high tower ❤️

Chapter 1: Introduction

  • Teacher wants to improve osmosis lab

  • Colleague suggests using eggs soaked in vinegar

  • Shell comes off, leaving membrane to mimic cell membrane

Chapter 2: Membrane Of Cell

  • Cell membrane is semi-permeable

  • Membrane of a cell is visualized as the membrane around a chicken egg

  • Surface area is important for cell membrane function

Chapter 3: Amazing Cell Membrane

  • Cells are smaller than chicken egg to maintain high surface area to volume ratio

  • Cell membrane structure is important for all living things

  • Fluid mosaic model describes the cell membrane

Chapter 4: The Polar Head

  • Cell membrane consists of a phospholipid bilayer

  • Phospholipid has polar head and non-polar tail

  • Polar head is hydrophilic, non-polar tail is hydrophobic

  • Phospholipids arrange into bilayer with non-polar areas in between

Chapter 5: The Whole Cell

  • Phospholipids in the cell membrane move around, giving it flexibility

    • Phospholipids can flip flop around, but it's less common

  • The phospholipid bilayer borders the whole cell

  • Cholesterol in the cell membrane is critical

    • Cholesterol acts as spacers between phospholipids in low temperatures

    • Cholesterol connects phospholipids to prevent excessive fluidity in warm temperatures

  • Proteins play important roles in the cell membrane

    • Proteins are involved in protein synthesis

Chapter 6: Area Of Membrane

  • Many proteins are found in or on the cell membrane

    • Peripheral proteins are on the exterior areas of the membrane and do not go through it

    • Integral proteins go through the membrane

      • Integral proteins are involved in transporting materials

    • Peripheral proteins have various functions

      • Act as enzymes to speed up reactions

      • Attach to cytoskeleton structures to help with cell shape

    • Both protein types can have carbohydrates bound to them, making them glycoproteins

  • Glucose molecules cannot enter cells through the phospholipid bilayer

    • Integral proteins are needed to transport glucose into cells

Chapter 7: Conclusion

  • Glycoproteins and glycolipids play important roles in cell recognition and signaling

    • Glycoproteins and glycolipids identify the cell as belonging to the organism

    • They are involved in self and non-self recognition

    • They can be involved in cell signaling

  • CD4 glycoprotein is found on the surface of immune cells

    • CD4 glycoprotein is essential for immune system cells to interact with each other

    • HIV virus exploits the CD4 glycoprotein to infect helper T cells

  • Understanding cell membrane components is critical in fighting viral and bacterial diseases

Fluid Mosaic Model

describes the structure of the plasma membrane as a mosaic of components —including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character

Lipid Bilayer

a biological membrane consisting of two layers of lipid molecules. Each lipid molecule, or phospholipid, contains a hydrophilic head and a hydrophobic tail. The tail regions, being repelled by water and slightly attracted to each other, congregate together.

Membrane proteins

1. Integral:

reside within the bilayer membranes that surround cells and organelles, playing critical roles in movement of molecules across them and the transduction of energy and signals.

2. Periphiral:

transportating to various locations in the cell, signaling, and maintaining the cell shape and structure.

Cholesterol:

a waxy, fat-like substance that your body needs for good health, but in the right amounts.

Carbohydrate Chains:

attached to various proteins and lipids and modify their functions.

1.What are the primary components of the cell membrane's lipid bilayer?

- There are three major classes of membrane lipid molecules—phospholipids, cholesterol, and glycolipids.

2. How do integral and periphiral proteins differ in their roles within the cell membrane?

- Integral membrane proteins are permanently in the cell membrane, while peripheral membrane proteins attach and detach from the cell membrane at different times.

3. What is the significance of cholesterol in the cell membranes structure?

- Cholesterol plays a role in maintaining the structural integrity and regulating the fluidity of cell membranes [17–20], therefore contributing to the homeodynamics of various membrane proteins on the cell surface.

4. How do carbohydrate chains on the cell membrane contribute to cell function?

- Carbohydrate chains helps cells recognize each other and providing protection for cells.