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C1) Cell Theory&SA:V

The cell is the unit of structure and function in most organisms.

QuestionAnswer
What is the cell theory? Cells are the basic unit of life. All living organisms are composed of cells. They may be unicellular or multicellular. Cells arise from pre-existing cells.
How many times can light microscopes magnify? Up to 1500
How do light microscopes work? By relying on the light passing through a very thin section of tissue.
What are the components of a light microscope? Light is focussed through a series of lenses. The lens near the eye called the eyepiece lens and the one near the object is called the objective lens.
What special objective lens might a light microscope have? An oil immersion lens between the lens and the object that enables maximum magnification.
How many times can electron microscopes magnify? About 100,000
How do electron microscopes work? By relying on beams of electrons passing through a vacuum and then through a thin layer of tissue.
What is a Transmission Electron Microscope? Electrons are transmitted to provide great detail of cellular structures.
What is a Scanning Electron Microscope? The object is scanned to give a 3D effect.
What are cells measured in? Micrometres (μm)
What are structures in cells measured in? Nanometres (nm)
How many nanometres in 1 micrometre? 1000
What are the smallest cells? Bacterium
What are larger cells? Mesophyll cells in plants
Why is a larger surface area to volume ratio better? Cells are able to obtain their nutrients an dispose of wastes more efficiently.
Created by: MahaliaMcD
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