Bio Lab 3 Cell Membranes Lab Report
A completed lab report analyzing cell membrane structures and their functions in biological systems.
Eli Simmons
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BioLab3
Cell Membranes
Lab Report
I. Diffusion
Define the following terms.
Solvent Any substance capable of dissolving or dispersing another substance.
Solute Any substance dispersed by water.
Solution. Taken together, the solvent and the dissolved solute.
Diffusion The movement of dissolved molecules from an area of higher
concentration to lower concentration.
Concentration
gradient
Is present when there is a difference in the amount of like molecules
in two regions.
Dynamic
equilibrium
When the solvent and solute molecules become equally distributed
and the gradient comes to exist.
EXERCISE 1 – Factors influencing rate of diffusion
• Predict how molecule size and temperature will affect the outcome of this experiment.
Molecule size will either increase or decrease diffusion based on the temperature.
Record the data from the information in the lab.
Potassium Permanganate R.T. Methylene Blue R.T.
Time
(min)
Total
Diameter
(mm)
Distance of
Diffusion *
(mm)
Rate (mm/min) * Total
Diameter
(mm)
Distance of
Diffusion *
(mm)
Rate (mm/min) *
0 8mm 0mm 0 mm/min 7mm 0mm 0 mm/min
15 14mm 6mm .43 mm/min 9mm 2mm .13 mm/min
30 18mm 10mm .33 mm/min 10mm 3mm .1 mm/min
45 20mm 12mm .27 mm/min 10mm 3mm .07 mm/min
Potassium Permanganate 5 Celsius Methylene Blue 5 Celsius
Time
(min)
Total
Diameter
Distance of
Diffusion *
Rate (mm/min) * Total
Diameter
Distance of
Diffusion *
Rate (mm/min) *
BioLab3
Cell Membranes
Lab Report
I. Diffusion
Define the following terms.
Solvent Any substance capable of dissolving or dispersing another substance.
Solute Any substance dispersed by water.
Solution. Taken together, the solvent and the dissolved solute.
Diffusion The movement of dissolved molecules from an area of higher
concentration to lower concentration.
Concentration
gradient
Is present when there is a difference in the amount of like molecules
in two regions.
Dynamic
equilibrium
When the solvent and solute molecules become equally distributed
and the gradient comes to exist.
EXERCISE 1 – Factors influencing rate of diffusion
• Predict how molecule size and temperature will affect the outcome of this experiment.
Molecule size will either increase or decrease diffusion based on the temperature.
Record the data from the information in the lab.
Potassium Permanganate R.T. Methylene Blue R.T.
Time
(min)
Total
Diameter
(mm)
Distance of
Diffusion *
(mm)
Rate (mm/min) * Total
Diameter
(mm)
Distance of
Diffusion *
(mm)
Rate (mm/min) *
0 8mm 0mm 0 mm/min 7mm 0mm 0 mm/min
15 14mm 6mm .43 mm/min 9mm 2mm .13 mm/min
30 18mm 10mm .33 mm/min 10mm 3mm .1 mm/min
45 20mm 12mm .27 mm/min 10mm 3mm .07 mm/min
Potassium Permanganate 5 Celsius Methylene Blue 5 Celsius
Time
(min)
Total
Diameter
Distance of
Diffusion *
Rate (mm/min) * Total
Diameter
Distance of
Diffusion *
Rate (mm/min) *
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Subject
Biology