure that allows Amoeba to eliminate excess water is called the contractile vacuole.