Membrane Structure and Function POGIL, Summaries of Cell Biology

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Membrane Structure

and Function POGIL

Tuesday, December 2, 2014

Welcome! 12/2/

• OBJECTIVE: Students will participate in a POGIL

assignment to investigate the structure and function of

cell membranes.

• CATALYST: (REVIEW)

1. What is the function of the cell membrane?

2. What is the structure of the cell membrane?

3. What analogy did we make for the cell membrane?

• HOMEWORK:
  • HW 3.2 DUE Friday, 12/5/
  • Quiz 3.2 Friday, 12/5/
  • Chapter 1 (Survival of the Sickest) DUE Monday, 12/8/

Where are we going?

• Homeostasis in cell membranes
• Passive/Active Transport
• Osmosis
• Diffusion

Review Cell Membranes

1. What is the function of the cell membrane?

2. What is the structure of the cell membrane?

3. What analogy did we make for the cell membrane?

POGIL Investigation

POGIL

• What is a POGIL?
• Process Oriented Guided Inquiry

Learning

• The focus is on HOW you are

gathering information

POGIL Roles

• Let’s summarize what we feel are the most important parts of each role: - Facilitator - Spokesperson - Quality Control - Process Analyst

POGIL Guidelines

• Everyone should be participating and recording answers
• YOU are responsible for YOUR role!!!
• I will be checking that you are performing your role. THIS is

what influences your final grade as a group. TEAMWORK!!

• When you get to a stop sign, make sure your team has all of

the answers for each question and that they are consistent

(NOT IDENTICAL). The spokesperson should raise their hand

for me to check answers. I WILL CHOOSE the paper to check.

• I will give you some guidance with how much time you

should need to complete each section.

• STAY ON TASK! 

Review

Review Questions:

1. What is the function of the cell membrane in a cell?
2. What macromolecule makes up a cell membrane?
3. What is “homeostasis”?
4. Why is homeostasis important?

Cell Membranes

• Made of lipid bilayer
  • “bi” = “two”
• Hydrophobic—
  • “hydro” =
  • “phobia” =
• Hydrophilic—
  • “hydro” =
  • “phil” =

Lipid Bilayer

Glycerol Head Fatty Acid Chains

Cell Membranes…

• Contain
  • Transport Proteins
  • Receptor Proteins
  • Carbohydrates
  • Cholesterols
• Are semi-permeable or selectively permeable

Selectively Permeable

• Membrane chooses what can come in and go out of the cell
• Whether something will pass through the membrane is determined by: - Size - Charge - Concentration

Selectively Permeable

Look at the chart on the right.

• What molecules will pass through the membrane easily?
• What molecules will not pass through easily?