Question 1

Which of the following is an example of a polar covalent bond?

Accepted Answer

A) H2 
B) H2O 
C) O2 
D) the bond between separate water molecules 
E) H2 and H2O 
A) H2 
B) H2O 
C) O2 
D) the bond between separate water molecules 
E) H2 and H2O B

Question 2

A process by which cells build large molecules from monomers is

Accepted Answer

A) hydrolysis. 
B) reproduction. 
C) dehydration synthesis. 
D) hydrolysis and dehydration synthesis. 
E) unrelated to chemical bonds. 
A) hydrolysis. 
B) reproduction. 
C) dehydration synthesis. 
D) hydrolysis and dehydration synthesis. 
E) unrelated to chemical bonds. C

Question 3

The second energy shell of an atom contains a maximum of

Accepted Answer

A) eight electrons. 
B) two electrons. 
C) four electrons. 
D) one electron. 
E) sixteen electrons. 
A) eight electrons. 
B) two electrons. 
C) four electrons. 
D) one electron. 
E) sixteen electrons. A

Question 4

Evaporation is

Accepted Answer

A) the conversion of a liquid into a vapor. 
B) the conversion of a solid into a vapor. 
C) the conversion of a vapor into a liquid. 
D) the conversion of a vapor into a soliD. 
E) All answers are correct. 
A) the conversion of a liquid into a vapor. 
B) the conversion of a solid into a vapor. 
C) the conversion of a vapor into a liquid. 
D) the conversion of a vapor into a soliD. 
E) All answers are correct.

Question 5

Organic molecules are defined as chemical compounds that contain

Accepted Answer

A) hydrophilic solutions. 
B) isotopes of carbon. 
C) ionically bonded atoms. 
D) strong hydrogen bonds. 
E) carbon and hydrogen. 
A) hydrophilic solutions. 
B) isotopes of carbon. 
C) ionically bonded atoms. 
D) strong hydrogen bonds. 
E) carbon and hydrogen.

Question 6

A substance with a pH of 6 is

Accepted Answer

A) a weak acid. 
B) neutral. 
C) a weak base. 
D) a strong aciD. 
E) a strong basE. 
A) a weak acid. 
B) neutral. 
C) a weak base. 
D) a strong aciD. 
E) a strong basE.

Question 7

The primary function of hemoglobin is to regulate the level of sugar in the blood.

Accepted Answer

A) True 
 B)False

Question 8

14C and 14N are both

Accepted Answer

A) atoms. 
B) molecules. 
C) compounds. 
D) polymers. 
E) ions. 
A) atoms. 
B) molecules. 
C) compounds. 
D) polymers. 
E) ions.

Question 9

The four nitrogenous bases found in RNA are

Accepted Answer

A) glycerol,phosphate,adenine,and glucose. 
B) adenine,cytosine,guanine,and uracil. 
C) adenine,thymine,cytosine,and uracil. 
D) thymine,cytosine,guanine,and uracil. 
E) adenine,thymine,guanine,and cytosinE. 
A) glycerol,phosphate,adenine,and glucose. 
B) adenine,cytosine,guanine,and uracil. 
C) adenine,thymine,cytosine,and uracil. 
D) thymine,cytosine,guanine,and uracil. 
E) adenine,thymine,guanine,and cytosinE.

Question 10

The most common isotope of carbon is 12C.14C has ____ than 12C.

Accepted Answer

A) more protons 
B) more neutrons 
C) fewer neutrons 
D) fewer protons 
E) more electrons 
A) more protons 
B) more neutrons 
C) fewer neutrons 
D) fewer protons 
E) more electrons

Question 11

In the example of ionic bond formation between sodium and chlorine

Accepted Answer

A) Na is the chemical symbol for chlorine. 
B) sodium accepts an electron. 
C) chlorine accepts an electron. 
D) chlorine becomes positively chargeD. 
E) both sodium and chlorine accept electrons. 
A) Na is the chemical symbol for chlorine. 
B) sodium accepts an electron. 
C) chlorine accepts an electron. 
D) chlorine becomes positively chargeD. 
E) both sodium and chlorine accept electrons.

Question 12

How are the monomers in nucleic acids joined?

Accepted Answer

A) peptide bonds between carbohydrates 
B) peptide bonds between amino acids 
C) phosphodiester bonds between amino acids 
D) peptide bonds between nucleotides 
E) phosphodiester bonds between nucleotides 
A) peptide bonds between carbohydrates 
B) peptide bonds between amino acids 
C) phosphodiester bonds between amino acids 
D) peptide bonds between nucleotides 
E) phosphodiester bonds between nucleotides

Question 13

A process by which cells break polymers down into smaller units is

Accepted Answer

A) hydrolysis. 
B) dehydration synthesis. 
C) reproduction. 
D) hydrolysis and dehydration synthesis. 
E) unrelated to chemical bonds. 
A) hydrolysis. 
B) dehydration synthesis. 
C) reproduction. 
D) hydrolysis and dehydration synthesis. 
E) unrelated to chemical bonds.

Question 14

Ice floats on liquid water because

Accepted Answer

A) the molecules are closer together in ice than in liquid water. 
B) the molecules are farther apart in ice than in liquid water. 
C) ice is denser than liquid water. 
D) convection currents caused by temperature differences push upwards on the ice. 
E) water vapor is less dense than liquid water. 
A) the molecules are closer together in ice than in liquid water. 
B) the molecules are farther apart in ice than in liquid water. 
C) ice is denser than liquid water. 
D) convection currents caused by temperature differences push upwards on the ice. 
E) water vapor is less dense than liquid water.

Question 15

A peptide bond is a covalent bond formed between amino acids.

Accepted Answer

A) True 
 B)False

Question 16

The atomic number of an atom or element is

Accepted Answer

A) the number of neutrons in the nucleus. 
B) the number of electrons in the nucleus. 
C) the number of protons in the nucleus. 
D) the number of neutrons in the orbitals. 
E) the number of protons in the orbitals. 
A) the number of neutrons in the nucleus. 
B) the number of electrons in the nucleus. 
C) the number of protons in the nucleus. 
D) the number of neutrons in the orbitals. 
E) the number of protons in the orbitals.

Question 17

A hydrogen bond

Accepted Answer

A) is generally a strong bond. 
B) does not occur in living organisms. 
C) does not require electron transfer. 
D) forms between atoms having the same electronegativity. 
E) is a specialized type of covalent bond. 
A) is generally a strong bond. 
B) does not occur in living organisms. 
C) does not require electron transfer. 
D) forms between atoms having the same electronegativity. 
E) is a specialized type of covalent bond.

Question 18

Human blood,saliva,tears,bile,and urine are close to neutral.Why is human stomach acid very acidic?

Accepted Answer

A) It must break down eaten polymers into monomers. 
B) It is not acidic in the stomach,but rather strongly basic. 
C) To stomach acid will absorb excess H+ in the stomach. 
D) The stomach acids will add OH- to help digest fooD. 
E) The stomach acid neutralizes H+ and OH- from the consumed foods. 
A) It must break down eaten polymers into monomers. 
B) It is not acidic in the stomach,but rather strongly basic. 
C) To stomach acid will absorb excess H+ in the stomach. 
D) The stomach acids will add OH- to help digest fooD. 
E) The stomach acid neutralizes H+ and OH- from the consumed foods.

Question 19

An acid

Accepted Answer

A) has a value above seven on the pH scale. 
B) is a chemical that takes hydrogen ions from a solution. 
C) has a value of seven on the pH scale. 
D) is a chemical that adds hydrogen ions to a solution. 
E) All answers are correct. 
A) has a value above seven on the pH scale. 
B) is a chemical that takes hydrogen ions from a solution. 
C) has a value of seven on the pH scale. 
D) is a chemical that adds hydrogen ions to a solution. 
E) All answers are correct.

Question 20

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Accepted Answer

A) also the main elements in organic molecules. 
B) rare in non-human organisms. 
C) rare on Earth. 
D) always bonded by hydrogen bonds. 
E) All answers are correct. 
A) also the main elements in organic molecules. 
B) rare in non-human organisms. 
C) rare on Earth. 
D) always bonded by hydrogen bonds. 
E) All answers are correct.

Exam 2: The Chemistry of Life

Which of the following is an example of a polar covalent bond?

A process by which cells build large molecules from monomers is

The second energy shell of an atom contains a maximum of

Evaporation is

Organic molecules are defined as chemical compounds that contain

A substance with a pH of 6 is

The primary function of hemoglobin is to regulate the level of sugar in the blood.

14C and 14N are both

The four nitrogenous bases found in RNA are

The most common isotope of carbon is 12C.14C has ____ than 12C.

In the example of ionic bond formation between sodium and chlorine

How are the monomers in nucleic acids joined?

A process by which cells break polymers down into smaller units is

Ice floats on liquid water because

A peptide bond is a covalent bond formed between amino acids.

The atomic number of an atom or element is

A hydrogen bond

Human blood,saliva,tears,bile,and urine are close to neutral.Why is human stomach acid very acidic?

An acid

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Scientific Study of Life

Cells

The Energy of Life

Photosynthesis

How Cells Release Energy

DNA Structure and Gene Function

DNA Replication and Cell Division

Sexual Reproduction and Meiosis

Patterns of Inheritance

DNA Technology

Forces of Evolutionary Change

Evidence of Evolution

Speciation and Extinction

Evolution and Diversity of Microbial Life

Evolution and Diversity of Plants

Evolution and Diversity of Animals

Population Ecology

Communities and Ecosystems

Preserving Biodiversity

Plant Form and Function

Reproduction and Development of Flowering Plants

Animal Tissues and Organ Systems

Nervous System and the Senses

The Endocrine System

The Skeletal and Muscular Systems

The Circulatory and Respiratory Systems

Regulating Temperature, nutrients, and Body Fluids

The Immune System

Animal Reproduction and Development

Filters

¹⁴C and ¹⁴N are both

The most common isotope of carbon is ¹²C.¹⁴C has ____ than ¹²C.