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Cell structure Typeit

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Eukaryotic cells contain membrane-bound organelles. For example, the sorts and modifies lipids and proteins that it receives from the endoplasmic reticulum via vesicles. These move throughout the cell using the , which also supports the cell and enables it to move. Another example of a membrane-bound organelle is , the organelle of photosynthesis, which is not present in animal cells.

Prokaryotic cells share some of the same features as eukaryotic cells, but they are generally much in size. Rather than having a to store their genetic information, they usually have a single circular DNA molecule, and they may also have one or more . Some bacterial cells also have a surrounding to protect them from damage.

Microscopes can be used to study cells by making them appear larger. Electron microscopes, which either pass electrons through a specimen in electron microscopes or bounce electrons off the surface of specimens in electron microscopes, have a higher resolution than microscopes, so they give a clearer image. However, they also have many difficulties associated with them, such as the fact that they need to be used in a vacuum, and so specimens cannot be viewed using them. microscopes do not have this problem, and are best for viewing different layers of a 3D object at high contrast.

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