Write the functions of golgi complex and cell membrane
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Answer:
Golgi complex --- it's major function to modify,packaging and sorting of proteins for secretion. it is also involved in transport of lipids around the cell.and creation of lysosomes.
cell membrane -- it controls the movement of some organells in and out of the cell .it selectively permeable membrane toions and organic molecules......
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Answer:
Golgi apparatus
Golgi apparatus, also called Golgi complex or Golgi body, membrane-bound organelle of eukaryotic cells (cells with clearly defined nuclei) that is made up of a series of flattened, stacked pouches called cisternae. The Golgi apparatus is responsible for transporting, modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations. It is located in the cytoplasm next to the endoplasmic reticulum and near the cell nucleus. While many types of cells contain only one or several Golgi apparatus, plant cells can contain hundreds.
Cell Membrane Definition
The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm (the contents of the cell) from its surrounding environment. It is selectively permeable, which means that it only lets certain molecules enter and exit. It can also control the amount of some substances that go into or out of the cell. All cells have a cell membrane.
Function of the Cell Membrane
The cell membrane gives the cell its structure and regulates the materials that enter and leave the cell. Like a drawbridge intended to protect a castle and keep out enemies, the cell membrane only allows certain molecules to enter or exit. Oxygen, which cells need in order to carry out metabolic functions such as cellular respiration, and carbon dioxide, a byproduct of these functions, can easily enter and exit through the membrane. Water can also freely cross the membrane, although it does so at a slower rate. However, highly charged molecules, like ions, cannot directly pass through, nor can large macromolecules like carbohydrates or amino acids. Instead, these molecules must pass through proteins that are embedded in the membrane. In this way, the cell can control the rate of diffusion of these substances.
Another way the cell membrane can bring molecules inside it is through endocytosis. This includes phagocytosis (“cell eating”) and pinocytosis (“cell drinking”). During these processes, the cell membrane forms a depression and surrounds the particle that it is engulfing. It then “pinches off” to form a small sphere of membrane called a vesicle that contains the molecule and transports it to wherever it will be used in the cell. Vesicles are also created from the cell membrane when endocytosis is not occurring, and are used to transport molecules to different areas within the cell. Cells can also get rid of molecules through exocytosis, which is the opposite of endocytosis. During exocytosis, vesicles come to the surface of the cell membrane, merge with it, and release their contents to the outside of the cell. Exocytosis removes the cell’s waste products– parts of molecules that are not used by the cell.
The cell membrane also plays a role in cell signaling and communication. Receptor proteins on the cell membrane can bind to molecules of substances produced by other areas of the body, such as hormones. When a molecule binds to its target receptor on the membrane, it initiates a signal transduction pathway inside the cell that transmits the signal to the appropriate molecules. Then, the cell can perform the action specified by the signal molecule, such as making or stopping production of a certain protein