Question 1

In bacteria,the porins have the unique ability to transport

Accepted Answer

A) all hydrophilic molecules. 
B) hydrophilic molecules of a particular size. 
C) all hydrophobic molecules. 
D) hydrophobic molecules of a particular size. 
E) any molecule, regardless of properties or size. 
A) all hydrophilic molecules. 
B) hydrophilic molecules of a particular size. 
C) all hydrophobic molecules. 
D) hydrophobic molecules of a particular size. 
E) any molecule, regardless of properties or size.

Question 2

The bacteriorhodopsin proton pump creates a proton gradient that is needed in the process of anoxygenic photosynthesis.The energy necessary to drive this pump is generated by

Accepted Answer

A) the rhodopsin pigment directly. 
B) the proton gradient itself. 
C) GTP hydrolysis. 
D) ATP hydrolysis. 
E) light energy. 
A) the rhodopsin pigment directly. 
B) the proton gradient itself. 
C) GTP hydrolysis. 
D) ATP hydrolysis. 
E) light energy.

Question 3

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

Accepted Answer

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

Question 4

Which of the following is not a mechanism of active transport?

Accepted Answer

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

Question 5

Which of the following glucose transporters in humans has properties that facilitate glucose transport out of the cell in response to keeping blood sugar levels homeostatic?

Accepted Answer

A) GLUT1 
B) GLUT2 
C) GLUT3 
D) GLUT4 
E) GLUT5 
A) GLUT1 
B) GLUT2 
C) GLUT3 
D) GLUT4 
E) GLUT5

Question 6

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 7

The P-type ATPases associated with the movement of heavy metals are

Accepted Answer

A) type 1. 
B) type 2. 
C) type 3. 
D) type 4. 
E) type 5. 
A) type 1. 
B) type 2. 
C) type 3. 
D) type 4. 
E) type 5.

Question 8

What is the ∆G′ for the inward transport of sodium ions?

Accepted Answer

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

Question 9

Which of the following measures is used to determine a substance's polarity?

Accepted Answer

A) partition coefficient 
B) extinction coefficient 
C) polarity factor 
D) asymmetrical distribution points 
E) polarity determining factor 
A) partition coefficient 
B) extinction coefficient 
C) polarity factor 
D) asymmetrical distribution points 
E) polarity determining factor

Question 10

The graph below shows the rate of transport for each substance when the cells are placed in 0.10 mM solutions of A,B,and C.Based on these data and coupled with the data observed above,substance C is transported via ________.

Accepted Answer

The answer of The graph below shows the rate of...

Question 11

While working with a novel cell line,you observe that movement of hydrophobic molecules,such as cholesterol and fatty acids,is impaired.You narrow the defect down to a P-type ATPase

Accepted Answer

A) type 1. 
B) type 2. 
C) type 3. 
D) type 4. 
E) type 5. 
A) type 1. 
B) type 2. 
C) type 3. 
D) type 4. 
E) type 5.

Question 12

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

Accepted Answer

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

Question 13

In the capillaries of the body tissues,CO₂ diffuses ________ and is converted to ________.

Accepted Answer

The answer of In the capillaries of the body tissues,CO₂...

Question 14

Consider the glucose transporters (GLUT).In the case of GLUT1,glucose is transported into the cell for use by the cell.On the other hand,GLUT2 in liver cells allows for glucose to be released by the cells.Why would the body need GLUT systems with such variation?

Accepted Answer

GLUT1 recognizes glucose and brings it i

Question 15

The type of transport ATPase that are reversibly phosphorylated as part of the transport mechanism are the ________ ATPases.

Accepted Answer

The answer of The type of transport ATPase that are...

Question 16

You wish to dehydrate a piece of meat using solutions of varying salt concentrations.The best concentration to use would be

Accepted Answer

A) 0.01%. 
B) 0.09%. 
C) 0.9%. 
D) 1%. 
E) 10%. 
A) 0.01%. 
B) 0.09%. 
C) 0.9%. 
D) 1%. 
E) 10%.

Question 17

The graph above shows the initial rate of transport for each substance when the cells are placed in solutions of different concentrations of A,B,and C.Based on these data,substance A is transported via

Accepted Answer

A) active transport. 
B) facilitated transport. 
C) passive transport. 
D) simple diffusion. 
E) choices A, B, and C 
A) active transport. 
B) facilitated transport. 
C) passive transport. 
D) simple diffusion. 
E) choices A, B, and C

Question 18

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

Accepted Answer

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

Question 19

In the capillaries of the lungs,O₂ diffuses ________ and is bound to ________.

Accepted Answer

The answer of In the capillaries of the lungs,O₂ diffuses...

Question 20

Transmembrane movement of a substance with a concentration gradient utilizing a membrane protein is called ________.

Accepted Answer

passive tr

Exam 8: Transport Across Membranes: Overcoming the Permeability Barrier

In bacteria,the porins have the unique ability to transport

The bacteriorhodopsin proton pump creates a proton gradient that is needed in the process of anoxygenic photosynthesis.The energy necessary to drive this pump is generated by

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

Which of the following is not a mechanism of active transport?

Which of the following glucose transporters in humans has properties that facilitate glucose transport out of the cell in response to keeping blood sugar levels homeostatic?

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

The P-type ATPases associated with the movement of heavy metals are

What is the ∆G′ for the inward transport of sodium ions?

Which of the following measures is used to determine a substance's polarity?

The graph below shows the rate of transport for each substance when the cells are placed in 0.10 mM solutions of A,B,and C.Based on these data and coupled with the data observed above,substance C is transported via ________.

While working with a novel cell line,you observe that movement of hydrophobic molecules,such as cholesterol and fatty acids,is impaired.You narrow the defect down to a P-type ATPase

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

In the capillaries of the body tissues,CO₂ diffuses ________ and is converted to ________.

Consider the glucose transporters (GLUT).In the case of GLUT1,glucose is transported into the cell for use by the cell.On the other hand,GLUT2 in liver cells allows for glucose to be released by the cells.Why would the body need GLUT systems with such variation?

The type of transport ATPase that are reversibly phosphorylated as part of the transport mechanism are the ________ ATPases.

You wish to dehydrate a piece of meat using solutions of varying salt concentrations.The best concentration to use would be

The graph above shows the initial rate of transport for each substance when the cells are placed in solutions of different concentrations of A,B,and C.Based on these data,substance A is transported via

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

In the capillaries of the lungs,O₂ diffuses ________ and is bound to ________.

Transmembrane movement of a substance with a concentration gradient utilizing a membrane protein is called ________.

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: Ielectrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Iimessengers and Receptors

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesions, 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: Ithe Genetic Code and Transcription

Gene Expression: Iiprotein Synthesis and Sorting

The Regulation of Gene Expression

Cancer Cells

Filters

In the capillaries of the body tissues,CO₂ diffuses and is converted to .

In the capillaries of the lungs,O₂ diffuses and is bound to .