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Cell wall

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The Fascinating World of Cell Organelles and Their Functions

The cell wall is the outermost covering of a cell, present only in plant cells. It is made up of pectin, hemicellulose, cellulose microfibrils, and proteins organized into two layers - primary cell wall and middle lamella. In many plant cells, a third layer called secondary cell wall, made up of lignin, is present between the primary cell wall and the cell membrane, and provides support, protection, and rigidity to plant cells.

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Animal vs plant cells

A cell organelle is a tiny cellular structure that performs specific functions within a cell, such as a nucleus, mitochondria, ER, ribosomes, lysosomes, and Golgi.

Cell Wall & Membrane

Let’s begin our journey somewhere pleasant: the beach! I thought I could relax for the whole day… until I saw how crowded it was. Just too many people! Nevertheless I must busily search…

Cell Wall Structure and Function

The cell wall is the rigid, semi-permeable protective layer found in some cell types. Plants, animals, fungi, and algae have cell walls.


Spirulina is a blue-green alga known scientifically as Cyanobacteria. It has long been used by the Aztecs, who harvested spirulina to make green cakes. As such, it has become a staple food source for many generations. Its nutritional value continues to be heralded not only on earth but in space as well. NASA has even

The extracellular matrix and cell wall (article) | Khan Academy

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