Exploring the Cell Membrane_Ford

Open Ended

Science Spot: What is the importance of the cell membrane? Name at least 3 key functions of the cell membrane (be specific).

(Ex: Three functions of the cell membrane are: ______, _____, and ______)

Rewind

• We started learning about biomolecules which build up to make...

• Cell Complexity (which we explored by doing the Cell Type Virtual Lab)

• Organelles compose cells

• The types and distribution of these organelles determine the types of cells...

• Let's do a quick review

Categorize

Options (13)

Bacteria

Plant Cell

Animal Cell

Cytoplasm

Ribosomes

Genetic Material (DNA)

Nucleus

Mitochondria

Chloroplast

DNA in cytoplasm

First Cell

Cell membrane

Cell Wall

Organize these options into the right categories

Prokaryotic

Eukaryotic

Both

More complicated...

Why do you think prokaryotic cells arrived first? How do you think eukaryotic cells came about?

(Talk to your partner for 1 minute and then respond to the next slide)

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Prokaryotic Vs Eukaryotic

Open Ended

Why do you think prokaryotic cells arrived first? How do you think eukaryotic cells came about?

This engulfment allowed for the complex cells we see today

How was the cell able to advance like this? Which organelle played a crucial role in allowing it to happen?

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Endosymbiotic Theory

Review this information from the project you all did on Friday/Monday

Notice

​That they are the same things we have talked about since the beginning of biology

Exploring the Cell Membrane

Understanding the structure and function of the cell membrane, a vital component of all living cells. Discover the lipid bilayer, membrane proteins, and their roles in cellular transport and cell signaling. Explore the fascinating world of the cell membrane!

Introduction to the Cell Membrane

• The cell membrane is a semipermeable barrier that surrounds the cell.
• It controls the movement of substances in and out of the cell.
• The membrane is composed of a phospholipid bilayer with embedded proteins.
• It also contains cholesterol, carbohydrates, and other molecules.
• The cell membrane plays a crucial role in maintaining cell homeostasis.

Multiple Choice

What is the main function of the cell membrane?

• To control the movement of substances in and out of the cell

• To provide structure and support to the cell

• To produce energy for the cell

• To store genetic information

Cell Membrane:

To control the movement of substances in and out of the cell. The cell membrane acts as a gatekeeper, allowing essential nutrients to enter and waste products to exit. It is selectively permeable, regulating the flow of molecules. This crucial function ensures the cell's survival and proper functioning.

Cell Membrane Structure

• The cell membrane is composed of a phospholipid bilayer.

• It consists of hydrophilic heads and hydrophobic tails.

• Proteins are embedded in the membrane, serving various functions.

• Cholesterol molecules provide stability to the membrane.

• Cholesterol also helps identify cells and cell locations (like a nametag)

• Membrane proteins can be integral or peripheral.

Each part of this cell membrane plays a key role in maintaining homeostasis for the cell

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Recognize this beauty?

Multiple Select

What is the function of cholesterol molecules in the cell membrane?

• To provide stability to the membrane

• To serve as hydrophilic heads

• To serve as hydrophobic tails

• To embed proteins in the membrane

• Allow for cell to cell recognition between cells and environment

Cholesterol: Stability Provider

Trivia: Cholesterol molecules play a crucial role in maintaining the stability of the cell membrane. They act as stability providers by preventing the fatty acid chains of phospholipids from packing too closely together. This helps maintain the fluidity and integrity of the membrane. Cholesterol is like a bodyguard for the cell membrane!

Functions of the Cell Membrane

• Boundary: Separates cell from external environment
• Transport: Controls movement of substances in and out of the cell
• Cell Recognition: Identifies self from non-self cells
• Cell Signaling: Receives and transmits signals to coordinate cell activities
• Structural Support: Maintains cell shape and provides mechanical support

Cell Membrane:

• Homeostasis: Maintaining a stable internal environment
• Functions: Selective permeability, cell signaling, protection
• Structure: Phospholipid bilayer with embedded proteins
• Transport: Passive (diffusion, osmosis) and active (protein pumps, endocytosis)

Multiple Choice

Which function of the cell membrane relates to the lab over osmosis that you explored yesterday?

• Boundary

• Transport

• Cell Recognition

• Structural Support

Multiple Choice

What are the functions of the cell membrane?

• Selective permeability, cell signaling, protection

• Diffusion, osmosis, protein pumps

• Phospholipid bilayer, embedded proteins, endocytosis

• Homeostasis, passive transport, active transport

Factors Affecting Transport

• Concentration Gradient: Determines the direction of movement across the membrane.
• Molecular Size: Smaller molecules pass through more easily.
• Lipid Solubility: Lipid-soluble substances diffuse through the membrane.
• Charge: Charged molecules require transport proteins.
• Temperature: Higher temperatures increase the rate of diffusion.

Multiple Choice

Which factor determines the direction of movement across the cell membrane?

• Concentration Gradient

• Molecular Size

• Lipid Solubility

• Charge

Draw

Draw an arrow to where you think water will move (either an arrow into the cell, an arrow out of the cell, or an equal sign to show it moves into and out of the cell at the same rate)

Draw

Draw an arrow to where you think water will move (either an arrow into the cell, an arrow out of the cell, or an equal sign to show it moves into and out of the cell at the same rate)

This largely deals with OSMOSIS (or the movement of water to achieve homeostasis)

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Types of Solutions

Open Ended

You should be able to answer this with more detail now. Science Spot: What is the importance of the cell membrane? Name at least 3 key functions of the cell membrane (be specific).

(Ex: Three functions of the cell membrane are: ______, _____, and ______)