Cells And Microscopy Flashcards
(17 cards)
What are the basic units of life?
Cells
All living things are made of cells, and all cells come from other cells.
What is the purpose of microscopes?
To magnify images for clearer viewing of cells and their structures
Microscopes make it easier to see cells and their structures.
What is the formula for calculating total magnification?
Total magnification = magnification of eyepiece lens x magnification of objective lens
Magnification is an important property of microscopes.
What is the typical magnification of the eyepiece lens?
X10
What is the greatest total magnification usually achievable with a light microscope?
X1000
What is required for a specimen to be viewed under a microscope?
Specimen needs to be thin
Light or an electron beam must pass through it.
What is the purpose of a coverslip in microscopy?
To protect the specimen and the lens
A coverslip is necessary if the specimen and lens should touch.
What is the role of stains in microscopy?
To distinguish different features in the specimen
What type of microscope has a far greater magnification?
Electron microscopes
What is a limitation of electron microscopes?
Can only examine dead material
What is the size of the real object if the size of the image is 20mm and the magnification is 16000?
0.00125 mm
Convert 1 μm to mm.
0.001 mm
If a structure is viewed under a light microscope with a magnification of x400 and measures 7 divisions on a scale where each division equals 0.06 mm, what is the real length of the structure?
Real length = 7 x 0.06 mm = 0.42 mm
True or False: Light microscopes can be used to view living cells.
True
What type of image does a light microscope produce?
Light micrograph
What is the function of the stage in a microscope?
To support the specimen
What type of image does an electron microscope produce?
Electron micrograph
