Not all cells are surrounded by a cell wall. Though cell walls are found in plants, fungi, bacteria, and some protists, animal cells lack them. Thus, the statement 'all cells are surrounded by a cell wall' is false.
The statement that 'all cells are surrounded by a cell wall' is false. While it's true that many types of cells do have cell walls, such as those found in plants, fungi, bacteria, and some protists, not all cells do. A prime example of this is animal cells, which lack cell walls. Instead, they are surrounded by a plasma membrane and sometimes an extracellular matrix that provides structural support and signals cellular function.
Cell walls are essential for many cells as they provide a protective layer, giving shape and rigidity, preventing osmotic lysis, and offering support against environmental stresses. The composition of these cell walls can vary greatly, depending on the type of cell. For instance, cell walls can be made of materials like cellulose (in plants and fungi), chitin (in fungi), or various substances in protist and algae cells)
However, even though some cells have cell walls, remember that not all do. So, it's inaccurate to state that every cell has a cell wall surrounding it.
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Carbohydrates are large molecules made up of mono saccharides and are used by organisms for energy storage.
A substance that affects the rate of a chemical reaction is typically referred to as a "catalyst."
A catalyst is a substance that increases the rate of a chemical reaction by providing an alternative reaction pathway with a lower activation energy. The catalyst itself is not consumed in the reaction and remains unchanged at the end of the reaction, making it available for use in subsequent reactions.
Catalysts work by providing an alternative mechanism for the reaction that has a lower energy barrier, allowing the reaction to occur more rapidly. They facilitate the formation of reaction intermediates and transition states, making it easier for the reactants to transform into products.
Catalysts are widely used in various chemical processes, both in laboratory settings and industrial applications, to speed up reactions, improve efficiency, and reduce the amount of energy needed for a reaction to occur. They play a crucial role in fields like chemistry, biochemistry, and industrial manufacturing, enhancing the production of essential materials and products.
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Complete Question is:
A substance that affects the rate of a chemical reaction is ________.