​Diffusion describes the tendency of materials (solutes in particular) to want to move from areas of high concentration to areas of low concentration.

The cell membrane is made of two layers of lipids. On each lipid molecule, there is a part of the molecule that repels water (hydrophobic) and a part that does not repel water (hydrophilic). The only way the lipid molecules could arrange themselves along the border between the inside of the cell (where there is water) and the outside of the cell (where there is also water) is to line up in two layers, back-to-back. The hydrophilic sides of molecules face the water in or out of the cell, while the hydrophobic portions are protected within.

In this activity, candy corn modeled the lipid molecules where the yellow part is hydrophilic and the orange/white portion is hydrophobic.
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Unit 3: Life, Cells, & Energy

 (TBA)​For starters, here is the study guide:

• Quizlet Study Guide - Characteristics of Life, Cells, Eukaryotic Cell Parts, & Microscopes

​Here is a screen-shot of the in-class review:

Here are the online lessons:

• ​Chapter 1-3 Studying Life
• Chapter 7-1 Life is Cellular
• ​Chapter 7-2 Eukaryotic Cell Structure

Don't forget your notes:

• Chapter 1-3 Studying Life
• Chapter 7-1 Life is Cellular
• ​Chapter 7-2 Eukaryotic Cell Structure

Here are copies of notes provided by your peers:

• Chapter 1-3 Studying Life
• Chapter 7-1 Life is Cellular
• Chapter 7-2 Eukaryotic Cell Structure

Here are previous blog entries:

• #BioDub Is R2D2 Living?
• #BioDub Click the Pic - How Small is a Cell?

Use the Microscope Practice Worksheet HERE

Play the Kahoot! HERE

Unit 3: Life, Cells, & Energy

​The role of the cell membrane is to regulate (control) what enters and leaves the cell, allowing some materials in/out while preventing other materials from doing so. In a similar way, a screen window allows certain things to enter/leave the home, yet prevents others from doing so.

​The cell membrane prevents certain materials from entering the home or leaving the cell, just like a screen window prevents certain things from entering the home or leaving the home.

​A cell membrane allows some materials to either move into the cell or out of the cell, much like a screen window which allows some things into a home or out of the home.

​Try these videos too...

​​No :'(

​For starters, here is the study guide:

• Quizlet Study Guide - Chemical Reactions & Enzymes (Chapters 2-4)

​Here is a screen-shot of the in-class review (TBA):

Here is the online lesson:

• ​Chapter 2-4 Chemical Reactions & Enzymes

Don't forget your notes:

• Chapter 2-4 Chemical Reactions & Enzymes

Here are copies of notes provided by your peers:​

• Chapter 2-4 Chemical Reactions & Enzymes

Here are previous blog entries:

• #BioDub Enzyme Videos Enzymes
• #BioDub My GIFs to You - Enzyme Reactions
• ​#BioDub Enzyme/Substrate : Wrench/Nut & Bolt Analogy

Unit 2: Chemistry of Life

​Enzymes bind to specific substrates. The substrate fits into the enzyme at a location on the enzyme called the active site.