G11 Diffusion and Osmosis Lab
Name- Huda Hammam Bilal
Grade- 11E2
Total- 59 /62
95%-
Read the Introduction (first two paragraphs) from the College
... [Show More] Board Lab Manual found on p.
154 (PDF doc) or p. S51.
https://apcentral.collegeboard.org/pdf/ap-biology-teacher-lab-manual-effective-fall-2019.pdf?
course=ap-biology
Rate of Diffusion
A Review of Osmosis [9]
Channels Proteins Phospholipids Passive Osmosis ATP
Selectively
permeable
Pumps Isotonic Hypotonic Hypertonic
The plasma membrane is selectively permeable since only certain molecules pass
freely through. The membrane is composed of a double layer of special detergents called
phospholipids. Embedded between these lipids are larger pumps that can be involved in cell
transport as well by acting as channels or proteins. Water moves freely through the cell
membrane through a process called Osmosis. This is a type of passive transport because it
requires no ATP on the part of the cell.
Solute concentration affects the rate and direction of water movement through a cell
membrane. There are three terms used to describe the solute concentration in a solution. These
include Isotonic, Hypotonic, and Hypertonic. Label the diagrams below with these terms.
Label the following solutions as hypotonic, hypertonic, or isotonic. [3]
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Cell A Cell B Cell C
Extracellular Fluid Intracellular Fluid Extracellular Fluid
** Why does water flow from a hypotonic solution to a hypertonic solution? [2]
Water flow from a hypotonic solution to a hypertonic solution because it must go from low
concentration to high concentration until a certain point to maintain a balanced concentration
of salt.
Diffusion and osmosis virtual lab
Overview: In this virtual investigation, students will observe the effects of temperature and
molecular size on rate of diffusion and the effects of osmosis on a model. They will graph data
and utilize the data to determine the osmotic potential of the cell. [Show Less]