Question 1

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 2

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 3

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 4

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 5

Unsaturated fatty acids usually have ____ double bonds.

Accepted Answer

A)  cis 
B)  trans 
A)  cis 
B)  trans

Question 6

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 7

Which of the following treatments would be most useful in separating an integral membrane protein from the lipid component of a cell membrane?

Accepted Answer

A)  Change the pH. 
B)  Add a salt. 
C)  Add a detergent. 
D)  Add a mixture of proteases. 
E)  None of these. You can't separate an integral membrane protein from the lipid. 
A)  Change the pH. 
B)  Add a salt. 
C)  Add a detergent. 
D)  Add a mixture of proteases. 
E)  None of these. You can't separate an integral membrane protein from the lipid.

Question 8

There are likely to be huge stores of lipid vitamins in healthy animals.

Accepted Answer

A) True 
 B)False

Question 9

What kinds of bonds do lipase break in order to release fatty acids from triacylglycerols?

Accepted Answer

A)  esters 
B)  carbon-carbon single bonds 
C)  carbon-carbon double bonds 
D)  There are no fatty acids in triacylglycerols to release. 
A)  esters 
B)  carbon-carbon single bonds 
C)  carbon-carbon double bonds 
D)  There are no fatty acids in triacylglycerols to release.

Question 10

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 11

The mechanism of membrane transport may involve the following:

Accepted Answer

A)  ATP hydrolysis. 
B)  Conformation change of membrane proteins. 
C)  Phosphorylation or dephosphorylation of membrane proteins. 
D)  ATP hydrolysis and conformation change of membrane proteins. 
E)  All of these are correct. 
A)  ATP hydrolysis. 
B)  Conformation change of membrane proteins. 
C)  Phosphorylation or dephosphorylation of membrane proteins. 
D)  ATP hydrolysis and conformation change of membrane proteins. 
E)  All of these are correct.

Question 12

Which of the following does not belong in the list?

Accepted Answer

A)  Retinol 
B)  Vitamin A 
C)  beta-carotene 
D)  Cholesterol 
A)  Retinol 
B)  Vitamin A 
C)  beta-carotene 
D)  Cholesterol

Question 13

Which of the following cell types contains cholesterol?

Accepted Answer

A)  bacteria 
B)  animal 
C)  plant 
D)  They all contain cholesterol. 
A)  bacteria 
B)  animal 
C)  plant 
D)  They all contain cholesterol.

Question 14

Membranes are generally symmetrical,i.e.,the outer face is composed of the same number and types of phospholipids as the inner face.

Accepted Answer

A) True 
 B)False

Question 15

The vitamin needed for blood coagulation is

Accepted Answer

A)  vitamin A 
B)  vitamin D 
C)  vitamin E 
D)  vitamin K 
A)  vitamin A 
B)  vitamin D 
C)  vitamin E 
D)  vitamin K

Question 16

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 17

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 18

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

Accepted Answer

A) True 
 B)False

Question 19

Exhibit 8A   Refer to Exhibit 8A.Which protein might help to identify the cell type?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  More than one could help identify the cell type. 
A)  1 
B)  2 
C)  3 
D)  4 
E)  More than one could help identify the cell type.

Question 20

I find that briefly washing cells in a buffered solution at pH 11 is effective for isolating a cell membrane-associated hormone receptor.(A standard growth solution for the cells is pH 7.) Which of following best fits this description?

Accepted Answer

A)  This is an integral membrane protein that completely traverses the cell membrane. 
B)  This is an integral membrane protein that only penetrates one leaf of the cell membrane. 
C)  This is a peripheral membrane protein that probably interacts with membrane phospholipids using aspartate-mediated salt bridges. 
D)  This is a peripheral membrane protein that probably interacts with membrane phospholipids using lysine-mediated salt bridges. 
A)  This is an integral membrane protein that completely traverses the cell membrane. 
B)  This is an integral membrane protein that only penetrates one leaf of the cell membrane. 
C)  This is a peripheral membrane protein that probably interacts with membrane phospholipids using aspartate-mediated salt bridges. 
D)  This is a peripheral membrane protein that probably interacts with membrane phospholipids using lysine-mediated salt bridges.

Exam 8: Lipids and Proteins Are Associated in Biological Membranes

The following lipid vitamin has important involvement with calcium ions:

The myelin sheaths of neurons typically contain large amounts of

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

In the fluid mosaic model of membrane structure

Unsaturated fatty acids usually have ____ double bonds.

Sphingolipids are particularly important in these structures:

Which of the following treatments would be most useful in separating an integral membrane protein from the lipid component of a cell membrane?

There are likely to be huge stores of lipid vitamins in healthy animals.

What kinds of bonds do lipase break in order to release fatty acids from triacylglycerols?

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

The mechanism of membrane transport may involve the following:

Which of the following does not belong in the list?

Which of the following cell types contains cholesterol?

Membranes are generally symmetrical,i.e.,the outer face is composed of the same number and types of phospholipids as the inner face.

The vitamin needed for blood coagulation 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

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

Exhibit 8A Refer to Exhibit 8A.Which protein might help to identify the cell type?

I find that briefly washing cells in a buffered solution at pH 11 is effective for isolating a cell membrane-associated hormone receptor.(A standard growth solution for the cells is pH 7.) Which of following best fits this description?

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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