Wednesday -Thursday 20- 21st - Study Guide and Comparing Active and Passive Transport

Today we made a comparison between active and passive transport using a Double Bubble graphic organizer.

Here are some pictures of the carousel activity that we completed Wednesday.

Here is a link to the the online BBC Webquest.  I emailed this to your school accounts as well in a Pages format so you can type right into it.

Here is the Cell Transport Study Guide for Friday's Quiz.

Here is a final BBC Video that is very good on osmosis and diffusion.

Here are a few good review question on plant cell osmosis.

Here is a great visual of the effect of osmosis and blood cells.

Here is a look into today's review session using a cafe style review technique.

Egg Osmosis Lab

Here is the link to the Egg Osmosis Lab if you want to attempt it.
Download the directions here.

Active Transport - March 18th 2013

Today we were introduced to the second form of cell transport, active transport.
Active transport is when energy is needed to be used to move molecules from low concentration to high concentration across a cell membrane.  Often in this form of transport, transport proteins are used to aid the process.

Here is an image of active transport.

Here is a link comparing of active and passive transport.

Here is a video showing active transport in terms of the sodium/ potassium pump.

March 14th - Onion Cell Osmosis Lab

Here is the lab we completed today looking at osmosis and red onion cells.
Click here to access lab.

Background:

A substance that dissolves in another substance is called a solute, and the more plentiful substance that does the dissolving is called the solvent.  In living things, water is the solvent.  The mixture of solute and solvent is called a solution. Solute and solvent tend to diffuse from areas where their concentration is high to areas where their concentration is lower.  When water moves from higher concentration of water to lower concentration of water through a cell membrane, it is called osmosis. 

Here is the cell before the salt solution was added.

Here is the cell after the salt solution was added.

Notice the decrease in size of the vacuole as the water is diffused out of it.

March 12th - Diffusion Lab

Today we completed a lab on diffusion.

The essential question was - How do cells move molecules in and out of their membranes?

Here is the Introduction of the lab:

In this lab you will observe the diffusion of a substance across a semi-permeable membrane. We will model cell membranes using a plastic bag and explore movement of molecules when we change the concentration of substances.  Iodine is a known indicator for starch. An indicator is a substance that changes color in the presence of the substance it indicates. 

Here is a link to the lab.

Here are some photos of the before and after.  The iodine diffused through the bag and reacted with the starch turning it purple!

Students need to complete the post-lab for homework.

Monday March 11th - Cell Transport

Today we will be starting a Unit on Cell Transport (active and passive).

Here are the notes from today's class.  Click here to access.
Today in class we will add to these notes filling in examples of each of the vocabulary terms from demonstrations performed in class.


Here are some interactive links showing diffusion of molecules - a form of passive transport.

Wisc-Online - The Cell Passive Transport Demo

Northland College - Passive Transport Demo