Question 1

Which of the following amino acids does not have an optical isomer?

Accepted Answer

A)  Arginine 
B)  Cysteine 
C)  Alanine 
D)  Glycine 
E)  Methionine 
A)  Arginine 
B)  Cysteine 
C)  Alanine 
D)  Glycine 
E)  Methionine

Question 2

DNA and RNA both include

Accepted Answer

A)  pentoses. 
B)  hexoses. 
C)  fructoses. 
D)  maltoses. 
E)  amyloses. 
A)  pentoses. 
B)  hexoses. 
C)  fructoses. 
D)  maltoses. 
E)  amyloses.

Question 3

The reaction H-A-OH + H-B- OH $\to$ H-A-B-OH + H2O represents a _______.

Accepted Answer

condensati

Question 4

van der Waals forces can form between _______ side chains in proteins.

Accepted Answer

The answer of van der Waals forces can form between...

Question 5

A fat contains fatty acids and

Accepted Answer

A)  glycerol. 
B)  a base. 
C)  an amino acid. 
D)  a phosphate. 
E)  None of the above 
A)  glycerol. 
B)  a base. 
C)  an amino acid. 
D)  a phosphate. 
E)  None of the above

Question 6

An $\alpha$ helix is an example of the _______ level of protein structure.

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  hepternary 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  hepternary

Question 7

The linear arrangement of amino acids in the polypeptide chain is referred to as the _______ structure of the protein.

Accepted Answer

The answer of The linear arrangement of amino acids in...

Question 8

There are _______ different types of tripeptides (molecules with three amino acids linked together) that can exist using the 20 common amino acids.

Accepted Answer

A)  3 
B)  20 
C)  60 
D)  900 
E)  8,000 
A)  3 
B)  20 
C)  60 
D)  900 
E)  8,000

Question 9

In a biological membrane, the phospholipids are arranged with the fatty acid chains facing the interior of the membrane. As a result, the interior of the membrane is

Accepted Answer

A)  hydrophobic. 
B)  hydrophilic. 
C)  charged. 
D)  polar. 
E)  filled with water. 
A)  hydrophobic. 
B)  hydrophilic. 
C)  charged. 
D)  polar. 
E)  filled with water.

Question 10

The bonds that link sugar monomers in a starch molecule are _______ bonds.

Accepted Answer

The answer of The bonds that link sugar monomers in...

Question 11

The "building blocks" of polysaccharides are _______ and the blocks are covalently linked together by _______ bonds.

Accepted Answer

A)  glycerol and fatty acids; ester 
B)  amino acids; peptide 
C)  monosaccharides; glycosidic 
D)  monosaccharides; ester 
E)  disaccharides; glycosidic 
A)  glycerol and fatty acids; ester 
B)  amino acids; peptide 
C)  monosaccharides; glycosidic 
D)  monosaccharides; ester 
E)  disaccharides; glycosidic

Question 12

The characteristic of phospholipids that allows them to form a bilayer is their

Accepted Answer

A)  hydrophilic fatty acid tail. 
B)  hydrophobic head. 
C)  hydrophobic fatty acid tail. 
D)  hydrophilic glycogen acid tail. 
E)  All of the above 
A)  hydrophilic fatty acid tail. 
B)  hydrophobic head. 
C)  hydrophobic fatty acid tail. 
D)  hydrophilic glycogen acid tail. 
E)  All of the above

Question 13

Molecular chaperones

Accepted Answer

A)  are small molecules. 
B)  are made in decreased amounts after exposure of an organism to high temperatures. 
C)  are absent in insects. 
D)  can prevent harmful interactions by improperly folded proteins. 
E)  bind proteins irreversibly. 
A)  are small molecules. 
B)  are made in decreased amounts after exposure of an organism to high temperatures. 
C)  are absent in insects. 
D)  can prevent harmful interactions by improperly folded proteins. 
E)  bind proteins irreversibly.

Question 14

Leucine and valine do not interact with water; therefore, they

Accepted Answer

A)  are hydrophilic. 
B)  are nonpolar. 
C)  have sulfur atoms in their side chains. 
D)  are electrically charged. 
E)  form only left-hand isomers. 
A)  are hydrophilic. 
B)  are nonpolar. 
C)  have sulfur atoms in their side chains. 
D)  are electrically charged. 
E)  form only left-hand isomers.

Question 15

The amino and carboxyl functional groups tend to form bases and acids by attracting or dropping

Accepted Answer

A)  a neutron. 
B)  a proton. 
C)  an electron. 
D)  a proton and an electron. 
E)  a neutron and a proton. 
A)  a neutron. 
B)  a proton. 
C)  an electron. 
D)  a proton and an electron. 
E)  a neutron and a proton.

Question 16

Which of the following statements about lipids is false?

Accepted Answer

A)  They are readily soluble in water. 
B)  They help capture light energy. 
C)  They release large amounts of energy when broken down. 
D)  They form two layers when mixed with water. 
E)  They act as an energy storehouse. 
A)  They are readily soluble in water. 
B)  They help capture light energy. 
C)  They release large amounts of energy when broken down. 
D)  They form two layers when mixed with water. 
E)  They act as an energy storehouse.

Question 17

Chitin is

Accepted Answer

A)  a polymer of a sugar. 
B)  present in the cell walls of plants. 
C)  a soluble molecule. 
D)  used as an energy reserve in fungi. 
E)  a polymer of a modified sugar. 
A)  a polymer of a sugar. 
B)  present in the cell walls of plants. 
C)  a soluble molecule. 
D)  used as an energy reserve in fungi. 
E)  a polymer of a modified sugar.

Question 18

A molecule that has an important role in limiting what gets into and out of cells is

Accepted Answer

A)  glucose. 
B)  maltose. 
C)  phospholipid. 
D)  fat. 
E)  phosphohexose. 
A)  glucose. 
B)  maltose. 
C)  phospholipid. 
D)  fat. 
E)  phosphohexose.

Question 19

Lactose, or milk sugar, which is composed of one glu­cose unit and one galactose unit, can be classified as a

Accepted Answer

A)  disaccharide. 
B)  hexose. 
C)  pentose. 
D)  polysaccharide. 
E)  monosaccharide. 
A)  disaccharide. 
B)  hexose. 
C)  pentose. 
D)  polysaccharide. 
E)  monosaccharide.

Question 20

Which of the following is responsible for making every amino acid unique?

Accepted Answer

A)  Amino group 
B)  Hydrogen 
C)  Carboxyl group 
D)  "R" group 
E)  Carbon 
A)  Amino group 
B)  Hydrogen 
C)  Carboxyl group 
D)  "R" group 
E)  Carbon

Exam 3: Proteins, Carbohydrates, and Lipids

Which of the following amino acids does not have an optical isomer?

DNA and RNA both include

The reaction H-A-OH + H-B- OH →\to→ H-A-B-OH + H2O represents a _______.

van der Waals forces can form between _______ side chains in proteins.

A fat contains fatty acids and

An α\alphaα helix is an example of the _______ level of protein structure.

The linear arrangement of amino acids in the polypeptide chain is referred to as the _______ structure of the protein.

There are _______ different types of tripeptides (molecules with three amino acids linked together) that can exist using the 20 common amino acids.

In a biological membrane, the phospholipids are arranged with the fatty acid chains facing the interior of the membrane. As a result, the interior of the membrane is

The bonds that link sugar monomers in a starch molecule are _______ bonds.

The "building blocks" of polysaccharides are _______ and the blocks are covalently linked together by _______ bonds.

The characteristic of phospholipids that allows them to form a bilayer is their

Molecular chaperones

Leucine and valine do not interact with water; therefore, they

The amino and carboxyl functional groups tend to form bases and acids by attracting or dropping

Which of the following statements about lipids is false?

Chitin is

A molecule that has an important role in limiting what gets into and out of cells is

Lactose, or milk sugar, which is composed of one glu­cose unit and one galactose unit, can be classified as a

Which of the following is responsible for making every amino acid unique?

Studying Life

Small Molecules and the Chemistry of Life

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Signaling and Communication

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinent Dna and Biotechnology

Differential Gene Expression in Development

Development and Evolutionary Change

Evidence and Mechanisms of Evolution

Reconstructing and Using Phylogenies

Species and Their Formation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria and Archaea: the Prokaryotic Domains

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

Animal Origins and the Evolution of Body Plans

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Function

Musculoskeletal Systems

Gas Exchange in Animals

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen

Animal Behavior

Ecology and the Distribution of Life

Population Ecology

Species Interaction and Coevolution

Community Ecology

Ecosystems and Global Ecology

Conservation Biology

Filters

The reaction H-A-OH + H-B- OH $\to$ H-A-B-OH + H₂O represents a _______.

An $\alpha$ helix is an example of the _______ level of protein structure.

The "building blocks" of polysaccharides are _ and the blocks are covalently linked together by _ bonds.

Lactose, or milk sugar, which is composed of one glucose unit and one galactose unit, can be classified as a