Question

Explain, how the cell wall is selectively permeable, and tell how that's associated with the movement of materials across the membrane?

Answer 1

A cell's cell wall may be a network of lipids and proteins that forms the boundary between the contents of the cell and thus the outside of the cell. It's also known as the cell wall. The cell wall's primary function is to protect the cell from its surroundings.

Complete answer:
Because of ions and molecules, a cell wall is selectively permeable, allowing certain molecules to be transported via active or passive transport.

Movement are often in two ways -
i) Active transport occurs when a number of substances are too large to pass through membranes. Certain channels embedded in membranes attach to those molecules and aid in their movement. They necessitate energy for transportation.

ii) Passive transport entails allowing molecules to move through diffusion (the movement of a substance from a higher to a lower concentration), osmosis (the movement of water molecules against a concentration gradient), and filtration ( capillaries are thin in order that they act as filters to avoid transport of any unwanted substance).

Function of the cell wall : The cell wall has a semipermeable structure (or selectively permeable). It is composed of a phospholipid bilayer as well as other lipids, proteins, and carbohydrates. Each phospholipid has two hydrophobic tails and a hydrophilic head, making it amphipathic. Because the hydrophobic tails face inwards towards each other, the hydrophilic heads face outwards.

Note: Passive transport methods, such as diffusion and osmosis, move nonpolar materials with low relative molecular mass across membranes. Substances diffuse from high concentration areas to low concentration areas, and this process is repeated until the substance is evenly distributed throughout a system.