Cell Membrane Transport Mechanisms

The video tutorial by Dr. Morton covers the basics of membrane transport, including the permeability of the cell membrane, types of diffusion, osmosis, and active transport mechanisms. It explains how different molecules and ions move across the cell membrane, the role of transport proteins, and the importance of concentration gradients in cellular physiology.

What is the primary role of the cell membrane in terms of ion concentration?

• To maintain a higher concentration of sodium ions inside the cell

• To maintain a higher concentration of sodium ions outside the cell

• To maintain a higher concentration of potassium ions outside the cell

• To equalize ion concentration inside and outside the cell

Which type of molecules can easily diffuse through the cell membrane?

• Large polar molecules

• Small nonpolar molecules

• Proteins

• Charged ions

What is the main difference between simple diffusion and facilitated diffusion?

• Simple diffusion requires energy, facilitated diffusion does not

• Facilitated diffusion requires a membrane protein, simple diffusion does not

• Simple diffusion moves particles against their concentration gradient

• Facilitated diffusion is slower than simple diffusion

Which type of channel opens in response to a change in membrane potential?

• Ion leak channels

• Carrier proteins

• Ligand-gated channels

• Voltage-gated channels

What triggers the opening of a ligand-gated channel?

• A change in pH

• The presence of a specific ion

• A change in temperature

• The binding of a chemical messenger

In osmosis, water moves towards which side of the membrane?

• The side with higher solute concentration

• The side with lower solute concentration

• The side with higher water concentration

• The side with equal solute concentration

What is required for primary active transport to occur?

• A voltage change

• ATP

• A ligand

• A concentration gradient

In secondary active transport, what is the role of the particle moving down its concentration gradient?

• It requires ATP to move

• It moves in the opposite direction of the other particle

• It moves faster than the other particle

• It provides energy for another particle to move against its gradient

What is a symporter?

• A protein that requires ATP to function

• A protein that moves two particles in the same direction

• A protein that only moves ions

• A protein that moves two particles in opposite directions

Which of the following is an example of an antiporter?

• Sodium-glucose transporter

• Sodium-calcium exchanger

• Sodium-potassium pump

• Glucose transporter