Cell Membrane Coloring Worksheet Biology
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this time will discuss about cell membranes which include understanding, function, structure, nature and also membrane transport, for more details see the description below.
Understanding Cell Membranes
Cell membrane is a universal feature possessed by all types of cells in the form of an interface layer called the plasma membrane, which separates cells from the environment outside the cell, in order to protect the cell nucleus and the survival system that works inside the cytoplasm
Cell Membrane Function
Where various chemical reactions take place.
Protect cell parts and give shape to a cell
As a receptor in a stimulus intended for a cell.
Cell membrane can be a medium of communication between the environment in the cell with the environment outside the cell
Selecting various substances that enter and exit the cell.
Cell membrane constituent components include:
Generally, cell membranes have hydrophilic polar head parts with glycerophosphorilester binding capacity consisting of phosphate, glycerol, and additional groups such as choline, serine, etc .; with two hydrophobic chains of fatty acids that form an ester bond.
The naming and properties of the phospholipid head depend on the type of additional group they have, as they are called
Membrane integral protein
Integral protein has a domain stretching outside the cell and in the cytoplasm. Intregral protein also has a function to enter substances that are larger in size.
This protein is integrated in the lipid layer and penetrates 2 lipid / transmembrane layers. Amphipatic, has a helix protein sequence, hydrophobic, penetrating the lipid layer, and hydrophilic amino acid strands. Many of them are glycoproteins, sugar groups on the outside of cells.
Membrane framework or commonly referred to as cytoskeleton has three types, namely:
Properties of Cell Membranes
Cell membranes have dynamic and asymmetrical properties.
Cell membranes have dynamic properties because they have a structure like water that allows lipid molecules and proteins to move.
Cell membranes have asymmetrical properties because the composition of proteins and lipids on the outside is not the same as the composition of proteins and lipids on the inside of cells.
Based on its ability, the nature of cell membranes is divided into 3 types:
That is the nature of the membrane that does not allow any substance outside the cell to enter the cell.
It is a trait in which all substances can pass through the cell membrane to enter the cell. This property is usually owned by damaged or nearly dead cell membranes so that cells cannot survive.
A condition where only certain substances that are needed by cells that can enter the cell. Usually normal cell membranes have semipermeable properties.
passive membrane transport
It is a molecular exchange process that occurs spontaneously and automatically without the need for special mechanisms. Generally active transport occurs in molecules that can pass through cell membranes at any time. Usually the cause of passive transportation is the change in concentration gradient of the molecule.
Namely the movement of molecules from an area with a high concentration to another area with a lower concentration due to the kinetic energy of these molecules.
That is the diffusion of each solvent through a differential permeable membrane. Universal solvent is water.
Is the opposite of passive transport and is not spontaneous. This direction of transport movement is against the concentration gradient. Active transport needs help from some proteins. For example proteins involved in active transport are channel proteins and carrier proteins, and ionophores. Ionophores are antibiotics that induce ion transport through cell membranes and artificial membranes
Cell Membrane Permeability
Membrane permeability is commonly known as molecular permeant. Permeability depends on the electric charge and the polarity of the molecule and to a lesser extent the molecular molar mass. Due to its hydrophobic nature, small molecules are neutral in charge. The inability of the charged molecule to pass through the cell membrane results in the pH partitioning of body fluid compartments.