Question 1

Of the following molecules, which would NOT be expected to be moved across a membrane by simple diffusion?

Accepted Answer

A) glucose 
B) oxygen 
C) fatty acids 
D) water 
E) dimethylurea 
A) glucose 
B) oxygen 
C) fatty acids 
D) water 
E) dimethylurea A

Question 2

Which of the following are NOT mechanisms of active transport?

Accepted Answer

A) ATP hydrolysis- driven pump 
B) unidirectional movement with gradients 
C) light- driven pumps 
D) coupled transport 
E) both C and D 
A) ATP hydrolysis- driven pump 
B) unidirectional movement with gradients 
C) light- driven pumps 
D) coupled transport 
E) both C and D B

Question 3

Which of the following is NOT an example of facilitated diffusion?

Accepted Answer

A) anion exchange protein 
B) GluT1 glucose transporter 
C) oxygen transport 
D) ahannel proteins 
E) aquaporins 
A) anion exchange protein 
B) GluT1 glucose transporter 
C) oxygen transport 
D) ahannel proteins 
E) aquaporins C

Question 4

The movement of water through a membrane, from an area of high concentration to an area of low concentration, is known as

Accepted Answer

A) photolysis. 
B) passive transport. 
C) active transport. 
D) facilitated transport. 
E) osmosis. 
A) photolysis. 
B) passive transport. 
C) active transport. 
D) facilitated transport. 
E) osmosis.

Question 5

Base your answers to the questions below on the following information:
A cell biologist interested in the transport of calcium ions (Ca2+)across the plasma membrane of bacterial cells made the following measurements on bacterial cells at 25°C:
Vm = - 150 mV [Ca2+] inside = 20 mM [Ca2+] outside = 0.4 mM
-What is the free energy change for the inward movement of calcium ions into the bacterial cell?

Accepted Answer

A) +4.6 kcal/mol; an exergonic reaction 
B) - 4.6 kcal/mol; an endergonic reaction 
C) - 4.6 kcal/mol; an exergonic reaction 
D) +4.6 kcal/mol; an endergonic reaction 
E) none of the above 
A) +4.6 kcal/mol; an exergonic reaction 
B) - 4.6 kcal/mol; an endergonic reaction 
C) - 4.6 kcal/mol; an exergonic reaction 
D) +4.6 kcal/mol; an endergonic reaction 
E) none of the above

Question 6

When transporting charged molecules across a membrane, which of the following is/are TRUE?

Accepted Answer

A) Keq is always equal to zero. 
B) When moving chloride ions in nerve cells, the movement is with both concentration and electrochemical gradients. 
C) OG° is always equal to one. 
D) Membrane potential is not a factor. 
E) OG is dependent on electrochemical potential. 
A) Keq is always equal to zero. 
B) When moving chloride ions in nerve cells, the movement is with both concentration and electrochemical gradients. 
C) OG° is always equal to one. 
D) Membrane potential is not a factor. 
E) OG is dependent on electrochemical potential.

Question 7

The primary difference between active transport and facilitated diffusion is that only in active transport

Accepted Answer

A) only water molecules move. 
B) [S]high -[S]low. 
C) [S]low -[S]high. 
D) transporter proteins are required. 
E) the concentration gradient provides the necessary energy for movement. 
A) only water molecules move. 
B) [S]high -[S]low. 
C) [S]low -[S]high. 
D) transporter proteins are required. 
E) the concentration gradient provides the necessary energy for movement.

Question 8

The Na+/K+ pump actively moves

Accepted Answer

A) 3 Na+ in 2 K+ out. 
B) 3 Na+ out, 2 K+ in. 
C) 1 Na+ out, 1 K+ in. 
D) 2Na+ out, 3 K+ in. 
E) 2Na+ in, 3 K+ out. 
A) 3 Na+ in 2 K+ out. 
B) 3 Na+ out, 2 K+ in. 
C) 1 Na+ out, 1 K+ in. 
D) 2Na+ out, 3 K+ in. 
E) 2Na+ in, 3 K+ out.

Question 9

Receptor- mediated endocytosis involves vesicles with a special coat protein known as
.

Accepted Answer

The answer of Receptor- mediated endocytosis involves vesicles with a...

Question 10

Transmembrane movement of a substance against a concentration gradient is called
.

Accepted Answer

The answer of Transmembrane movement of a substance against a...

Question 11

The type of transport ATPase found in bacteria, mitochondria, and chloroplasts are the
ATPases.

Accepted Answer

The answer of The type of transport ATPase found in...

Question 12

One mechanism by which ions are specifically transported into the cell is the

Accepted Answer

A) alternating conformation model. 
B) uniport transport model. 
C) carrier protein transport. 
D) gated channel. 
E) all of the above 
A) alternating conformation model. 
B) uniport transport model. 
C) carrier protein transport. 
D) gated channel. 
E) all of the above

Question 13

In examining glucose transport into a cell, the immediate phosphorylation of glucose following its entry into the cell

Accepted Answer

A) puts glucose into a form to be stored. 
B) keeps the glucose from being transported back out of the cell. 
C) allows the cell to maintain higher levels of glucose outside the cell. 
D) puts glucose into a form for use in cellular respiration. 
E) all of the above 
A) puts glucose into a form to be stored. 
B) keeps the glucose from being transported back out of the cell. 
C) allows the cell to maintain higher levels of glucose outside the cell. 
D) puts glucose into a form for use in cellular respiration. 
E) all of the above

Question 14

When transporting uncharged molecules across the membrane, which of the following is/are FALSE?

Accepted Answer

A) OG is not dependent upon a gradient. 
B) movement requires a transport protein. 
C) OG° is always equal to zero. 
D) Keq is always equal to one. 
E) both choices A and B 
A) OG is not dependent upon a gradient. 
B) movement requires a transport protein. 
C) OG° is always equal to zero. 
D) Keq is always equal to one. 
E) both choices A and B

Question 15

Base your answers to the questions on the following information:
For a particular cell, the concentration of sucrose is 10 mM on the inside of the cell and 0.5 mM on the outside, whereas the concentration of sodium ions (Na+)is 0.5 mM on the inside of the cell and 10 mM on the outside. The membrane potential is - 150 mV, and the temperature is 25°C.
Constants: R = 1.987 cal/mol degree; T = 25°C = 298 K; F = 23,062 cal/mole volt
-What would be the net OG' for the coupling of these two reactions?

Accepted Answer

A) - 3.459 kcal/mol 
B) - 1.774 kcal/mol 
C) +3.459 kcal/mol 
D) - 7.007 kcal/mol 
E) +7.007 kcal/mol 
A) - 3.459 kcal/mol 
B) - 1.774 kcal/mol 
C) +3.459 kcal/mol 
D) - 7.007 kcal/mol 
E) +7.007 kcal/mol

Question 16

In the kidney, the specialized transport proteins that allow for very rapid fluid movement into or out of cells are known as

Accepted Answer

A) osmosins. 
B) anion exchange proteins. 
C) aquaporins. 
D) porins. 
E) ionophores. 
A) osmosins. 
B) anion exchange proteins. 
C) aquaporins. 
D) porins. 
E) ionophores.

Question 17

Transmembrane movement of a substance with a concentration gradient, with no involvement of membrane proteins, is called _.

Accepted Answer

The answer of Transmembrane movement of a substance with a...

Question 18

Facilitated diffusion implies that energy in which form is NOT required?

Accepted Answer

A) Na+ 
B) glucose 
C) oxygen 
D) light 
E) ATP 
A) Na+ 
B) glucose 
C) oxygen 
D) light 
E) ATP

Question 19

Base your answers to the questions on the following information:
For a particular cell, the concentration of sucrose is 10 mM on the inside of the cell and 0.5 mM on the outside, whereas the concentration of sodium ions (Na+)is 0.5 mM on the inside of the cell and 10 mM on the outside. The membrane potential is - 150 mV, and the temperature is 25°C.
Constants: R = 1.987 cal/mol degree; T = 25°C = 298 K; F = 23,062 cal/mole volt
-What is the OG' for the inward transport of sodium ions?

Accepted Answer

A) +5.233 kcal/mol; an exergonic reaction 
B) - 5.233 kcal/mol; an exergonic reaction 
C) - 5.233 kcal/mol; an endergonic reaction 
D) +5.233 kcal/mol; an endergonic reaction 
E) none of the above 
A) +5.233 kcal/mol; an exergonic reaction 
B) - 5.233 kcal/mol; an exergonic reaction 
C) - 5.233 kcal/mol; an endergonic reaction 
D) +5.233 kcal/mol; an endergonic reaction 
E) none of the above

Question 20

You are wanting to modify plant cells. With the procedure you are using, the plant cells must be in a plasmolyzed state. This means that the plant cells must be placed in a(n)

Accepted Answer

A) isotonic solution. 
B) hypertonic solution. 
C) basic solution. 
D) acid solution. 
E) hypotonic solution. 
A) isotonic solution. 
B) hypertonic solution. 
C) basic solution. 
D) acid solution. 
E) hypotonic solution.

Exam 8: Transport Across Membranes: Overcoming the Permeability Barrier

Of the following molecules, which would NOT be expected to be moved across a membrane by simple diffusion?

Which of the following are NOT mechanisms of active transport?

Which of the following is NOT an example of facilitated diffusion?

The movement of water through a membrane, from an area of high concentration to an area of low concentration, is known as

When transporting charged molecules across a membrane, which of the following is/are TRUE?

The primary difference between active transport and facilitated diffusion is that only in active transport

The Na+/K+ pump actively moves

Receptor- mediated endocytosis involves vesicles with a special coat protein known as .

Transmembrane movement of a substance against a concentration gradient is called .

The type of transport ATPase found in bacteria, mitochondria, and chloroplasts are the ATPases.

One mechanism by which ions are specifically transported into the cell is the

In examining glucose transport into a cell, the immediate phosphorylation of glucose following its entry into the cell

When transporting uncharged molecules across the membrane, which of the following is/are FALSE?

In the kidney, the specialized transport proteins that allow for very rapid fluid movement into or out of cells are known as

Transmembrane movement of a substance with a concentration gradient, with no involvement of membrane proteins, is called _.

Facilitated diffusion implies that energy in which form is NOT required?

You are wanting to modify plant cells. With the procedure you are using, the plant cells must be in a plasmolyzed state. This means that the plant cells must be placed in a(n)

A Preview of the Cell

The Chemistry of the Cell

The Macromolecules of the Cell

Cells and Organelles

Bioenergetics: The Flow of Energy in the Cell

Enzymes: The Catalysts of Life

Membranes: Their Structure, Function, and Chemistry

Chemotrophic Energy Metabolism: Glycolysis and Fermentation

Chemotrophic Energy Metabolism: Aerobic Respiration

Phototrophic Energy Metabolism: Photosynthesis

The Endomembrane System and Peroxisomes

Signal Transduction Mechanisms: I Electrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Ii Messengers and Receptors

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesion, Cell Junctions, and Extracellular Structures

The Structural Basis of Cellular Information: DNA, Chromosomes, and the Nucleus

The Cell Cycle, Dna Replication, and Mitosis

Sexual Reproduction, Meiosis, and Genetic Recombination

Gene Expression: I the Genetic Code and Transcription

Gene Expression: II Protein Synthesis and Sorting

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