Questions and Answers
How do primary and secondary active transport mechanisms differ?
The goal of primary active transport is to move ions across the cell membrane against their concentration gradients; the goal of secondary active transport is to establish these same gradients to drive transport of another substance.
Which is not involved in secondary active transport?
Which statement would be true of a membrane-bound protein that works in conjunction with a sodium-potassium pump during secondary active transport?
Its conformation will change when both an ion and a small molecule bind to it.
What is the driving force for active transport?
Signup and view all the answers
For each molecule of ATP consumed during active transport of sodium and potassium, there is an import of _______ ion(s) and an export of _______ ion(s).
Signup and view all the answers
Study Notes
Active Transport Overview
- Primary active transport moves ions across cell membranes against concentration gradients using energy directly from ATP hydrolysis.
- Secondary active transport uses established gradients to transport other substances, relying on the gradients created by primary active transport.
Mechanisms of Active Transport
- Secondary active transport does not directly utilize ATP; instead, it depends on the energy stored in ion gradients.
- Membrane-bound proteins involved in secondary active transport undergo conformational changes when both an ion and a small molecule bind, facilitating the transport process.
Driving Force
- ATP hydrolysis is the primary driving force for active transport mechanisms, providing the necessary energy to move ions.
Ion Transport
- For each ATP molecule consumed during the active transport process:
- Two potassium ions (K+) are imported into the cell.
- Three sodium ions (Na+) are exported out of the cell.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on active transport mechanisms with this flashcard quiz. Understand the differences between primary and secondary active transport and identify key components involved. Perfect for students studying cell biology concepts.
