Cell Membrane and Transport Mechanisms

What is the structure of the cell membrane?

What maintains homeostasis in cells?

What are the primary functions of the cell membrane? (Select all that apply)

The cell membrane is a completely permeable barrier.

What type of transport moves substances with the concentration gradient?

Which type of transport requires energy?

Which transporter is associated with Glut 1 deficiency syndrome?

What do GLUT2 transporters primarily transport?

Cell Membrane

The cell membrane is a lipid bilayer, which acts as a barrier for the cell.
The membrane is made up of phosphoglycerides, sphingolipids, and cholesterol.
Cholesterol makes the membrane less fluid in some regions.
The cell membrane is involved in compartmentalization, providing a scaffold for biochemical activities and exchanging contents with the environment.

Transport Across the Membrane

The cell membrane is relatively impermeable to polar molecules.
Passive Transport: This process does not require energy.
- Simple diffusion: Molecules move across the membrane with the concentration gradient.
- Facilitated diffusion: Molecules move across the membrane with the help of transport proteins.
Active Transport: This process does require energy.
- Molecules move against the concentration gradient.
- Examples of active transport include Ca2+ transporters and CFTR.
Membrane Transport Proteins: These proteins are responsible for transporting molecules across the cell membrane, either actively or passively.

Glut 1 deficiency syndrome: This occurs due to a deficiency in the GLUT1 transporter.
Fanconi Bickel Syndrome: This is caused by a deficiency in the GLUT2 transporter.

Explore the structure and function of the cell membrane with this quiz. Dive into the details of passive and active transport processes, including simple diffusion and the role of membrane proteins. Test your understanding of lipid bilayers and their significance in cellular activities.