Question 1

Which of the following is not a function in which lipids play an important role?

Accepted Answer

A)  Vision 
B)  Storing energy 
C)  Membrane structure 
D)  Storing genetic information 
E)  Chemical signaling 
A)  Vision 
B)  Storing energy 
C)  Membrane structure 
D)  Storing genetic information 
E)  Chemical signaling

Question 2

Which of the following statements about the primary structure of a protein is not true?

Accepted Answer

A)  It may be branched. 
B)  It is held together by covalent bonds. 
C)  It is unique to that protein. 
D)  It determines the tertiary structure of the protein. 
E)  It is the sequence of amino acids in the protein. 
A)  It may be branched. 
B)  It is held together by covalent bonds. 
C)  It is unique to that protein. 
D)  It determines the tertiary structure of the protein. 
E)  It is the sequence of amino acids in the protein.

Question 3

The compound inositol has six hydroxyl groups attached to a six-carbon backbone. Thus inositol can be classified as a(n ) _______.

Accepted Answer

The answer of The compound inositol has six hydroxyl groups...

Question 4

A type of molecule very often drawn with a single six-sided ring structure is

Accepted Answer

A)  sucrose. 
B)  an amino acid. 
C)  glucose. 
D)  a fatty acid. 
E)  a steroid. 
A)  sucrose. 
B)  an amino acid. 
C)  glucose. 
D)  a fatty acid. 
E)  a steroid.

Question 5

The functional group written as -COOH is called the _______ group.

Accepted Answer

The answer of The functional group written as -COOH is...

Question 6

What is the theoretical number of different proteins that you could make from 50 amino acids?

Accepted Answer

A)  5020 
B)  20 $\times$ 50 
C)  2050 
D)  1050 
E)  250 
A)  5020 
B)  20 $\times$ 50 
C)  2050 
D)  1050 
E)  250

Question 7

The amino acids of the protein keratin are arranged in a helix. This secondary structure is stabilized by

Accepted Answer

A)  covalent bonds. 
B)  peptide bonds. 
C)  glycosidic linkages. 
D)  polar bonds. 
E)  hydrogen bonds. 
A)  covalent bonds. 
B)  peptide bonds. 
C)  glycosidic linkages. 
D)  polar bonds. 
E)  hydrogen bonds.

Question 8

All living cells contain the monosaccharide _______.

Accepted Answer

The answer of All living cells contain the monosaccharide _______....

Question 9

A macromolecule with many hydrogen and peptide bonds is most likely a

Accepted Answer

A)  carbohydrate. 
B)  lipid. 
C)  protein. 
D)  nucleic acid. 
E)  vitamin. 
A)  carbohydrate. 
B)  lipid. 
C)  protein. 
D)  nucleic acid. 
E)  vitamin.

Question 10

The atoms that make up carbohydrates are

Accepted Answer

A)  C, H, and N. 
B)  C and H. 
C)  C, H, and P. 
D)  C, H, and O. 
E)  C, H, O, and N. 
A)  C, H, and N. 
B)  C and H. 
C)  C, H, and P. 
D)  C, H, and O. 
E)  C, H, O, and N.

Question 11

Glucose and fructose both have the formula C6H12O6, but the atoms in these two compounds are arranged differently. Glucose and fructose are therefore

Accepted Answer

A)  isomers. 
B)  polysaccharides. 
C)  oligosaccharides. 
D)  pentoses. 
E)  steroids. 
A)  isomers. 
B)  polysaccharides. 
C)  oligosaccharides. 
D)  pentoses. 
E)  steroids.

Question 12

Which of the following statements about proteins is true?

Accepted Answer

A)  They are insoluble in water. 
B)  They are the structural units of glycogen. 
C)  They possess glycosidic linkages between amino acids. 
D)  Some function as enzymes. 
E)  They are involved in information storage. 
A)  They are insoluble in water. 
B)  They are the structural units of glycogen. 
C)  They possess glycosidic linkages between amino acids. 
D)  Some function as enzymes. 
E)  They are involved in information storage.

Question 13

The portion of a phospholipid that contains the phosphorous group has one or more electric charges. That makes this region of the molecule

Accepted Answer

A)  hydrophobic. 
B)  hydrophilic. 
C)  nonpolar. 
D)  unsaturated. 
E)  saturated. 
A)  hydrophobic. 
B)  hydrophilic. 
C)  nonpolar. 
D)  unsaturated. 
E)  saturated.

Question 14

Discuss how a protein's three-dimensional structure makes it perfect for acting as a carrier and receptor molecule. In what ways are proteins uniquely suited for this function compared to other macromolecules?

Accepted Answer

The three-dimensional nature o

Question 15

The amphipathic nature of phospholipids is

Accepted Answer

A)  determined by the fatty acid composition. 
B)  important in membrane structure. 
C)  polar but not nonpolar. 
D)  shown only if the lipid is in a nonpolar solvent. 
E)  important in energy storage by lipids. 
A)  determined by the fatty acid composition. 
B)  important in membrane structure. 
C)  polar but not nonpolar. 
D)  shown only if the lipid is in a nonpolar solvent. 
E)  important in energy storage by lipids.

Question 16

The shape of a folded protein is often determined by

Accepted Answer

A)  its tertiary structure. 
B)  the sequence of its amino acids. 
C)  whether the peptide bonds have $\alpha$ or $\beta$ linkages. 
D)  the number of peptide bonds. 
E)  the base-pairing rules. 
A)  its tertiary structure. 
B)  the sequence of its amino acids. 
C)  whether the peptide bonds have $\alpha$ or $\beta$ linkages. 
D)  the number of peptide bonds. 
E)  the base-pairing rules.

Question 17

A simple sugar with the formula C5H10O5 can be classified as a

Accepted Answer

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

Question 18

Aspartate and glutamate are highly soluble in water; therefore, they

Accepted Answer

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

Question 19

Molecules that are both attracted to water and repel water are called

Accepted Answer

A)  hydrophilic. 
B)  hydrophobic. 
C)  amphipathic. 
D)  amphoric. 
E)  glycosidic. 
A)  hydrophilic. 
B)  hydrophobic. 
C)  amphipathic. 
D)  amphoric. 
E)  glycosidic.

Question 20

All proteins

Accepted Answer

A)  are enzymes. 
B)  consist of one or more polypeptide chains. 
C)  are amino acids. 
D)  have quaternary structures. 
E)  are more soluble in nonpolar solvents than in water. 
A)  are enzymes. 
B)  consist of one or more polypeptide chains. 
C)  are amino acids. 
D)  have quaternary structures. 
E)  are more soluble in nonpolar solvents than in water.

Exam 3: Proteins, Carbohydrates, and Lipids

Which of the following is not a function in which lipids play an important role?

Which of the following statements about the primary structure of a protein is not true?

The compound inositol has six hydroxyl groups attached to a six-carbon backbone. Thus inositol can be classified as a(n ) _______.

A type of molecule very often drawn with a single six-sided ring structure is

The functional group written as -COOH is called the _______ group.

What is the theoretical number of different proteins that you could make from 50 amino acids?

The amino acids of the protein keratin are arranged in a helix. This secondary structure is stabilized by

All living cells contain the monosaccharide _______.

A macromolecule with many hydrogen and peptide bonds is most likely a

The atoms that make up carbohydrates are

Glucose and fructose both have the formula C6H12O6, but the atoms in these two compounds are arranged differently. Glucose and fructose are therefore

Which of the following statements about proteins is true?

The portion of a phospholipid that contains the phosphorous group has one or more electric charges. That makes this region of the molecule

Discuss how a protein's three-dimensional structure makes it perfect for acting as a carrier and receptor molecule. In what ways are proteins uniquely suited for this function compared to other macromolecules?

The amphipathic nature of phospholipids is

The shape of a folded protein is often determined by

A simple sugar with the formula C5H10O5 can be classified as a

Aspartate and glutamate are highly soluble in water; therefore, they

Molecules that are both attracted to water and repel water are called

All proteins

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

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Glucose and fructose both have the formula C₆H₁₂O₆, but the atoms in these two compounds are arranged differently. Glucose and fructose are therefore

A simple sugar with the formula C₅H₁₀O₅ can be classified as a