microscope & cell membrane Flashcards
active transport
molecules moving into cell
which form of transport requires ATP energy
active transport
passive transport
molecules moving out of cell
cell membranes are composed of
protein channels, lipids, and protein receptors
purpose of the membrane
protect inside of cell
chemicals are able to bind to cell receptors because..
of their specific shape
osmosis
solution with a high concentration diffuses into another solution with a low concentration to balance the molecules
hypotonic
low concentration, water moves into cell
hypertonic
higher concentration, water moving out of cell
when too much water moves into a cell
it can burst
when not enough water is in the cell
it will shrink
selectively permeable
cell membrane selects what is allowed into cell
diffusion
high concentration of liquid moving to a lower concentration because of diluted water added to cell
atp
energy molecules produced in mitochondria
allowed into cell membrane
h20, glucose, 02 and c02
not allowed into cell membrane
lipids, starch, and proteins
how can a microscope slide viewed on high power be damaged
increasing the coarse adjustment knob
what will happen if you increase magnification and the subject is not centered
you will not be able to see it completely, it will be off view
increasing the magnification of the microscope will do what to the subject view
it will limit your field of view across the entire subject, but you will be able to see it in more detail
decreasing the magnification of the microscope will do what to the subject view
will let you see the entire subject, but you won’t be able to see as much close-up detail
how to find total magnification
multiply eyepiece by the objective lens
10x eyepiece, 40x objective lens = 400x total magnification
how to perform wet mount slide
place subject on slide, drop water on slide, then add cover slip
how to add stain/salt water
place a paper towel on one side of the coverslip and use a dropper to place stain/salt water on the other side of coverslip
what does the coarse focus knob do
moves stage up and down quickly
what does fine focus knob do
used to make small focus adjustment especially when using high power objective lens
purpose of stage
holds the slide and allows light to pass through and make the subject more clear
purpose of diaphragm
controls the amount of light going into the subject view
after switching from the high power to low poer objective lens of a compounds light microscope,
the area of the low power field will appear larger and brighter
