Lab 3: Cells Flashcards
Cell membrane
Forms the boundary that separates the living cell from the external environment, it is known as a selectively permeable or semi permeable membrane
Diffusion is generally defined as
The movement of molecules from a region of high concentration to a region of low concentration until the state of equilibrium is reached
Osmosis is generally defined as
The movement of molecules through a semi permeable membrane from a region of high concentration to region of lower concentration until the state of the equilibrium is reached
An example of diffusion is
If tablesaw is dissolved in water, the salt associates in science dispersed throughout the water molecule until the uniform solution results
With diffusion what factors affect the process
The temperature, the colder equals the slower diffusion, the hotter equals the faster diffusion
Increasing temperatures
Increase his molecular activity, increase his collision of molecules in water
When starch fines iodine molecules it produces a
Dark blue colour
Iodine is a _______ in organic ________
Small, molecule
Depending on the concentration of water given to you in a question what will this determine
If you’re object in the experiment will be over filled with water or being diminished of water
Tonicity
Is a measure of the solutions ability to change the shape of cells by affecting the cells internal water volume
Isotonic
Two solutions that have the same concentration of dissolved particles and water molecules
A cell placed in isotonic solution will
Maintain its normal shape and volume
Hypotonic
A solution that contains a lesser concentration of dissolve particles in a greater concentration of water molecules
Hypertonic
A solution that contains a greater concentration of dissolved particles in a lesser concentration of water molecules than the cell
In red blood cells if the cell shrinks and loses its characteristics shape this is called
Crenation
Hemolysis
In red blood cells this is when the cell membrane ruptures in the contents of the red blood cell are released leaving only fragments of the cell behind
When you heat up a solution the_______ has been disrupted this is called ________
Protein, denaturing
And a living cell if you put it in acetone it
Gets disrupted and the phospholipids are dissolved
The living cell membrane is called a _______ because it is composed of a double layer of_______ molecules with protein molecules immersed or floating throughout the lipid portion.
Phospholipid by layer, protein
Do you know if the cell membrane is broken if
The contents come out a.k.a. the colour
If there is no change in an experiment where you’re trying to determine if something is permeable to your bag what would this mean?
That a bag is permeable to both solutions
Biuret solutions are for
Proteins
Benedick solution is searching for
Glucose or monosaccharides
