Questions and Answers
A primary active transport process is one in which _________.
molecules move through transport proteins that have been activated by ATP
Some transport processes use transport proteins in the plasma membrane, but do not require ATP. This type of transport is known as _____.
facilitated diffusion
The majority of water molecules moving across plasma membranes by osmosis do so via a process that is most similar to ____.
facilitated diffusion
The sodium-potassium pump uses ATP to move sodium and potassium ions across the plasma membrane. This statement describes _____.
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A vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid. This statement describes _____.
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Study Notes
Membrane Transport Processes
- Primary active transport involves movement of molecules through transport proteins activated by ATP.
- Example of primary active transport: sodium-potassium ATPase (pump) that transports solutes against concentration gradients upon ATP hydrolysis.
- Facilitated diffusion is a passive transport process utilizing transport proteins, allowing molecules to move down their concentration gradients without ATP.
- Majority of water molecules cross plasma membranes by osmosis via facilitated diffusion.
- Sodium-potassium pump illustrates primary active transport by moving sodium and potassium ions across the plasma membrane, utilizing ATP to work against their concentration gradients.
- Exocytosis is a process where a vesicle fuses with the plasma membrane, releasing its contents into the extracellular fluid, meaning "out of the cell."
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Description
Explore the critical mechanisms of membrane transport in this quiz focused on Chapter 11. Understand concepts like primary active transport and the role of ATP in moving molecules across membranes. Ideal for students studying cellular biology and biochemistry.
