Question 1

Molecules composed of two or more atoms are called compounds.

Accepted Answer

A) True 
 B)False

Question 2

The vibration of an ear drum is an example of __________ energy.

Accepted Answer

A)   kinetic
B)   potential
C)   elastic
D)   radiantE) C) and D)
F) B) and C)

Question 3

When table salt,sodium chloride (NaCl) ,is placed in water __________.

Accepted Answer

A)   Na+ and Cl- form ionic bonds with each other
B)   Na+ and Cl- form polar covalent bonds with each other
C)   Na+ and Cl- form hydrogen bonds with water
D)   Ionic bonds between Na+ and Cl- are broken
E)   Na+ and Cl- become separated by their Van der Waals forcesF) None of the above
G) A) and D)

Question 4

Which of these molecules is hydrophobic?

Accepted Answer

A)   Glucose
B)   Cholesterol
C)   Amino acid
D)   Protein
E)   DisaccharideF) C) and D)
G) B) and D)

Question 5

The pH of blood plasma is approximately 7.4,which is slightly acidic.

Accepted Answer

A) True 
 B)False

Question 6

Amylase is a digestive enzyme that breaks starches down into sugars through __________ reactions.

Accepted Answer

A)   hydrolysis
B)   dehydration synthesis
C)   anabolic
D)   endergonicE) B) and C)
F) A) and B)

Question 7

The folding and coiling of a protein into a globular shape is the __________ structure of the protein.

Accepted Answer

A)   primary
B)   secondary
C)   tertiary
D)   quaternary
E)   denaturedF) A) and E)
G) B) and E)

Question 8

Unsaturated fatty acids have as much hydrogen as they can carry.

Accepted Answer

A) True 
 B)False

Question 9

Sodium has an atomic number of 11 and an atomic mass of 23.Sodium has __________.

Accepted Answer

A)   12 neutrons and 11 protons
B)   12 protons and 11 neutrons
C)   12 electrons and 11 neutrons
D)   12 protons and 11 electrons
E)   12 electrons and 11 protonsF) A) and E)
G) B) and D)

Question 10

A drastic conformational change in a protein in response to extreme heat or pH is called __________.

Accepted Answer

A)   contamination
B)   denaturation
C)   saturation
D)   sedimentation
E)   deconformationF) C) and D)
G) A) and E)

Question 11

The breakdown of glucose to yield carbon dioxide,oxygen,and ATP can be described as __________.

Accepted Answer

A)   anabolic and endergonic
B)   catabolic and exergonic
C)   anabolic and exergonic
D)   catabolic and endergonic
E)   anabolic and exothermicF) B) and D)
G) A) and E)

Question 12

__________ is the substrate of __________.

Accepted Answer

A)   Glucose;lactose
B)   Lactase;glucose
C)   Lactose;lactase
D)   Galactose;lactose
E)   Sucrase;sucroseF) B) and D)
G) All of the above

Question 13

A __________ reaction breaks a __________ down into its monomers.

Accepted Answer

A)   hydrolysis;polymer
B)   dehydration synthesis;molecule
C)   dehydration synthesis;polymer
D)   polymer;molecule
E)   condensation;reactantF) A) and E)
G) A) and B)

Question 14

The chemical properties of an atom are determined by its __________.

Accepted Answer

A)   protons
B)   electrons
C)   neutrons
D)   protons and neutrons
E)   particlesF) A) and E)
G) A) and C)

Question 15

In general,__________ have a 2:1 ratio of hydrogen to oxygen.

Accepted Answer

A)   enzymes
B)   proteins
C)   lipids
D)   carbohydrates
E)   nucleic acidsF) A) and D)
G) A) and C)

Question 16

Oxygen has an atomic number of 8 and an atomic mass of 16.How many valence electrons does it have?

Accepted Answer

A)   2
B)   4
C)   6
D)   8
E)   16F) B) and D)
G) A) and C)

Question 17

Which one of the following would not increase the rate of a reaction?

Accepted Answer

A)   An increase in reactant concentrations
B)   A rise in temperature
C)   The presence of a catalyst
D)   The presence of an enzyme
E)   A decrease in reactant concentrationsF) A) and E)
G) B) and C)

Question 18

In an exchange reaction,covalent bonds are broken and new covalent bonds are formed.

Accepted Answer

A) True 
 B)False

Question 19

Which of these is the most appropriate to express the number of molecules per volume?

Accepted Answer

A)   Molarity
B)   Volume
C)   Percentage
D)   Weight per volume
E)   Milliequivalents per literF) A) and C)
G) C) and D)

Question 20

Which of these has the highest H+ concentration?

Accepted Answer

A)   Lemon juice,pH = 2.3
B)   Red wine,pH = 3.2
C)   Tomato juice,pH = 4.7
D)   Saliva,pH = 6.6
E)   Household ammonia,pH = 10.8F) None of the above
G) A) and B)

Exam 2: The Chemistry of Life

In general,__________ have a 2:1 ratio of hydrogen to oxygen.

Correct AnswerverifiedShow Answer

Which of these is the most appropriate to express the number of molecules per volume?

Correct AnswerverifiedShow Answer

A __________ reaction breaks a __________ down into its monomers.

Correct AnswerverifiedShow Answer

Unsaturated fatty acids have as much hydrogen as they can carry.

Correct AnswerverifiedShow Answer

The chemical properties of an atom are determined by its __________.

Correct AnswerverifiedShow Answer

Which of these molecules is hydrophobic?

Correct AnswerverifiedShow Answer

A drastic conformational change in a protein in response to extreme heat or pH is called __________.

Correct AnswerverifiedShow Answer

Molecules composed of two or more atoms are called compounds.

Correct AnswerverifiedShow Answer

Amylase is a digestive enzyme that breaks starches down into sugars through __________ reactions.

Correct AnswerverifiedShow Answer

__________ is the substrate of __________.

Correct AnswerverifiedShow Answer

Sodium has an atomic number of 11 and an atomic mass of 23.Sodium has __________.

Correct AnswerverifiedShow Answer

When table salt,sodium chloride (NaCl) ,is placed in water __________.

Correct AnswerverifiedShow Answer

Which of these has the highest H+ concentration?

Correct AnswerverifiedShow Answer

In an exchange reaction,covalent bonds are broken and new covalent bonds are formed.

Correct AnswerverifiedShow Answer

Oxygen has an atomic number of 8 and an atomic mass of 16.How many valence electrons does it have?

Correct AnswerverifiedShow Answer

The breakdown of glucose to yield carbon dioxide,oxygen,and ATP can be described as __________.

Correct AnswerverifiedShow Answer

The folding and coiling of a protein into a globular shape is the __________ structure of the protein.

Correct AnswerverifiedShow Answer

The pH of blood plasma is approximately 7.4,which is slightly acidic.

Correct AnswerverifiedShow Answer

The vibration of an ear drum is an example of __________ energy.

Correct AnswerverifiedShow Answer

Which one of the following would not increase the rate of a reaction?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

A reaction breaks a down into its monomers.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

is the substrate of .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of these has the highest H⁺ concentration?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified