Question: Question 1 PART I. OVERVIEW OF MEMBRANE TRANSPORT ... Bookmark Questio

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Question: Question 1 PART I. OVERVIEW OF MEMBRANE TRANSPORT ...

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Question 1

PART I. OVERVIEW OF MEMBRANE TRANSPORT

1. Which of the following puts the substances below in the correct order from LEAST permeable to MOST permeable to a given lipid bilayer?

Ca2+,  H2O, CO2,

Question 2

A given substance will require active transport across a lipid bilayer if (choose all that apply):

Question 3

Match each membrane protein with the correct form of transport it uses.

Na+/Glucose Transporter

      [ Choose ]            Uniport            Antiport            Symport      

Glucose Transporter

      [ Choose ]            Uniport            Antiport            Symport      

Na+/K+ ATPase

      [ Choose ]            Uniport            Antiport            Symport      

Question 4

Consider the following scenario:

Molecule X is highly concentrated outside of a cell membrane.

Molecule Y is highly concentrated inside of a cell.

To transport more molecule Y into the cell, the cell could use (choose all that apply):

Question 5

One major difference between porins and ion channels is that ion channels are usually formed from beta barrels, while porins are alpha helical.

Question 6

Match each type of membrane protein with the source of energy that it uses to transport its solute(s).

Na+/Glucose Transporter

      [ Choose ]            Glucose Gradient            K+ Gradient            Na+ Gradient            ATP hydrolysis      

A gated K+ ion channel

      [ Choose ]            Glucose Gradient            K+ Gradient            Na+ Gradient            ATP hydrolysis      

Na+/K+ ATPase

      [ Choose ]            Glucose Gradient            K+ Gradient            Na+ Gradient            ATP hydrolysis      

Glucose Transporter

      [ Choose ]            Glucose Gradient            K+ Gradient            Na+ Gradient            ATP hydrolysis      

Question 7

Which of the following lists the correct order of events that enable the transport of dietary glucose into the blood stream from the intestines?

Question 8

The solute selectivity of porins can be determined by (choose all that apply):

Question 9

Part II. Electrical Properties of Cell Membranes

9. A cell's Resting Membrane Potential (RMP) (choose all that apply):

Question 13

Because ions are electrically charged substances, their movement across the cell membrane follows what is called an electrochemical gradient, which takes into account both the ion's concentration gradient AND the electrical charge distribution across the cell membrane (i.e. membrane potential) .

Given this, Na+ ions moving INTO a resting cell will be moving DOWN their electrochemical gradient because (choose all that apply):

Question 14

A resting cell's membrane is more permeable to K+ simply because:

Explanation / Answer

Ans 1 option A

Lipid bilayer model is least permeable to charged ions, and highly permeable for non polar molecules

So the order goes as H20> CO2> Ca2+

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