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Biological world 1: cells Biological world 2: reproduction and genetics…
Biological world 1: cells Biological world 2: reproduction and genetics
parts of a cell
Cell membrane
Controls what enters and leaves the cell
Cytoplasm
A watery liquid which supports smaller structures in the cell
Nucleus
contains chromosomes and controls the cell
EXTRA parts of a Plant cell
plants ALSO have three MORE parts to their cels
Chloroplasts
makes food for the cell
Vacuole
contains a liquid which pushes outwards making the cell strong
Cell wall
made from cellulose which pushes outwards making the cell strong.
Microscopes
how to see cells
Cells must be thin enough to allow light to pass through them
a stain is used to make cells easier to see
Methylene blue is used to stain cheek cells
Iodine is used to stain onion cells
microscopes are used to make cells look bigger
A cover slip holds the cells in place on the microscope slide and keeps them wet
to use microscope, place the slide on the stage, start with lower power lens and look through eye piece. turn on lamp and adjust focus knob to see clear image.
Parts of a Microscope
stage controls
coarse focus
mechanical stage
fine focus
objective lenses
Iluminator
arm
Variable intensity control
eyepeice
Diaphram
