Question 1

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 2

Which of the following groups is not present in a cerebroside?

Accepted Answer

A)  Sphingosine 
B)  Fatty acid 
C)  Phosphate 
D)  Sugar 
E)  All of these can be components of cerebrosides. 
A)  Sphingosine 
B)  Fatty acid 
C)  Phosphate 
D)  Sugar 
E)  All of these can be components of cerebrosides.

Question 3

Glycolipids on the surface of cells are especially important as cell markers.

Accepted Answer

A) True 
 B)False

Question 4

How many hydroxyl groups does a molecule of glycerol have?

Accepted Answer

A)  none 
B)  1 
C)  2 
D)  3 
E)  4 
A)  none 
B)  1 
C)  2 
D)  3 
E)  4

Question 5

Facilitated diffusion requires

Accepted Answer

A)  a channel protein through which the transported substance passes without binding 
B)  a carrier protein to which the transported substance binds 
C)  a receptor protein 
D)  expenditure of energy by the cell 
A)  a channel protein through which the transported substance passes without binding 
B)  a carrier protein to which the transported substance binds 
C)  a receptor protein 
D)  expenditure of energy by the cell

Question 6

Which of the following groups is not present in sphingomyelin?

Accepted Answer

A)  Sphingosine 
B)  Fatty acid 
C)  Phosphate 
D)  Sugar 
A)  Sphingosine 
B)  Fatty acid 
C)  Phosphate 
D)  Sugar

Question 7

Exhibit 8A   Refer to Exhibit 8A. Which protein would likely be involved in a channel?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  You cannot tell from the diagram. 
A)  1 
B)  2 
C)  3 
D)  4 
E)  You cannot tell from the diagram.

Question 8

​ Explain the significance of prostaglandins.

Accepted Answer

Prostaglandins control blood pressure, s

Question 9

Phospholipids are particularly important in these structures:

Accepted Answer

A)  Membranes. 
B)  Lipoproteins. 
C)  The brain and nervous system. 
D)  Membranes, the brain and the nervous system. 
E)  All of these are correct. 
A)  Membranes. 
B)  Lipoproteins. 
C)  The brain and nervous system. 
D)  Membranes, the brain and the nervous system. 
E)  All of these are correct.

Question 10

Saponification is the hydrolysis of a(n)

Accepted Answer

A)  peptide bond 
B)  ester bond 
C)  anhydride bond 
D)  glycosidic bond 
A)  peptide bond 
B)  ester bond 
C)  anhydride bond 
D)  glycosidic bond

Question 11

Glycoproteins on the cell surface are involved in this type of function:

Accepted Answer

A)  Cell identification 
B)  Receptor sites 
C)  Immune function 
D)  Cell identification and receptor sites 
E)  All of these are correct. 
A)  Cell identification 
B)  Receptor sites 
C)  Immune function 
D)  Cell identification and receptor sites 
E)  All of these are correct.

Question 12

Sphingolipids are particularly important in these structures:

Accepted Answer

A)  Membranes 
B)  Lipoproteins 
C)  The brain and nervous system. 
D)  Membranes, the brain and the nervous system. 
E)  All of these are correct. 
A)  Membranes 
B)  Lipoproteins 
C)  The brain and nervous system. 
D)  Membranes, the brain and the nervous system. 
E)  All of these are correct.

Question 13

The myelin sheaths of neurons typically contain large amounts of

Accepted Answer

A)  waxes 
B)  triacylglycerols 
C)  cholesterol 
D)  sphingolipids 
A)  waxes 
B)  triacylglycerols 
C)  cholesterol 
D)  sphingolipids

Question 14

Which of the following statements is true?

Accepted Answer

A)  All triacylglycerols and all phosphoacylglycerols have the same fatty acids in them. 
B)  All triacylglycerols have the same fatty acids, but the fatty acids in phosphoacylglycerols vary. 
C)  The fatty acids in triacylglycerols vary, but all phosphoacylglycerols have the same fatty acids in them. 
D)  The fatty acids in both triacylglycerols and in phosphoacylglycerols vary. 
A)  All triacylglycerols and all phosphoacylglycerols have the same fatty acids in them. 
B)  All triacylglycerols have the same fatty acids, but the fatty acids in phosphoacylglycerols vary. 
C)  The fatty acids in triacylglycerols vary, but all phosphoacylglycerols have the same fatty acids in them. 
D)  The fatty acids in both triacylglycerols and in phosphoacylglycerols vary.

Question 15

When a membrane reaches its transition temperature, integral membrane proteins dissociate from the bilayer.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following groups is not present in a phosphatidic acid?

Accepted Answer

A)  Choline 
B)  Fatty acids 
C)  Glycerol 
D)  Phosphate 
E)  All of these are components of phosphatidic acid. 
A)  Choline 
B)  Fatty acids 
C)  Glycerol 
D)  Phosphate 
E)  All of these are components of phosphatidic acid.

Question 17

Which of the following alcohols is never found in phosphatides?

Accepted Answer

A)  Ethanolamine 
B)  Serine 
C)  Inositol 
D)  Sugars 
E)  All of these can be components of phosphatides. 
A)  Ethanolamine 
B)  Serine 
C)  Inositol 
D)  Sugars 
E)  All of these can be components of phosphatides.

Question 18

The following lipid vitamin has important involvement with calcium ions:

Accepted Answer

A)  A 
B)  D 
C)  E 
D)  K 
E)  More than one reacts with calcium ion. 
A)  A 
B)  D 
C)  E 
D)  K 
E)  More than one reacts with calcium ion.

Question 19

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 20

Which of the following molecules is not amphipathic?

Accepted Answer

A)  cholesterol 
B)  glucose 
C)  oleic acid 
D)  phosphatidylcholine 
A)  cholesterol 
B)  glucose 
C)  oleic acid 
D)  phosphatidylcholine

Exam 8: Lipids and Proteins Are Associated in Biological Membranes

A major difficulty in extracting receptor proteins from membranes is that

Which of the following groups is not present in a cerebroside?

Glycolipids on the surface of cells are especially important as cell markers.

How many hydroxyl groups does a molecule of glycerol have?

Facilitated diffusion requires

Which of the following groups is not present in sphingomyelin?

Exhibit 8A Refer to Exhibit 8A. Which protein would likely be involved in a channel?

​ Explain the significance of prostaglandins.

Phospholipids are particularly important in these structures:

Saponification is the hydrolysis of a(n)

Glycoproteins on the cell surface are involved in this type of function:

Sphingolipids are particularly important in these structures:

The myelin sheaths of neurons typically contain large amounts of

Which of the following statements is true?

When a membrane reaches its transition temperature, integral membrane proteins dissociate from the bilayer.

Which of the following groups is not present in a phosphatidic acid?

Which of the following alcohols is never found in phosphatides?

The following lipid vitamin has important involvement with calcium ions:

Which of the following is true?

Which of the following molecules is not amphipathic?

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 the 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

Filters

Explain the significance of prostaglandins.