Key Terms Flashcards
Resolution
The smallest change in the quantity being measured that can be detected by an instrument.
Uncertainty
Half of the resolution. Eg; +/- 0.5 ml
Precision
How small the units of measure cents are. For example the number of decimal places any measurement can be recorded is determined by the apparatus used. A pipette has a greater precision than a beaker.
Accuracy
This depends on your equipment. This is often written as:
X(ml) +/- Uncertainty
% Error
Uncertainty
__________ x 100 = 5 error
Total volume
Resolution
Is the ability to see individual objects as separate entities.
Magnification
Is how many times larger the image is than the actual size of the object being viewed.
Magnification formula
size of image
magnification____________________
actual size of object
M.R.S G.R.E.N
Movement Respiration Sensitivity Growth Reproduction Excretion Nutrition
The 3 points in Cell Theory
1) All living things consist of cells
2) New cells are formed only by the devision of pre-existing cells.
3) The cell contains information that acts as the instructions for growth. This info can be passed on to new cells
What is meant by staining?
Staining is adding a dye to increase the contrast as different components within a cell take up stains to different degrees. This allows the components in the ultrastructure to become visible to be identified.
Polar
Unequal charge so it has electrical poles. Hydrophilic
Non-polar
Equal charge no electrical poles present. Hydrophobic
Hydrophilic
Likes water
Hydrophobic
Doesn’t like water
