Question 1

Aspirin produces most of its analgesic effects by

Accepted Answer

A)  binding to the plasma membrane of nerve cells 
B)  inhibiting the synthesis of vitamin A 
C)  inhibiting the synthesis of phospholipids 
D)  inhibiting the synthesis of prostaglandins 
A)  binding to the plasma membrane of nerve cells 
B)  inhibiting the synthesis of vitamin A 
C)  inhibiting the synthesis of phospholipids 
D)  inhibiting the synthesis of prostaglandins D

Question 2

The key reaction of eyesight (in dim light) involving vitamin A is:

Accepted Answer

A)  Reaction of the protein complex called Rhodopsin. 
B)  A cis-trans isomerization of a double bond. 
C)  Bleaching of a pigment in the retina. 
D)  Reaction of Rhodopsin and cis-trans isomerization of a double bond. 
E)  All of these. 
A)  Reaction of the protein complex called Rhodopsin. 
B)  A cis-trans isomerization of a double bond. 
C)  Bleaching of a pigment in the retina. 
D)  Reaction of Rhodopsin and cis-trans isomerization of a double bond. 
E)  All of these. E

Question 3

A useful method for studying membrane proteins in place in the membrane is

Accepted Answer

A)  nuclear magnetic resonance 
B)  x-ray crystallography 
C)  treatment with mercaptoethanol 
D)  treatment with detergents 
A)  nuclear magnetic resonance 
B)  x-ray crystallography 
C)  treatment with mercaptoethanol 
D)  treatment with detergents A

Question 4

Which of the following is not true?

Accepted Answer

A)  Receptors are often invaginated into the cell after binding to their specific molecule. 
B)  A given receptor type is present at a constant level on the outside of a cell 
C)  In certain disease states, the level of a given receptor is increased or decreased 
D)  Binding of receptors to ligands sometimes shows hyperbolic binding curves 
A)  Receptors are often invaginated into the cell after binding to their specific molecule. 
B)  A given receptor type is present at a constant level on the outside of a cell 
C)  In certain disease states, the level of a given receptor is increased or decreased 
D)  Binding of receptors to ligands sometimes shows hyperbolic binding curves

Question 5

With what compound are fatty acids reacted to make a fat or oil?

Accepted Answer

A)  cholesterol 
B)  glycerol 
C)  sphinganine 
D)  ceramide 
A)  cholesterol 
B)  glycerol 
C)  sphinganine 
D)  ceramide

Question 6

How does cholesterol affect membrane fluidity?

Accepted Answer

A)  It tends to increase the fluidity. 
B)  It tends to decrease the fluidity. 
C)  It doesn't have any specific effect on fluidity. 
A)  It tends to increase the fluidity. 
B)  It tends to decrease the fluidity. 
C)  It doesn't have any specific effect on fluidity.

Question 7

What does amphipathic mean?

Accepted Answer

A)  having both positive and negative charges 
B)  having both acid and base properties 
C)  having both hydrophilic and hydrophobic regions 
D)  having two stereoisomers 
A)  having both positive and negative charges 
B)  having both acid and base properties 
C)  having both hydrophilic and hydrophobic regions 
D)  having two stereoisomers

Question 8

A major difficulty in extracting receptor proteins from membranes is that

Accepted Answer

A)  it is difficult to remove the proteins from the membrane without denaturation 
B)  there may be very few molecules of the protein in a cell 
C)  receptor proteins tend to have high molecular weights 
D)  all of these 
A)  it is difficult to remove the proteins from the membrane without denaturation 
B)  there may be very few molecules of the protein in a cell 
C)  receptor proteins tend to have high molecular weights 
D)  all of these

Question 9

Which of the following methods of transport across a membrane does not require a protein?

Accepted Answer

A)  Passive transport 
B)  Facilitated transport 
C)  Active Transport 
D)  Simple diffusion 
A)  Passive transport 
B)  Facilitated transport 
C)  Active Transport 
D)  Simple diffusion

Question 10

Exhibit 8A   Refer to Exhibit 8A.Protein #2 would most likely function as a:

Accepted Answer

A)  Carrier 
B)  Channel 
C)  Cell identity 
D)  Receptor 
E)  You cannot tell from the diagram. 
A)  Carrier 
B)  Channel 
C)  Cell identity 
D)  Receptor 
E)  You cannot tell from the diagram.

Question 11

Passive transport is the same as:

Accepted Answer

A)  simple diffusion 
B)  facilitated diffusion 
C)  active transport 
D)  primary active transport 
A)  simple diffusion 
B)  facilitated diffusion 
C)  active transport 
D)  primary active transport

Question 12

Which of the following is true?

Accepted Answer

A)  Fatty acids with trans double bonds may be particularly unhealthy because they increase the ratio of LDLs to HDLs. 
B)  A fatty acid with 14 carbons and one trans double bond will behave more like a saturated fatty acid with 14 carbons than will an unsaturated fatty acid with a cis double bond. 
C)  Fatty acids with trans double bonds can be formed by hydrogenation reaction of polyunssaturated fatty acids 
D)  fatty acids with trans double bonds tend to have higher melting points than those with cis double bonds all else being equal 
E)  All of these are correct 
A)  Fatty acids with trans double bonds may be particularly unhealthy because they increase the ratio of LDLs to HDLs. 
B)  A fatty acid with 14 carbons and one trans double bond will behave more like a saturated fatty acid with 14 carbons than will an unsaturated fatty acid with a cis double bond. 
C)  Fatty acids with trans double bonds can be formed by hydrogenation reaction of polyunssaturated fatty acids 
D)  fatty acids with trans double bonds tend to have higher melting points than those with cis double bonds all else being equal 
E)  All of these are correct

Question 13

The following lipid vitamin is often used to preserve foods from spoiling:

Accepted Answer

A)  A 
B)  D 
C)  E 
D)  K 
E)  None of these preserves food. 
A)  A 
B)  D 
C)  E 
D)  K 
E)  None of these preserves food.

Question 14

What characteristic is most used to define lipids?

Accepted Answer

A)  ionic charge 
B)  melting point 
C)  solubility 
D)  ability to bind metal ions 
A)  ionic charge 
B)  melting point 
C)  solubility 
D)  ability to bind metal ions

Question 15

Plants need cholesterol in their membranes to counteract the rigidity of the cell wall.

Accepted Answer

A) True 
 B)False

Question 16

The order-disorder transition (melting) in membranes

Accepted Answer

A)  is cooperative 
B)  can be monitored by fluorescence techniques 
C)  can be monitored by spin labeling 
D)  all of these 
A)  is cooperative 
B)  can be monitored by fluorescence techniques 
C)  can be monitored by spin labeling 
D)  all of these

Question 17

Which of the following four fatty acids has the lowest melting point?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 18

Which of the following lipid molecules possess a different fundamental structural make-up from the others?

Accepted Answer

A)  Fatty acids 
B)  Cholesterol 
C)  Triglycerides 
D)  Sphingolipids 
E)  Glycolipids 
A)  Fatty acids 
B)  Cholesterol 
C)  Triglycerides 
D)  Sphingolipids 
E)  Glycolipids

Question 19

Which of the following is true?

Accepted Answer

A)  All fatty acids have an even number of carbons 
B)  Most fatty acids have an odd number of carbons 
C)  Fatty acids are equally likely to have an even number of carbons as they are an odd number 
D)  Fatty acids with an odd number of carbons are more rare than those with an even number 
A)  All fatty acids have an even number of carbons 
B)  Most fatty acids have an odd number of carbons 
C)  Fatty acids are equally likely to have an even number of carbons as they are an odd number 
D)  Fatty acids with an odd number of carbons are more rare than those with an even number

Question 20

Which of the following statements concerning active transport is true?

Accepted Answer

A)  It takes place in the same direction as a concentration gradient. 
B)  It requires no expenditure of energy by the cell. 
C)  It can be compared to water running downhill. 
D)  A membrane-associate protein must be involved. 
A)  It takes place in the same direction as a concentration gradient. 
B)  It requires no expenditure of energy by the cell. 
C)  It can be compared to water running downhill. 
D)  A membrane-associate protein must be involved.

Exam 8: Lipids and Proteins Are Associated in Biological Membranes

Aspirin produces most of its analgesic effects by

The key reaction of eyesight (in dim light) involving vitamin A is:

A useful method for studying membrane proteins in place in the membrane is

Which of the following is not true?

With what compound are fatty acids reacted to make a fat or oil?

How does cholesterol affect membrane fluidity?

What does amphipathic mean?

A major difficulty in extracting receptor proteins from membranes is that

Which of the following methods of transport across a membrane does not require a protein?

Exhibit 8A Refer to Exhibit 8A.Protein #2 would most likely function as a:

Passive transport is the same as:

Which of the following is true?

The following lipid vitamin is often used to preserve foods from spoiling:

What characteristic is most used to define lipids?

Plants need cholesterol in their membranes to counteract the rigidity of the cell wall.

The order-disorder transition (melting) in membranes

Which of the following four fatty acids has the lowest melting point?

Which of the following lipid molecules possess a different fundamental structural make-up from the others?

Which of the following is true?

Which of the following statements concerning active transport is true?

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism: Cellular Signaling

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