ASSIGNMENT ON CELL STRUCTURE PT 1

Which one of the following cell structures can be seen with a light microscope?

• mitochondrion

• ribosome

• rough ER

• smooth ER

The use of electrons as a source of radiation in the electron microscope allows high resolution to be achieved because electrons:

• are negatively charged.

• can be focused using electromagnets.

• have a very short wavelength.

• travel at the speed of light.

Which one of the following structures is found in animal cells, but not in plant cells?

• cell surface membrane

• centriole

• chloroplast

• Golgi body

Copy and complete the following table, which compares light microscopes with electron microscopes. Some boxes have been filled in for you.

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List 5 structures found in an electron micrograph of an animal cell which would be absent from the cell of a bacterium

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Distinguish between magnification and resolution

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Answer explanation

magnification is the number of times larger an image is compared with the real size of the object.
resolution is the ability to distinguish between two separate points.

Distinguish between light microscope and electron microscope

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Answer explanation

light microscope uses light as a source of radiation. electron microscope uses electrons as a source of radiation.