Exam 13: Membrane Channels and Pumps

How does the potassium channel maintain selectivity for potassium versus sodium ions?

Describe the proposed mechanism of the lactose permease symporter.

Membrane pumps ____________________(consume,produce,or transduce)energy.

Since we know that certain amino acids are likely to be found in membranes,why is it so difficult to predict the structure of a channel protein?

What is simple diffusion? Provide an example.

What membrane proteins allow specifically charged species to flow freely across a membrane?

Describe the functional domains of the sarcoplasmic reticulum Ca²⁺ ATPase.

What is the general term for membrane transporters that couple uphill transport of one species to the downhill flow of another species?

What amino acid residue receives a phosphoryl group from P-type ATPases?

Cardiotonic steroids such as digitoxigenin inhibit the _______________________.

What are passages that exist between adjacent cells that allow movement of ions and small molecules?

As potassium moves through the ion channel,the associated water molecules

Inorganic ions and most metabolites can flow between the interiors of cells joined by _______________.

The specific transport of a species down its concentration gradient is referred to as _______________________.

Why is it dangerous to eat puffer fish that are not properly prepared?

A channel that opens in response to binding a particular molecule is called a ________ channel.

Give the structure of the modified residue that is involved as an intermediate of P-type ATPases.

What is in the structure of aquaporin that prevents the transport of ions as well as water?

Tetrodotoxin,isolated from puffer fish,binds tightly and specifically to ___________ channels in nerve cells.

What is the "ball-and-chain" model?