Question 1

The coenzymes NAD+ and NADP+ are structurally related to the vitamin

Accepted Answer

A)  riboflavin (B2). 
B)  niacin. 
C)  pantothenate. 
D)  pyridoxal (B6). 
A)  riboflavin (B2). 
B)  niacin. 
C)  pantothenate. 
D)  pyridoxal (B6). B

Question 2

Integral membrane proteins are those that

Accepted Answer

A)  directly associate with membrane lipids. 
B)  associate with the membrane indirectly. 
C)  do not span the lipid bilayer. 
D)  None of the above 
A)  directly associate with membrane lipids. 
B)  associate with the membrane indirectly. 
C)  do not span the lipid bilayer. 
D)  None of the above A

Question 3

The function of glycogen, starch, and cellulose is to store glucose.

Accepted Answer

A) True 
 B)False  False

Question 4

The three-dimensional structure of a protein is analyzed most definitively by

Accepted Answer

A)  electron microscopy. 
B)  light microscopy. 
C)  subcellular fractionation. 
D)  X-ray crystallography. 
A)  electron microscopy. 
B)  light microscopy. 
C)  subcellular fractionation. 
D)  X-ray crystallography.

Question 5

Fatty acids are stored in fat droplets in the form of

Accepted Answer

A)  triacylglycerols. 
B)  phospholipids. 
C)  cholesterol. 
D)  glycolipids. 
A)  triacylglycerols. 
B)  phospholipids. 
C)  cholesterol. 
D)  glycolipids.

Question 6

In allosteric regulation of enzyme activity, the regulatory molecules bind to a site that is _______ from the active site of the protein, producing a _______ change in the protein that affects substrate binding to the active site.

Accepted Answer

distal (di

Question 7

What is the major carbohydrate-storage molecule in plants?

Accepted Answer

A)  Starch 
B)  Cellulose 
C)  Glycogen 
D)  Deoxyribonucleic acid 
A)  Starch 
B)  Cellulose 
C)  Glycogen 
D)  Deoxyribonucleic acid

Question 8

Membrane proteins can be anchored to the cytosolic face of the plasma membrane by

Accepted Answer

A)  sugar groups of glycolipids. 
B)  prenyl groups. 
C)  sugar groups of glycoproteins. 
D)  None of the above 
A)  sugar groups of glycolipids. 
B)  prenyl groups. 
C)  sugar groups of glycoproteins. 
D)  None of the above

Question 9

Sphingomyelin is a serine-based phospholipid.

Accepted Answer

A) True 
 B)False

Question 10

Phospholipids consist of a 3-carbon core to which two fatty acids and a phosphate group are linked. The most common 3-carbon core is

Accepted Answer

A)  dihydroxyacetone. 
B)  glyceraldehyde. 
C)  glycerol. 
D)  serine. 
A)  dihydroxyacetone. 
B)  glyceraldehyde. 
C)  glycerol. 
D)  serine.

Question 11

Which of the following is not one of the four major classes of organic molecules in the cell?

Accepted Answer

A)  Carbohydrates 
B)  Lipids 
C)  Water 
D)  Proteins 
A)  Carbohydrates 
B)  Lipids 
C)  Water 
D)  Proteins

Question 12

On which face of the plasma membrane are glycolipids and glycoproteins found?

Accepted Answer

The extrac

Question 13

Enzymes reduce the _______ energy required to reach the _______ state in a chemical reaction.

Accepted Answer

activation

Question 14

Can RNA be considered a polysaccharide?

Accepted Answer

Ribose is a five-carbon sugar, and RNA h

Question 15

The two polypeptide chains in insulin are held together by _______ bonds.

Accepted Answer

The answer of The two polypeptide chains in insulin are...

Question 16

Most proteins interact with other proteins through covalent protein-protein interactions.

Accepted Answer

A) True 
 B)False

Question 17

Channels form pores through which molecules of appropriate size and charge can cross a membrane. By contrast, carrier proteins

Accepted Answer

A)  actively transport molecules. 
B)  selectively bind the molecule to be transported, change configuration, and release it on the other side. 
C)  require ATP. 
D)  transport a molecule against its concentration gradient. 
A)  actively transport molecules. 
B)  selectively bind the molecule to be transported, change configuration, and release it on the other side. 
C)  require ATP. 
D)  transport a molecule against its concentration gradient.

Question 18

The role of double bonds in the fatty acid tails of membrane phospholipids is to

Accepted Answer

A)  help stabilize the membrane. 
B)  react with adjacent double bonds. 
C)  increase membrane fluidity. 
D)  interact with membrane proteins. 
A)  help stabilize the membrane. 
B)  react with adjacent double bonds. 
C)  increase membrane fluidity. 
D)  interact with membrane proteins.

Question 19

Provide the name or three-letter code of one amino acid to fit each of the following descriptions:
a) It is normally positively charged at pH 7.0.
b) Its R group can form ionic bonds with lysine in a protein.
c) It has a hydrophobic R group.
d) It commonly forms covalent bonds between its R group and another identical R group.

Accepted Answer

a) Arginine (Arg), histidine (His), or l

Question 20

Polymerization of nucleotides to form nucleic acids involves the formation of _______ bonds.

Accepted Answer

A)  peptide 
B)  phosphodiester 
C)  glycosidic 
D)  hydrogen 
A)  peptide 
B)  phosphodiester 
C)  glycosidic 
D)  hydrogen

The coenzymes NAD⁺ and NADP⁺ are structurally related to the vitamin

Integral membrane proteins are those that

The function of glycogen, starch, and cellulose is to store glucose.

The three-dimensional structure of a protein is analyzed most definitively by

Fatty acids are stored in fat droplets in the form of

In allosteric regulation of enzyme activity, the regulatory molecules bind to a site that is _ from the active site of the protein, producing a _ change in the protein that affects substrate binding to the active site.

What is the major carbohydrate-storage molecule in plants?

Membrane proteins can be anchored to the cytosolic face of the plasma membrane by

Sphingomyelin is a serine-based phospholipid.

Phospholipids consist of a 3-carbon core to which two fatty acids and a phosphate group are linked. The most common 3-carbon core is

Which of the following is not one of the four major classes of organic molecules in the cell?

On which face of the plasma membrane are glycolipids and glycoproteins found?

Enzymes reduce the _ energy required to reach the _ state in a chemical reaction.

Can RNA be considered a polysaccharide?

The two polypeptide chains in insulin are held together by _______ bonds.

Most proteins interact with other proteins through covalent protein-protein interactions.

Channels form pores through which molecules of appropriate size and charge can cross a membrane. By contrast, carrier proteins

The role of double bonds in the fatty acid tails of membrane phospholipids is to

Polymerization of nucleotides to form nucleic acids involves the formation of _______ bonds.

An Overview of Cells and Cell Research

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

Exam 2: Molecules and Membranes

The coenzymes NAD+ and NADP+ are structurally related to the vitamin

Integral membrane proteins are those that

The function of glycogen, starch, and cellulose is to store glucose.

The three-dimensional structure of a protein is analyzed most definitively by

Fatty acids are stored in fat droplets in the form of

In allosteric regulation of enzyme activity, the regulatory molecules bind to a site that is _______ from the active site of the protein, producing a _______ change in the protein that affects substrate binding to the active site.

What is the major carbohydrate-storage molecule in plants?

Membrane proteins can be anchored to the cytosolic face of the plasma membrane by

Sphingomyelin is a serine-based phospholipid.

Phospholipids consist of a 3-carbon core to which two fatty acids and a phosphate group are linked. The most common 3-carbon core is

Which of the following is not one of the four major classes of organic molecules in the cell?

On which face of the plasma membrane are glycolipids and glycoproteins found?

Enzymes reduce the _______ energy required to reach the _______ state in a chemical reaction.

Can RNA be considered a polysaccharide?

The two polypeptide chains in insulin are held together by _______ bonds.

Most proteins interact with other proteins through covalent protein-protein interactions.

Channels form pores through which molecules of appropriate size and charge can cross a membrane. By contrast, carrier proteins

The role of double bonds in the fatty acid tails of membrane phospholipids is to

Polymerization of nucleotides to form nucleic acids involves the formation of _______ bonds.

An Overview of Cells and Cell Research

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

The coenzymes NAD⁺ and NADP⁺ are structurally related to the vitamin

In allosteric regulation of enzyme activity, the regulatory molecules bind to a site that is _ from the active site of the protein, producing a _ change in the protein that affects substrate binding to the active site.

Enzymes reduce the _ energy required to reach the _ state in a chemical reaction.