Active Transport – Transport Across Cell Membranes
About the Lecture
The lecture Active Transport – Transport Across Cell Membranes by Georgina Cornwall, PhD is from the course Cellular Structure.
Included Quiz Questions
The sodium-potassium pump is characterized by...? Select all that apply.
- … being an antiporter pump.
- ... the hydrolysis of an ATP molecule to transport Na+ ions out and the hydrolysis of one ATP molecule to transport K+ ions in.
- ... allowing both Na+ and K+ ions to move from a region of higher concentration to a lower concentration.
- ... having sodium-potassium ATPase as the transmembrane protein.
- ... transporting 3 Na+ ions outside the cell while transporting 2 K+ into the cell.
Which of the following is INCORRECTLY matched?
- Na+/glucose cotransporter – Primary active transport
- Symport membrane transport – Na+/glucose cotransporter
- Antiport – Na+/K+ pump
- Uniporter – moves a single substance in a single direction
- Active transport across membranes – Utilization of energy
Why do sports drinks contain both sodium and glucose?
- To facilitate the active transport of glucose across cell membranes via the Na+/glucose cotransporter
- To flavor energy drinks
- To facilitate the rapid breakdown of glucose
- To promote the rapid release of energy via the enzymatic breakdown of glucose
- To delay the leakage of K+ from the exterior to the interior of the cell
Which statement is NOT true about the Na+/glucose cotransporter?
- The Na+/glucose cotransporter is involved in primary active transport in the intestine for nutrient absorption.
- The Na+/glucose cotransporter is a symport membrane transport system.
- The Na+/glucose symporter utilizes energy derived from the Na⁺ concentration gradient.
- The Na+/glucose cotransporter is a secondary active transport system as it is dependent on the functioning of the Na+/K+ pump.
- The Na+/glucose cotransporter pumps glucose and Na+ from the external fluid into the cytoplasm.
Which statement is INCORRECT regarding the Na+/K+ pump?
- It is a secondary active-transport mechanism that transports 3 Na+ out of the cell for every 2 K+ pumped into the cell.
- It is a primary active transport mechanism that transports 3 Na+ out of the cell for every 2 K+ pumped into the cell.
- It creates both electrical and chemical gradients across the cell membrane.
- It can be used to drive secondary active transport, in which the generated gradient is used to transport another molecule against its concentration gradient.
- The conformational change to pump Na+ out of a cell requires energy from ATP.
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Author of lecture Active Transport – Transport Across Cell Membranes
Georgina Cornwall, PhD
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Perfectly clear...not sure what the other reviewer is on about.
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