Question 1

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

Accepted Answer

passive tr...

Question 2

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

Accepted Answer

A)   gap interchanges
B)   gap exchanges
C)   gap crossings
D)   gap intersections
E)   gap junctionsF) A) and E)
G) C) and E)

Question 3

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

Accepted Answer

Two loops containing hydrophil...

Question 4

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

Accepted Answer

A)   serine
B)   tyrosine
C)   cysteine
D)   lysine
E)   aspartateF) A) and B)
G) All of the above

Question 5

Cardiotonic steroids such as digitoxigenin inhibit the _______________________.

Accepted Answer

The answer of Cardiotonic steroids such as digitoxigenin inhibit the...

Question 6

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

Accepted Answer

A)   cotransporters
B)   antiporters
C)   symporters
D)   uniporters
E)   None of the answers is correct.F) A) and E)
G) A) and D)

Question 7

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?

Accepted Answer

A single membrane-binding domain is unli...

Question 8

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

Accepted Answer

A)   aquaporins
B)   sodium potassium ATPase
C)   glucose transporter
D)   ion channels
E)   None of the answers is correct.F) B) and C)
G) A) and B)

Question 9

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

Accepted Answer

"Ball-and-chain" is a model of inactivat...

Question 10

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

Accepted Answer

The protein has an integral membrane dom...

Question 11

Describe the proposed mechanism of the lactose permease symporter.

Accepted Answer

1.The cycle begins with the two halves o...

Question 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

A)   are shed.
B)   remain bound.
C)   are rearranged around the ion.
D)   react with CO2.
E)   None of the answers is correct.F) B) and E)
G) None of the above

Question 14

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

Accepted Answer

The answer of Inorganic ions and most metabolites can flow...

Question 15

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

Accepted Answer

Puffer fish contain tetrodotox...

Question 16

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

Accepted Answer

The answer of Tetrodotoxin,isolated from puffer fish,binds tightly and specifically...

Question 17

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

Accepted Answer

β-phosphor...

Question 18

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

Accepted Answer

A)   passive diffusion
B)   symport
C)   ligand-gated
D)   ABC-protein
E)   None of the answers is correct.F) A) and C)
G) A) and B)

Question 19

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

Accepted Answer

A)   The ion size is the determining factor.
B)   The size of the ion and associated waters relative to the pore size are the determining factors in channel selectivity.
C)   Dehydration of the potassium ion is compensated energetically by interactions with oxygen atoms in the selectivity filter, which is not possible with sodium ions.
D)   Potassium ions associate with six molecules of water while sodium associates with four, thus allowing selectivity.
E)   None of the answers is correct.F) C) and D)
G) A) and D)

Question 20

What is simple diffusion? Provide an example.

Accepted Answer

In simple diffusion,molecules pass throu...

Exam 13: Membrane Channels and Pumps

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

Correct AnswerverifiedShow Answer

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

Correct Answerverified"Ball-and-chain" is a model of inactivat...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedPuffer fish contain tetrodotox...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedpassive tr...View AnswerShow Answer

Describe the proposed mechanism of the lactose permease symporter.

Correct Answerverified1.The cycle begins with the two halves o...View AnswerShow Answer

Cardiotonic steroids such as digitoxigenin inhibit the _______________________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedA single membrane-binding domain is unli...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedβ-phosphor...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedThe protein has an integral membrane dom...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedTwo loops containing hydrophil...View AnswerShow Answer

What is simple diffusion? Provide an example.

Correct AnswerverifiedIn simple diffusion,molecules pass throu...View AnswerShow Answer

Correct Answer
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Correct Answer
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"Ball-and-chain" is a model of inactivat...
View Answer

Correct Answer
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Correct Answer
verified
Puffer fish contain tetrodotox...
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Correct Answer
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Correct Answer
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Correct Answer
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passive tr...
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Correct Answer
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1.The cycle begins with the two halves o...
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Correct Answer
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Correct Answer
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Correct Answer
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A single membrane-binding domain is unli...
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Correct Answer
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Correct Answer
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β-phosphor...
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Correct Answer
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Describe the functional domains of the sarcoplasmic reticulum Ca²⁺ ATPase.

Correct Answer
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The protein has an integral membrane dom...
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Two loops containing hydrophil...
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Correct Answer
verified
In simple diffusion,molecules pass throu...
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