Essay on Organelles And Their Functions Within A Cell

1254 Words Apr 29th, 2015 6 Pages
Cells have specific structures within them that allow them to carry out their functions; these structures are called organelles. Organelles have different functions within a cell that is called Division of Labor. They are also classified in two different groups, membranous and non-membranous. Membranous organelles are surrounded by a membrane while of course, non-membranous are not surrounded by a membrane. When describing the organelles and their function, first will be the membranous organelles. The largest and most important membranous organelle is the nucleus. The nucleus contains a dense structure called the nucleolus and surrounded by a double membrane called the nuclear envelope. The nuclear envelope has little holes in it called pores; these pores allow some molecules to enter the nucleus and keep other molecules out. The communication between the nucleus and the rest of the cell through the pores has a major effect on what the cell looks like as well as well as its function. DNA and proteins make up chromatin fibers; each very long fiber is one chromosome. Components of ribosomes are made up in the nucleolus. The Endoplasmic Reticulum (ER) is one of the main manufacturing facilities in a cell, is found near the nucleus, and is made up of flattened cells sacs called Cisternae, which are continuous with the Nuclear Envelope. The rough endoplasmic reticulum gets its name because of the ribosomes that are attached to its surface. There is also a smooth…

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