Organelles & compartmentalisation - vesicle formation Flashcards
What are vesicles?
Membrane-bound sacs used for transport and storage
Vesicles play a crucial role in cellular processes by facilitating the movement of substances within and outside the cell.
What are peroxisomes?
Vesicles that contain enzymes which digest fatty acids
Peroxisomes are involved in metabolic processes, including the breakdown of hydrogen peroxide.
What is the function of lysosomes?
Contain lytic enzymes which digest cellular waste or harmful substances
Lysosomes are often referred to as the cell’s ‘clean-up crew’.
What are transport vesicles?
Used to move various molecules within the cell
Transport vesicles are essential for intracellular transport and communication.
What are secretory vesicles?
Responsible for transporting substances out of the cell via exocytosis
Secretory vesicles play a significant role in processes such as hormone secretion and neurotransmitter release.
What is the role of clathrin?
Proteins that help with the formation of vesicles
Clathrin is crucial for the endocytosis process, where cells engulf external materials.
How do clathrin-coated pits form?
They form on the surface of the cell membrane
Clathrin-coated pits are essential for the selective uptake of molecules.
What do receptor proteins on the cell surface do?
Bind to the target molecules
This binding is a critical step in the vesicle formation process.
What happens after enough target molecules are attached to the clathrin pit?
Cytoskeleton proteins help the clathrin pit to deepen and eventually seal off
This action traps the target molecules inside, leading to vesicle formation.
True or False: Vesicles are only used for transport within the cell.
False
Vesicles also play a role in storage and secretion of substances outside the cell.
