Question 1

Phospholipids are found in cell membranes.

Accepted Answer

A) True 
 B)False  True

Question 2

The strongest possible chemical link between two atoms is a(n)

Accepted Answer

A) covalent bond. 
B) hydrogen bond. 
C) noncovalent bond. 
D) ionic bond. 
A) covalent bond. 
B) hydrogen bond. 
C) noncovalent bond. 
D) ionic bond. A

Question 3

Which of the following is not a role of fatty acids in living organisms?

Accepted Answer

A) energy storage 
B) storage of genetic information 
C) membrane construction 
D) building blocks of fats 
A) energy storage 
B) storage of genetic information 
C) membrane construction 
D) building blocks of fats B

Question 4

A molecule composed of amino acids is a

Accepted Answer

A) nucleotide. 
B) lipid. 
C) carbohydrate. 
D) protein. 
A) nucleotide. 
B) lipid. 
C) carbohydrate. 
D) protein.

Question 5

A solution with a pH of 7 is neither acidic nor basic.

Accepted Answer

A) True 
 B)False

Question 6

ATP is a universal fuel for living organisms. The energy that ATP molecules deliver in chemical reactions is stored in

Accepted Answer

A) covalent bonds between the molecule's phosphate groups. 
B) covalent bonds between the molecule's sugar and phosphate groups. 
C) hydrogen bonds between the bases of two of these molecules. 
D) ionic bonds between the molecule's sugar and base. 
A) covalent bonds between the molecule's phosphate groups. 
B) covalent bonds between the molecule's sugar and phosphate groups. 
C) hydrogen bonds between the bases of two of these molecules. 
D) ionic bonds between the molecule's sugar and base.

Question 7

Nucleotides

Accepted Answer

A) are the building blocks of proteins. 
B) are involved in every chemical reaction in the cell. 
C) form physical structures such as hair. 
D) are the building blocks of nucleic acids. 
A) are the building blocks of proteins. 
B) are involved in every chemical reaction in the cell. 
C) form physical structures such as hair. 
D) are the building blocks of nucleic acids.

Question 8

The chemical reaction that represents the combustion of glucose is C₆H₁₂O₆ + O₂ → CO₂ + H₂O; _____ are the reactants.

Accepted Answer

A) CO₂ and H₂O 
B) O₂ and H₂O 
C) C6H12O6 and O₂ 
D) C6H12O6 and CO₂ 
A) CO₂ and H₂O 
B) O₂ and H₂O 
C) C6H12O6 and O₂ 
D) C6H12O6 and CO₂

Question 9

In the illustration below, a positive ion is surrounded by water molecules.  
The water molecules orient as shown because the slightly _____ in the water molecules are attracted to the positive charge of the ion.

Accepted Answer

A) negative hydrogen atoms 
B) positive hydrogen atoms 
C) negative oxygen atoms 
D) positive oxygen atoms 
A) negative hydrogen atoms 
B) positive hydrogen atoms 
C) negative oxygen atoms 
D) positive oxygen atoms

Question 10

The number that represents neutrality on the pH scale is ____________________.

Accepted Answer

The answer of The number that represents neutrality on the...

Question 11

The figure below shows two hydrogen atoms.  
How many covalent bonds will form between these two atoms?

Accepted Answer

A) one 
B) two 
C) three 
D) none, these atoms will form an ionic bond. 
A) one 
B) two 
C) three 
D) none, these atoms will form an ionic bond.

Question 12

In addition to cardiovascular complication trans fats have recently been suggested as a contributing factor in ____________________.

Accepted Answer

The answer of In addition to cardiovascular complication trans fats...

Question 13

Cholesterol is commonly found in the cell membranes of warm-blooded animals because

Accepted Answer

A) excess dietary cholesterol is stored in cell membranes. 
B) cholesterol is involved in the muscle contractions needed to move an animal around its environment. 
C) it prevents the cell membrane from becoming too flexible at body temperature. 
D) warm-blooded animals tend to consume large amounts of cholesterol-rich foods. 
A) excess dietary cholesterol is stored in cell membranes. 
B) cholesterol is involved in the muscle contractions needed to move an animal around its environment. 
C) it prevents the cell membrane from becoming too flexible at body temperature. 
D) warm-blooded animals tend to consume large amounts of cholesterol-rich foods.

Question 14

Nonpolar molecules are highly charged.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following levels of protein structure involves more than one polypeptide chain?

Accepted Answer

A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure 
A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure

Question 16

Macromolecules are typically formed by repetitively adding small monomers together; which macromolecule is properly matched with the appropriate monomer?

Accepted Answer

A) polypeptide-amino acid 
B) nucleic acid-amino acid 
C) polysaccharide-nucleotide 
D) triglyceride-cholesterol 
A) polypeptide-amino acid 
B) nucleic acid-amino acid 
C) polysaccharide-nucleotide 
D) triglyceride-cholesterol

Question 17

Steroids and proteins are different types of lipids.

Accepted Answer

A) True 
 B)False

Question 18

The predominant atom in living systems is ____________________.

Accepted Answer

The answer of The predominant atom in living systems is...

Question 19

Pure water has a pH of 7. The inside of a cell is also about pH 7. This might be so because

Accepted Answer

A) buffers work best when the pH is close to 7. 
B) humans are largely made up of water by weight. 
C) most of the chemical reactions that occur in humans can proceed optimally at pH 7. 
D) ionic bonds cannot form at pH 7. 
A) buffers work best when the pH is close to 7. 
B) humans are largely made up of water by weight. 
C) most of the chemical reactions that occur in humans can proceed optimally at pH 7. 
D) ionic bonds cannot form at pH 7.

Question 20

In the equation 3H₂ + N₂ → 2NH₃, how many molecules of hydrogen gas (H₂)are present?

Accepted Answer

A) 2 
B) 3 
C) 6 
D) 12 
A) 2 
B) 3 
C) 6 
D) 12

Exam 5: The Chemistry of Life

Phospholipids are found in cell membranes.

The strongest possible chemical link between two atoms is a(n)

Which of the following is not a role of fatty acids in living organisms?

A molecule composed of amino acids is a

A solution with a pH of 7 is neither acidic nor basic.

ATP is a universal fuel for living organisms. The energy that ATP molecules deliver in chemical reactions is stored in

Nucleotides

The chemical reaction that represents the combustion of glucose is C₆H₁₂O₆ + O₂ → CO₂ + H₂O; _____ are the reactants.

In the illustration below, a positive ion is surrounded by water molecules. The water molecules orient as shown because the slightly _____ in the water molecules are attracted to the positive charge of the ion.

The number that represents neutrality on the pH scale is ____________________.

The figure below shows two hydrogen atoms. How many covalent bonds will form between these two atoms?

In addition to cardiovascular complication trans fats have recently been suggested as a contributing factor in ____________________.

Cholesterol is commonly found in the cell membranes of warm-blooded animals because

Nonpolar molecules are highly charged.

Which of the following levels of protein structure involves more than one polypeptide chain?

Macromolecules are typically formed by repetitively adding small monomers together; which macromolecule is properly matched with the appropriate monomer?

Steroids and proteins are different types of lipids.

The predominant atom in living systems is ____________________.

Pure water has a pH of 7. The inside of a cell is also about pH 7. This might be so because

In the equation 3H₂ + N₂ → 2NH₃, how many molecules of hydrogen gas (H₂)are present?

The Nature of Science and the Characteristics of Life

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Stem Cells, Cancer, and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

Dna and Genes

From Gene to Protein

Dna Technology

How Evolution Works

Evolution of Populations

Speciation and the Origins of Biological Diversity

The Evolutionary History of Life

The Biosphere

Growth of Populations

Ecological Communities

Ecosystems

Global Change

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons, Muscles, and Movement

Defenses Against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

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