Membrane Transport Flashcards
transport through and with membrane (15 cards)
What is the primary function of ion channels?
To facilitate the passive transport of ions across the cell membrane.
True or False: Active transport requires energy to move substances against their concentration gradient.
True
Fill in the blank: ________ is the process by which cells engulf external substances.
Endocytosis
What are the two main types of endocytosis?
Phagocytosis and pinocytosis.
Which type of transport does not require energy: active transport or passive transport?
Passive transport
Multiple Choice: What type of ion channel opens in response to a change in membrane potential? A) Ligand-gated B) Voltage-gated C) Mechanically-gated
B) Voltage-gated
What is exocytosis?
The process by which cells expel materials in vesicles that fuse with the plasma membrane.
True or False: Pinocytosis is the uptake of large particles or cells.
False
What differentiates facilitated diffusion from simple diffusion?
Facilitated diffusion requires specific transport proteins.
Fill in the blank: The sodium-potassium pump is an example of ________ transport.
Active
Multiple Choice: Which type of endocytosis involves the ingestion of solid particles? A) Phagocytosis B) Pinocytosis C) Receptor-mediated endocytosis
A) Phagocytosis
What role do receptor proteins play in receptor-mediated endocytosis?
They bind to specific molecules (ligands) to initiate endocytosis.
True or False: Ion channels are selective and can allow only specific ions to pass through.
True
What is the significance of concentration gradients in membrane transport?
They drive passive transport processes.
Name one type of molecule that can pass through the cell membrane by simple diffusion.
Oxygen or carbon dioxide.
