Question 1

In the fluid mosaic model of membrane structure

Accepted Answer

A)  the proteins are specifically bonded to the lipids 
B)  the proteins "float" in the lipid bilayer 
C)  the proteins are sandwiched between the lipid molecules 
D)  the lipids are sandwiched between the protein molecules 
A)  the proteins are specifically bonded to the lipids 
B)  the proteins "float" in the lipid bilayer 
C)  the proteins are sandwiched between the lipid molecules 
D)  the lipids are sandwiched between the protein molecules

Question 2

Glycolipids are characterized by containing the following non-lipid component:

Accepted Answer

A)  Sugars 
B)  Glycerol 
C)  Phosphate 
D)  Sphingosine 
E)  More than one of these characterize glycolipids. 
A)  Sugars 
B)  Glycerol 
C)  Phosphate 
D)  Sphingosine 
E)  More than one of these characterize glycolipids.

Question 3

Fatty acids with multiple double bonds are usually conjugated.

Accepted Answer

A) True 
 B)False

Question 4

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 5

The association of membrane proteins with lipids in the membrane bilayer always involves

Accepted Answer

A)  electrostatic interactions 
B)  hydrophobic interactions 
C)  covalent linkages 
D)  all of the above 
A)  electrostatic interactions 
B)  hydrophobic interactions 
C)  covalent linkages 
D)  all of the above

Question 6

What distinguishes primary from secondary active transport?

Accepted Answer

A)  The requirement for protein. 
B)  The type of linkage to ATP hydrolysis 
C)  The number of kinds of molecules or ions transported 
D)  The relative direction of transport 
A)  The requirement for protein. 
B)  The type of linkage to ATP hydrolysis 
C)  The number of kinds of molecules or ions transported 
D)  The relative direction of transport

Question 7

Which of the following is not a characteristic of most fatty acids?

Accepted Answer

A)  Presence of trans double bonds. 
B)  Even number of carbon atoms. 
C)  Only one carboxyl ( − COOH) group. 
D)  Absence of conjugated double bonds. 
E)  All of these characterize lipids. 
A)  Presence of trans double bonds. 
B)  Even number of carbon atoms. 
C)  Only one carboxyl ( − COOH) group. 
D)  Absence of conjugated double bonds. 
E)  All of these characterize lipids.

Question 8

In the sodium-potassium pump

Accepted Answer

A)  sodium is transported out of the cell and potassium into the cell, both against concentration gradients 
B)  sodium is transported into the cell and potassium out of the cell, both against concentration gradients 
C)  sodium is transported out of the cell and potassium into the cell, both in the same direction as concentration gradients 
D)  sodium and potassium are both transported out of the cell against concentration gradients 
A)  sodium is transported out of the cell and potassium into the cell, both against concentration gradients 
B)  sodium is transported into the cell and potassium out of the cell, both against concentration gradients 
C)  sodium is transported out of the cell and potassium into the cell, both in the same direction as concentration gradients 
D)  sodium and potassium are both transported out of the cell against concentration gradients

Question 9

Which of the following best describes lipids' insolubility in water?

Accepted Answer

A)  They are typically very soluble. 
B)  They are typically insoluble. 
C)  There is no general trend as to lipids' solubility in water. 
A)  They are typically very soluble. 
B)  They are typically insoluble. 
C)  There is no general trend as to lipids' solubility in water.

Question 10

The freeze-fracture technique of electron microscopy is useful in studying membrane structure because

Accepted Answer

A)  integral membrane proteins can be seen in association with one leaflet of the lipid bilayer 
B)  all the proteins can be removed from the membrane 
C)  the degree of order of the lipid bilayer can be determined 
D)  the presence of bound carbohydrates can be detected 
A)  integral membrane proteins can be seen in association with one leaflet of the lipid bilayer 
B)  all the proteins can be removed from the membrane 
C)  the degree of order of the lipid bilayer can be determined 
D)  the presence of bound carbohydrates can be detected

Question 11

Liposomes are

Accepted Answer

A)  artificial membrane-bounded structures used to deliver medications. 
B)  single-layered membranes. 
C)  mixed micelles involved in cholesterol transport among cells. 
D)  bilayers with the hydrophobic regions on the outside. 
A)  artificial membrane-bounded structures used to deliver medications. 
B)  single-layered membranes. 
C)  mixed micelles involved in cholesterol transport among cells. 
D)  bilayers with the hydrophobic regions on the outside.

Question 12

The vitamin classified as fat soluble rather than water soluble is

Accepted Answer

A)  vitamin A 
B)  vitamin B1 
C)  vitamin B6 
D)  vitamin C 
A)  vitamin A 
B)  vitamin B1 
C)  vitamin B6 
D)  vitamin C

Question 13

Transport of a compound across a cell membrane (down a concentration gradient) was measured at several concentrations. The presence or absence of ATP had no effect on the transport of this compound. Which best describes the mechanism of transport?

Accepted Answer

A)  facilitated diffusion 
B)  passive diffusion 
C)  primary active transport 
D)  secondary active transport 
E)  proton pumping 
A)  facilitated diffusion 
B)  passive diffusion 
C)  primary active transport 
D)  secondary active transport 
E)  proton pumping

Question 14

The distribution of lipids in membranes is

Accepted Answer

A)  uneven, with bulkier molecules on the exterior 
B)  characterized by even distribution of molecules 
C)  distinguished by the absence of cholesterol 
D)  not well understood 
A)  uneven, with bulkier molecules on the exterior 
B)  characterized by even distribution of molecules 
C)  distinguished by the absence of cholesterol 
D)  not well understood

Question 15

These two lipid vitamins are often found in membranes:

Accepted Answer

A)  A and D 
B)  A and E 
C)  D and E 
D)  E and K 
E)  None of these is the correct pair. 
A)  A and D 
B)  A and E 
C)  D and E 
D)  E and K 
E)  None of these is the correct pair.

Question 16

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 17

Which of the following four fatty acids has the highest melting point?
1) CH3CH2CH2CH2CH2COOH
2) CH3CH2CH2CH2CH2CH2CH2CH 2CH2COOH
3) CH3CH2CH2CH2CH2CH2CH2COOH
4) CH3CH=CHCH2CH2COOH

Accepted Answer

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

Question 18

Which of the following lipids is not found in biological membranes?

Accepted Answer

A)  triacylglycerols 
B)  phosphoacylglycerols 
C)  glycolipids 
D)  cholesterol 
A)  triacylglycerols 
B)  phosphoacylglycerols 
C)  glycolipids 
D)  cholesterol

Question 19

Which of the following is not a lipid-soluble vitamin?

Accepted Answer

A)  Ascorbic Acid 
B)  Cholicalciferol 
C)  Vitamin K 
D)  Retinol 
E)  Tocopherol 
A)  Ascorbic Acid 
B)  Cholicalciferol 
C)  Vitamin K 
D)  Retinol 
E)  Tocopherol

Question 20

The HDL class of lipoprotein is generally believed to be preventative of heart disease.

Accepted Answer

A) True 
 B)False

Exam 8: Lipids and Proteins Are Associated in Biological Membranes

In the fluid mosaic model of membrane structure

Glycolipids are characterized by containing the following non-lipid component:

Fatty acids with multiple double bonds are usually conjugated.

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

The association of membrane proteins with lipids in the membrane bilayer always involves

What distinguishes primary from secondary active transport?

Which of the following is not a characteristic of most fatty acids?

In the sodium-potassium pump

Which of the following best describes lipids' insolubility in water?

The freeze-fracture technique of electron microscopy is useful in studying membrane structure because

Liposomes are

The vitamin classified as fat soluble rather than water soluble is

Transport of a compound across a cell membrane (down a concentration gradient) was measured at several concentrations. The presence or absence of ATP had no effect on the transport of this compound. Which best describes the mechanism of transport?

The distribution of lipids in membranes is

These two lipid vitamins are often found in membranes:

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

Which of the following four fatty acids has the highest melting point? 1) CH3CH2CH2CH2CH2COOH 2) CH3CH2CH2CH2CH2CH2CH2CH 2CH2COOH 3) CH3CH2CH2CH2CH2CH2CH2COOH 4) CH3CH=CHCH2CH2COOH

Which of the following lipids is not found in biological membranes?

Which of the following is not a lipid-soluble vitamin?

The HDL class of lipoprotein is generally believed to be preventative of heart disease.

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

Which of the following four fatty acids has the highest melting point? 1) CH₃CH₂CH₂CH₂CH₂COOH 2) CH₃CH₂CH₂CH₂CH₂CH₂CH₂CH ₂CH₂COOH 3) CH₃CH₂CH₂CH₂CH₂CH₂CH₂COOH 4) CH₃CH=CHCH₂CH₂COOH