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Below is an essay on "Cells" from Anti Essays, your source for research papers, essays, and term paper examples.

Cells are so small that they are not directly visible to the naked eye, for this purpose, microscopes are used. Cells are studied with the help of a compound microscope, but some cells are so small that an electron microscope is needed to study them.
Compound Microscopes are so called because they are designed with a compound lens system.  The objective lens provides the primary magnification which is compounded (multiplied) by the ocular lens (eyepiece).  Visual information produced by compound microscopes are two dimensional, as opposed to those produced by stereomicroscopes which are three dimensional.  Most provide an image which is upside down and backward as compared to the actual orientation of the object.  Compound microscopes usually have several objectives in magnifications ranging from about 4x to 100x.  Eyepieces are commonly 10x resulting in total magnifications of 40x to 1000x (Objective x Eyepiece). Compound microscopes may be upright or inverted.  There are a variety of microscopy techniques available for compound microscopes.
An electron microscope uses condensing lenses to focus a beam of electrons to illuminate a specimen and produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons. They can achieve better than 50 pm resolution[1] and magnifications of up to about 10,000,000x whereas ordinary, non-confocal light microscopes are limited by diffraction to about 200 nm resolution and useful magnifications below 2000x.The electron microscope uses  electrostatic  and  electromagnetic "lenses" to control the electron beam and focus it to form an image. An electron microscope can zoom 2 billion times.

There are two types of cells, they are:- animal cells and plant cells
Difference between animal cells and plant cells
Animal cell...

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"Cells". Anti Essays. 26 Mar. 2019


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