Question 1

Because both the wood in a tree branch and the spider's exoskeleton are composed of low-density cellulose,each floats when placed in water.

Accepted Answer

A) True 
 B)False  False

Question 2

The following figure shows the chemical structure and space-filling models for stearic acid and oleic acid.
   
The reason oleic acid is slightly bent (as compared to stearic acid)is that it contains a ________ between two of its carbon atoms.

Accepted Answer

double bond

Question 3

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. D

Question 4

All the isotopes of a particular element have the same number of protons.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is NOT a function of cholesterol?

Accepted Answer

A)  Cholesterol is converted into other important molecules like steroid hormones. 
B)  Cholesterol is converted into a vitamin important in the growth and maintenance of bone and muscle. 
C)  Cholesterol is a necessary component in the cell membranes of plants. 
D)  A derivative of cholesterol aids in the digestion of fats. 
A)  Cholesterol is converted into other important molecules like steroid hormones. 
B)  Cholesterol is converted into a vitamin important in the growth and maintenance of bone and muscle. 
C)  Cholesterol is a necessary component in the cell membranes of plants. 
D)  A derivative of cholesterol aids in the digestion of fats.

Question 6

In the equation 3H2 + N2 $\rarr$ 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

Question 7

The most abundant protein found in animals is actinomyosin.

Accepted Answer

A) True 
 B)False

Question 8

The chemical reaction that represents the combustion of glucose is C6H12O6 + O2 $\rarr$
CO2 + H2O + E;the reactants are

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

The atoms in water molecules are held together by hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 10

Examine the following illustration,a representation of a sodium ion with a charge of +1.Based on the information provided,determine the proton number for this atom.

Accepted Answer

A)  8 
B)  9 
C)  10 
D)  11 
A)  8 
B)  9 
C)  10 
D)  11

Question 11

Molecules with an uneven distribution of charge are described as ________.

Accepted Answer

The answer of Molecules with an uneven distribution of charge...

Question 12

Lipids with a four-ring structure are called ________.

Accepted Answer

The answer of Lipids with a four-ring structure are called...

Question 13

A group of monomers bonded together form a ________.

Accepted Answer

The answer of A group of monomers bonded together form...

Question 14

Both trans fats and saturated fats have been linked to comparable groups of undesirable health complications.What do the two types of molecules share in common that may account for the similarity in their health impacts?

Accepted Answer

A)  Both molecules form solid assemblies at body temperature and clog small blood vessels. 
B)  Both molecules are rich in hydrogen that can easily form hydrogen ions and lower the pH to harmful values. 
C)  Both molecules are linear;for reasons not currently understood,linear fatty acids appear to be more difficult to metabolize and have high biological activities. 
D)  Both molecules are rapidly converted to signal molecules called prostaglandins,creating discordant signaling within the body. 
A)  Both molecules form solid assemblies at body temperature and clog small blood vessels. 
B)  Both molecules are rich in hydrogen that can easily form hydrogen ions and lower the pH to harmful values. 
C)  Both molecules are linear;for reasons not currently understood,linear fatty acids appear to be more difficult to metabolize and have high biological activities. 
D)  Both molecules are rapidly converted to signal molecules called prostaglandins,creating discordant signaling within the body.

Question 15

Radioisotopes are useful in scientific research and medicine because they

Accepted Answer

A)  have a different number of protons than other isotopes of the same element. 
B)  give off high-energy radiation that can be detected by film and specialized scanning machines. 
C)  have the same atomic mass as other isotopes of the same element. 
D)  have a different number of electrons than other isotopes of the same element. 
A)  have a different number of protons than other isotopes of the same element. 
B)  give off high-energy radiation that can be detected by film and specialized scanning machines. 
C)  have the same atomic mass as other isotopes of the same element. 
D)  have a different number of electrons than other isotopes of the same element.

Question 16

A solution with a pH of ________ is ________ times more acidic than a solution with a pH of ________.

Accepted Answer

A)  3;10,000;7 
B)  12;100;10 
C)  7;1,000;9 
D)  4;10;3 
A)  3;10,000;7 
B)  12;100;10 
C)  7;1,000;9 
D)  4;10;3

Question 17

Which of the following combinations of atoms would form ionic bonds?

Accepted Answer

A)  H+ and O 
B)  Na+ and K+ 
C)  Na+ and Cl+ 
D)  PO41-and I2- 
A)  H+ and O 
B)  Na+ and K+ 
C)  Na+ and Cl+ 
D)  PO41-and I2-

Question 18

O2,also termed atmospheric oxygen,is considered to be a molecule but not a compound;why not?

Accepted Answer

A)  It contains no covalent bonds. 
B)  It contains a double covalent bond but not a single covalent bond. 
C)  To be considered a compound,there must be a minimum of three atoms;atmospheric oxygen is too small. 
D)  Compounds are defined as molecules constructed from two or more different elements. 
A)  It contains no covalent bonds. 
B)  It contains a double covalent bond but not a single covalent bond. 
C)  To be considered a compound,there must be a minimum of three atoms;atmospheric oxygen is too small. 
D)  Compounds are defined as molecules constructed from two or more different elements.

Question 19

The types of proteins that speed up the rate of chemical reactions in the cell are called ________.

Accepted Answer

The answer of The types of proteins that speed up...

Question 20

How many atoms are present in a single molecule of C8H10N4O2?

Accepted Answer

A)  4 
B)  8 
C)  12 
D)  24 
A)  4 
B)  8 
C)  12 
D)  24

Exam 2: The Chemistry of Life

Because both the wood in a tree branch and the spider's exoskeleton are composed of low-density cellulose,each floats when placed in water.

The following figure shows the chemical structure and space-filling models for stearic acid and oleic acid. The reason oleic acid is slightly bent (as compared to stearic acid)is that it contains a ________ between two of its carbon atoms.

Nucleotides

All the isotopes of a particular element have the same number of protons.

Which of the following is NOT a function of cholesterol?

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

The most abundant protein found in animals is actinomyosin.

The chemical reaction that represents the combustion of glucose is C6H12O6 + O2 →\rarr→ CO2 + H2O + E;the reactants are

The atoms in water molecules are held together by hydrogen bonds.

Examine the following illustration,a representation of a sodium ion with a charge of +1.Based on the information provided,determine the proton number for this atom.

Molecules with an uneven distribution of charge are described as ________.

Lipids with a four-ring structure are called ________.

A group of monomers bonded together form a ________.

Both trans fats and saturated fats have been linked to comparable groups of undesirable health complications.What do the two types of molecules share in common that may account for the similarity in their health impacts?

Radioisotopes are useful in scientific research and medicine because they

A solution with a pH of ________ is ________ times more acidic than a solution with a pH of ________.

Which of the following combinations of atoms would form ionic bonds?

O2,also termed atmospheric oxygen,is considered to be a molecule but not a compound;why not?

The types of proteins that speed up the rate of chemical reactions in the cell are called ________.

How many atoms are present in a single molecule of C8H10N4O2?

The Nature of Science and the Characteristics of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

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

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

Filters

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

The chemical reaction that represents the combustion of glucose is C₆H₁₂O₆ + O₂ $\rarr$ CO₂ + H₂O + E;the reactants are

A solution with a pH of is times more acidic than a solution with a pH of .

O₂,also termed atmospheric oxygen,is considered to be a molecule but not a compound;why not?

How many atoms are present in a single molecule of C₈H₁₀N₄O₂?