Question 1

Which of the following biological molecules possess large nonpolar regions, making them insoluble in water?

Accepted Answer

A)  Carbohydrates 
B)  Lipids 
C)  Nucleic acids 
D)  Proteins 
A)  Carbohydrates 
B)  Lipids 
C)  Nucleic acids 
D)  Proteins B

Question 2

Which of the following statements about lipids is incorrect?

Accepted Answer

A)  They are used for energy storage. 
B)  They are primary component of cell membranes. 
C)  They are large chains of nonpolar hydrocarbons. 
D)  They are hydrophobic and water insoluble. 
E)  They are short chains of polar hydrocarbons. 
A)  They are used for energy storage. 
B)  They are primary component of cell membranes. 
C)  They are large chains of nonpolar hydrocarbons. 
D)  They are hydrophobic and water insoluble. 
E)  They are short chains of polar hydrocarbons. E

Question 3

A peptide bond forms between which of these groups?

Accepted Answer

A)  Amino and aldehyde 
B)  Carboxyl and aldehyde 
C)  Carboxyl and amino 
D)  Phosphate and hydroxyl 
E)  Hydroxyl and carboxyl 
A)  Amino and aldehyde 
B)  Carboxyl and aldehyde 
C)  Carboxyl and amino 
D)  Phosphate and hydroxyl 
E)  Hydroxyl and carboxyl C

Question 4

As shown in this figure, the valine and lysine in this protein are linked by covalent bonds within the structure, whereas the hydrogen bonds hold together molecules within the helical structure.
   
A) secondary; quaternary
B) tertiary; quaternary
C) secondary; tertiary
D) primary; secondary
E) primary; tertiary

Accepted Answer

D
Soap and detergent molecules have a lo

Question 5

When the level of glucose in your blood is high, your body is able to store excess glucose in the liver by forming glycogen. When blood glucose levels fall, this stored glucose can be released. Based on this information, which of the following is TRUE?

Accepted Answer

A)  Glycogen is a polysaccharide formed by joining excess monosaccharides of glucose. 
B)  Glucose is not an organic molecule, but glycogen is an organic molecule. 
C)  Glycogen is a highly branched functional group that forms a larger glucose polymer. 
D)  Glucose is a polysaccharide that can join to form the monosaccharide glycogen. 
A)  Glycogen is a polysaccharide formed by joining excess monosaccharides of glucose. 
B)  Glucose is not an organic molecule, but glycogen is an organic molecule. 
C)  Glycogen is a highly branched functional group that forms a larger glucose polymer. 
D)  Glucose is a polysaccharide that can join to form the monosaccharide glycogen.

Question 6

What are some of the similarities and differences between DNA and RNA?

Accepted Answer

DNA uses the nucleotides A- T- G- C, and

Question 7

The "backbone" of a nucleic acid molecule is made of

Accepted Answer

A)  lipids. 
B)  NAD+ and FAD. 
C)  amino acids. 
D)  sugar and phosphate groups. 
E)  ATP molecules. 
A)  lipids. 
B)  NAD+ and FAD. 
C)  amino acids. 
D)  sugar and phosphate groups. 
E)  ATP molecules.

Question 8

Which of the following reactions is an example of dehydration synthesis?

Accepted Answer

A)  Glucose + galactose -lactose 
B)  Fat -fatty acids + glycerol 
C)  Cellulose -glucose 
D)  Glycogen -glucose subunits 
E)  Peptide -alanine + glycine 
A)  Glucose + galactose -lactose 
B)  Fat -fatty acids + glycerol 
C)  Cellulose -glucose 
D)  Glycogen -glucose subunits 
E)  Peptide -alanine + glycine

Question 9

Your classmate is trying to keep all the facts about biological molecules straight. He asks you to explain how amino acids and proteins are related. What do you tell him?

Accepted Answer

A)  Proteins are made up of chains of amino acids. 
B)  Amino acids are formed by joining together many proteins. 
C)  Proteins are chains of carbohydrates, and amino acids are a type of lipid. 
D)  Proteins are a portion of an amino acid. 
A)  Proteins are made up of chains of amino acids. 
B)  Amino acids are formed by joining together many proteins. 
C)  Proteins are chains of carbohydrates, and amino acids are a type of lipid. 
D)  Proteins are a portion of an amino acid.

Question 10

Which of the following refers to the amino acid sequence of proteins?

Accepted Answer

A)  Primary 
B)  Secondary 
C)  Tertiary 
D)  Quaternary 
A)  Primary 
B)  Secondary 
C)  Tertiary 
D)  Quaternary

Question 11

What type of chemical reaction results in the breakdown of organic polymers into their respective subunits?

Accepted Answer

A)  Ionization 
B)  Oxidation 
C)  Hydrolysis 
D)  Condensation 
A)  Ionization 
B)  Oxidation 
C)  Hydrolysis 
D)  Condensation

Question 12

Fats and oils are made of

Accepted Answer

A)  three fatty acids and one glycerol. 
B)  two fatty acids and one carboxyl acid. 
C)  three glycerols and three fatty acids. 
D)  three amino acids and one glycerol. 
E)  one glycogen and two phospholipids. 
A)  three fatty acids and one glycerol. 
B)  two fatty acids and one carboxyl acid. 
C)  three glycerols and three fatty acids. 
D)  three amino acids and one glycerol. 
E)  one glycogen and two phospholipids.

Question 13

Which of the following biological molecules are composed of monomer units containing a sugar, a phosphate group, and a nitrogen- containing base?

Accepted Answer

A)  Carbohydrates 
B)  Nucleic acids 
C)  Proteins 
D)  Lipids 
A)  Carbohydrates 
B)  Nucleic acids 
C)  Proteins 
D)  Lipids

Question 14

Which of the following can serve as an energy source and as structural support in plant cells?

Accepted Answer

A)  Lipids 
B)  Proteins 
C)  Carbohydrates 
D)  Nucleic acids 
A)  Lipids 
B)  Proteins 
C)  Carbohydrates 
D)  Nucleic acids

Question 15

In humans, dental cavities form when Streptococcus mutans bacteria in the mouth hydrolyze sucrose. Which of the following is (are) the products of this reaction?

Accepted Answer

A)  Glucose and galactose 
B)  Glycogen 
C)  Starch 
D)  Glucose and fructose 
A)  Glucose and galactose 
B)  Glycogen 
C)  Starch 
D)  Glucose and fructose

Question 16

Maltose is made from

Accepted Answer

A)  two glucose molecules. 
B)  glucose and galactose. 
C)  two peptides. 
D)  glucose and fructose. 
A)  two glucose molecules. 
B)  glucose and galactose. 
C)  two peptides. 
D)  glucose and fructose.

Question 17

The fiber in your diet is actually

Accepted Answer

A)  protein. 
B)  glycogen. 
C)  ATP. 
D)  starch. 
E)  cellulose. 
A)  protein. 
B)  glycogen. 
C)  ATP. 
D)  starch. 
E)  cellulose.

Question 18

Complex, three- dimensional, tertiary structures of proteins result from

Accepted Answer

A)  hydrogen and disulfide bonds. 
B)  ionic bonds. 
C)  disulfide bonds. 
D)  ionic and hydrogen bonds 
E)  hydrogen bonds. 
A)  hydrogen and disulfide bonds. 
B)  ionic bonds. 
C)  disulfide bonds. 
D)  ionic and hydrogen bonds 
E)  hydrogen bonds.

Question 19

Explain how a saturated fat is structurally different from an unsaturated fat.

Accepted Answer

A saturated fat has three fatty acids th

Question 20

What maintains the secondary structure of a protein?

Accepted Answer

A)  Hydrogen bonds 
B)  Peptide bonds 
C)  Disulfide bonds 
D)  Ionic bonds 
A)  Hydrogen bonds 
B)  Peptide bonds 
C)  Disulfide bonds 
D)  Ionic bonds

Exam 3: Biological Molecules

Which of the following biological molecules possess large nonpolar regions, making them insoluble in water?

Which of the following statements about lipids is incorrect?

A peptide bond forms between which of these groups?

When the level of glucose in your blood is high, your body is able to store excess glucose in the liver by forming glycogen. When blood glucose levels fall, this stored glucose can be released. Based on this information, which of the following is TRUE?

What are some of the similarities and differences between DNA and RNA?

The "backbone" of a nucleic acid molecule is made of

Which of the following reactions is an example of dehydration synthesis?

Your classmate is trying to keep all the facts about biological molecules straight. He asks you to explain how amino acids and proteins are related. What do you tell him?

Which of the following refers to the amino acid sequence of proteins?

What type of chemical reaction results in the breakdown of organic polymers into their respective subunits?

Fats and oils are made of

Which of the following biological molecules are composed of monomer units containing a sugar, a phosphate group, and a nitrogen- containing base?

Which of the following can serve as an energy source and as structural support in plant cells?

In humans, dental cavities form when Streptococcus mutans bacteria in the mouth hydrolyze sucrose. Which of the following is (are) the products of this reaction?

Maltose is made from

The fiber in your diet is actually

Complex, three- dimensional, tertiary structures of proteins result from

Explain how a saturated fat is structurally different from an unsaturated fat.

What maintains the secondary structure of a protein?

An Introduction to Life on Earth

Atoms, Molecules, and Life

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity II: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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