Cells: The living units - Active membrane transport

6 important questions on Cells: The living units - Active membrane transport

How is the transport protein energized in primary active transport?

Hydrolysis of ATP results in phosphorylation of the pump. This step causes the protein to change shape in such a menner that it pumps the bound solute across the membrane

Is the concentration of Na higher inside or outside the cell?

Outside (10x)

How does secondary active transport (co-transport) work?

Secondary transport uses a co-transport protein to couple the 'downhill' movement of one solute to the 'uphill' movement of another solute
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What is receptor mediated endocytosis?

External substance binds to membrane receptor. Activates selective endocytosis and transcytosis

What is vesicular trafficking?

Vesicles pinch off from organelles and travel to other organelles to deliver their cargo

What does the minus sign before the voltage indicate?

The inside of the cell is negative in comparison to the outside of the cell

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