Membrane Transport Mechanisms in AP Biology

This video covers membrane transport, focusing on AP Biology curriculum topics. It explains passive transport, including simple and facilitated diffusion, and active transport, highlighting the role of ATP. The video also discusses the processes of endocytosis and exocytosis, using examples like the sodium-potassium pump and neuron action potentials to illustrate these concepts.

What are the two main types of membrane transport discussed in the video?

• Passive and active transport

• Endocytosis and exocytosis

• Facilitated and simple diffusion

• Osmosis and diffusion

Which type of molecules can passively cross the phospholipid bilayer?

• Ions

• Large molecules

• Polar molecules

• Nonpolar molecules

What is the main driving force behind simple diffusion?

• Protein channels

• Concentration gradient

• Random collisions of molecules

• ATP consumption

Which of the following is an example of facilitated diffusion?

• Water moving through aquaporins

• Glucose entering a cell through a protein channel

• Carbon dioxide leaving a cell

• Oxygen entering a cell

What is the role of protein channels in facilitated diffusion?

• They help nonpolar molecules cross the membrane

• They create a concentration gradient

• They use ATP to move molecules

• They assist ions and large molecules in crossing the membrane

What triggers the opening of voltage-gated ion channels in neurons?

• Presence of specific ions

• Concentration gradient

• Change in membrane potential

• ATP binding

During an action potential, which ions flow into the neuron first?

• Sodium ions

• Chloride ions

• Potassium ions

• Calcium ions

What is the main function of the sodium-potassium pump?

• To generate ATP

• To facilitate diffusion

• To maintain the resting membrane potential

• To transport glucose

Which process involves the cell engulfing large particles?

• Exocytosis

• Facilitated diffusion

• Simple diffusion

• Endocytosis

What type of transport requires ATP to move molecules against their concentration gradient?

• Simple diffusion

• Facilitated diffusion

• Passive transport

• Active transport