Endocytosis and Exocytosis quiz #3 Flashcards
Endocytosis and Exocytosis quiz #3
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Which transport moves larger substances in and out of the cell?
Endocytosis and exocytosis move larger substances in and out of the cell. Which statements are true of receptor-mediated endocytosis?
Receptor-mediated endocytosis involves specific receptor proteins to bind and internalize specific molecules into the cell. What does a cell use exocytosis for?
A cell uses exocytosis to export large molecules, such as hormones and neurotransmitters, out of the cell. Which type of transport is exocytosis and endocytosis?
Exocytosis and endocytosis are types of active transport. What is endocytosis and what is its primary function in the cell?
Endocytosis is the process by which cells engulf large macromolecules via lipid vesicles, allowing these molecules to enter the cell. How does phagocytosis differ from other forms of endocytosis?
Phagocytosis involves the engulfment of large solid materials, such as bacteria, and is often called 'cell eating.' Describe receptor-mediated endocytosis.
Receptor-mediated endocytosis is a specific form of pinocytosis that uses receptor proteins to selectively bring specific molecules into the cell. What is exocytosis and what is its main function?
Exocytosis is the process by which vesicles fuse with the plasma membrane to release their contents outside the cell. Why can't large biomolecules cross the plasma membrane by diffusion or protein channels?
Large biomolecules are too big to pass through the membrane or protein channels, so they require vesicle-mediated transport like endocytosis or exocytosis. How are vesicles involved in both endocytosis and exocytosis?
Vesicles transport large molecules by either fusing with the plasma membrane to release contents (exocytosis) or forming from the membrane to bring substances in (endocytosis). Which type of endocytosis is considered a specific form of pinocytosis?
Receptor-mediated endocytosis is a specific form of pinocytosis. Why is understanding endocytosis and exocytosis important for studying cellular transport?
These processes explain how cells move large molecules that cannot cross the membrane by other means, which is essential for cell function and communication. How does pinocytosis differ from phagocytosis in terms of the material taken up?
Pinocytosis takes in liquids and dissolved substances, while phagocytosis takes in large solid particles. What is a vesicle in the context of endocytosis and exocytosis?
A vesicle is a small, membrane-bound sac that transports substances within or outside the cell. What is the fate of the plasma membrane during repeated cycles of endocytosis and exocytosis?
The plasma membrane maintains its size and composition by balancing vesicle fusion (exocytosis) and vesicle formation (endocytosis). What is the role of lipid vesicles in bulk transport across the cell membrane?
Lipid vesicles encapsulate large molecules, allowing their safe transport into or out of the cell during endocytosis and exocytosis.
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