Date: November 14, 2016 Aim #24: How does the structure of the cell membrane contribute to its function? HW: Daily Review of class notes. Castle Learning.

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Date: November 14, 2016 Aim #24: How does the structure of the cell membrane contribute to its function? HW: Daily Review of class notes. Castle Learning GRADED QUIZ due Thursday by 10:30PM Unit 3 Test Tuesday 11/22 (period 5) Wednesday 11/23 (period 1) Do Now: Please take out the worksheet from yesterday 

Aim #24: How does the structure of the cell membrane contribute to its function?

1) What is the function of the structure below? CELL MEMBRANE Its function is to CONTROL what enters and exits the cell.

2) What is the cell membrane made up of? Phospholipids Proteins

3) What is a phospholipid? The cell membrane is composed of a special type of lipid (fat) called a phospholipid. PHOSPHOLIPID BI-LAYER This part of the phospholipid is afraid of water and tries to avoid it.

phospholipids

4) What are types of proteins in the cell membrane? Membrane Proteins: Structural Proteins: Transport Proteins: (Channels) Receptor Proteins Enzymes STRUCTURAL PROTEIN CHANNEL

5) What are receptors? RECEPTORS Receptors found on the cell surface aid in cell to cell communication. Messengers (hormones) from other cells bind to these receptors (based on shape) and transfer information.

Receptors on cell membrane are involved in cell communication Cell receptor (receptor molecule) Signal 1 is released from cell B and sent to cell A Signal 2 is released by cell A and sent to cell B

How is the cell membrane different from an umbrella? An umbrella is impermeable It does not allow materials through

How is an umbrella different from a window screen? The window screen is permeable It allows materials through

6) How is a window screen similar to the cell membrane? The cell membrane is permeable-it allows materials through

7) Do all things get through the cell membrane? NO! 8) The cell membrane is SELECTIVELY PERMEABLE because it allows certain substances through and prevents other substances from passing.

What is the difference between these molecules?

Can the elephant get into the house?

Why do some things get through the cell membrane? Small molecules are more likely to get through the cell membrane compared to big molecules

9) What will get through the cell membrane? Water Glucose CO2 O2 And other small molecules

Protein lipid Lipid: hydrophobic tail Lipid: hydrophilic head

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