cell structure
- Created by: marissajade78
- Created on: 04-03-20 17:33
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- cell structure
- microscope
- eyepiece is to magnify specimen
- magnification is the level of detail
- Magnification of the microscope = magnification of eyepiece × magnification of objective
- magnification= size of image x size of actual image
- Antonie van Leeuwenhoek was the first person to invent a microscope
- in the 1800 the optical lens had increased and is similar to the ones we use today
- the magnification of a microscope is x1500
- electron microscopes are used by beaming electrons of light
- There are two different types, scanning electron microscope (SEM) or a transmitting electron microscope (TEM)
- SEM has a low magnification and has a large field space. TEM has a high magnification and is used to examine thin cells or tissues
- cell size
- The best unit to measure most cells is the micrometre, symbol ?m.
- for sub-cellular cells is best to use a smaller units, nanometers symbol nm
- standard form= a x 10 to the power of something ( a is always smaller than 10 and is a decimal number)
- standard from (smaller microorganisms) a x 10 minus to the power of something (a is always a whole number)
- biological samples for examination
- when testing plant cells
- place water. peel skin of onion. place onion in water and then place iodine.
- when testing animal cells
- place water . swab mouth with cotton bud. place cotton bud on water
- when testing other biological cells
- grab glycerol. get piece of hair. place hair on glycerol. layer with a thin glass (cover slip) then add a drop of stain. use a sheet of filter paper to drag out the stain.
- cover slips are used to prevent drying out and to protect microscope
- mounted needles are used to help hold down coverslip
- when testing plant cells
- Animal cells
- microscope
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