Question 1

What category of compounds helps our body fluids to stay within a consistent pH range?

Accepted Answer

A)  solvents 
B)  buffers 
C)  solutes 
D)  acids 
E)  bases 
A)  solvents 
B)  buffers 
C)  solutes 
D)  acids 
E)  bases

Question 2

The secondary structure of proteins can be

Accepted Answer

A)  helical. 
B)  sheetlike. 
C)  globular. 
D)  fibrous. 
E)  both helical and sheet-like. 
A)  helical. 
B)  sheetlike. 
C)  globular. 
D)  fibrous. 
E)  both helical and sheet-like.

Question 3

Match the following letters to the number with which they best correspond.
-substance that can maintain the pH of a solution at a relatively constant level

Accepted Answer

A) Acid 
B) Base 
C) Neutral 
D) Buffer 
E) pH 
A) Acid 
B) Base 
C) Neutral 
D) Buffer 
E) pH

Question 4

Match the following letters to the number with which they best correspond.
-substance that accepts hydrogen ions in solution

Accepted Answer

A) Acid 
B) Base 
C) Neutral 
D) Buffer 
E) pH 
A) Acid 
B) Base 
C) Neutral 
D) Buffer 
E) pH

Question 5

Fats will dissolve in ethanol.Ethanol is an example of a

Accepted Answer

A)  solute 
B)  solution 
C)  solvent 
D)  salt 
E)  ion 
A)  solute 
B)  solution 
C)  solvent 
D)  salt 
E)  ion

Question 6

The positive subatomic particle is

Accepted Answer

A)  the neutron. 
B)  the proton. 
C)  the electron. 
D)  both the electron and the proton. 
E)  both the neutron and the electron. 
A)  the neutron. 
B)  the proton. 
C)  the electron. 
D)  both the electron and the proton. 
E)  both the neutron and the electron.

Question 7

Which of the following pHs is the most acidic?

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  7 
E)  9 
A)  1 
B)  3 
C)  5 
D)  7 
E)  9

Question 8

Which of the following is NOT a lipid?

Accepted Answer

A)  steroids 
B)  triglycerides 
C)  oils 
D)  waxes 
E)  monosaccharides 
A)  steroids 
B)  triglycerides 
C)  oils 
D)  waxes 
E)  monosaccharides

Question 9

What part does carbon play in the structure of biological molecules?

Accepted Answer

A)  carbon forms their backbone 
B)  carbon provides polarity 
C)  carbon makes it easier for them to be digested 
D)  carbon forms a bridge between two monomers 
E)  carbon plays no role whatsoever in the structure of biological molecules 
A)  carbon forms their backbone 
B)  carbon provides polarity 
C)  carbon makes it easier for them to be digested 
D)  carbon forms a bridge between two monomers 
E)  carbon plays no role whatsoever in the structure of biological molecules

Question 10

Nearly all of life's chemistry occurs near which of the following pHs?

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  7 
E)  9 
A)  1 
B)  3 
C)  5 
D)  7 
E)  9

Question 11

Classification.The following are types of chemical bonds.Answer the questions with reference to those chemical bonds.
-the bond in which electrons are shared

Accepted Answer

A) hydrogen 
B) ionic 
C) covalent 
A) hydrogen 
B) ionic 
C) covalent

Question 12

The breakdown of large molecules by the enzymes and with the addition of water is what kind of reaction?

Accepted Answer

A)  oxidation 
B)  reduction 
C)  condensation 
D)  hydrolysis 
E)  decarboxylation 
A)  oxidation 
B)  reduction 
C)  condensation 
D)  hydrolysis 
E)  decarboxylation

Question 13

Which of the following is an organic molecule?

Accepted Answer

A)  carbon dioxide (CO2) 
B)  water (H2O) 
C)  methane (CH4) 
D)  hydrochloric acid (HCl) 
E)  more than one of these is an organic molecule 
A)  carbon dioxide (CO2) 
B)  water (H2O) 
C)  methane (CH4) 
D)  hydrochloric acid (HCl) 
E)  more than one of these is an organic molecule

Question 14

What kind of bond exists between two amino acids in a protein?

Accepted Answer

A)  peptide 
B)  ionic 
C)  hydrogen 
D)  amino 
E)  sulfhydroxyl 
A)  peptide 
B)  ionic 
C)  hydrogen 
D)  amino 
E)  sulfhydroxyl

Question 15

Classification.The following are basic building blocks of macromolecules.Answer the questions with reference to those building blocks.
-the basic unit of starch

Accepted Answer

A) amino acids 
B) glucose 
C) glycerol 
D) fatty acids 
E) nucleotide
F)amino acids and glucose
G)amino acids and glycerol
H)glucose and glycerol
I)glucose and fatty acids
J)glycerol and fatty acids 
A) amino acids 
B) glucose 
C) glycerol 
D) fatty acids 
E) nucleotide
F)amino acids and glucose
G)amino acids and glycerol
H)glucose and glycerol
I)glucose and fatty acids
J)glycerol and fatty acids

Question 16

Which of the following is NOT true of hydrogen bonds?

Accepted Answer

A)  They are quite weak. 
B)  The hydrogen is slightly positive. 
C)  They are uncommon in macromolecules. 
D)  They form in salts such as NaCl. 
E)  They always involve hydrogen. 
A)  They are quite weak. 
B)  The hydrogen is slightly positive. 
C)  They are uncommon in macromolecules. 
D)  They form in salts such as NaCl. 
E)  They always involve hydrogen.

Question 17

In a cell membrane,the phospholipid heads are

Accepted Answer

A)  hydrophobic 
B)  nonpolar 
C)  dissolved in the cell's water 
D)  sandwiched between the phospholipid tails 
E)  formed by fatty acids 
A)  hydrophobic 
B)  nonpolar 
C)  dissolved in the cell's water 
D)  sandwiched between the phospholipid tails 
E)  formed by fatty acids

Question 18

An atom is in its most stable state when

Accepted Answer

A)  the number of electrons equals the number of protons. 
B)  the number of neutrons equals the number of protons plus number of electrons. 
C)  there are electron vacancies in the inner most shell. 
D)  there are no electron vacancies in the outer shell. 
E)  more than one of these is possible. 
A)  the number of electrons equals the number of protons. 
B)  the number of neutrons equals the number of protons plus number of electrons. 
C)  there are electron vacancies in the inner most shell. 
D)  there are no electron vacancies in the outer shell. 
E)  more than one of these is possible.

Question 19

Hydrophobic molecules are ____ water.

Accepted Answer

A)  attracted by 
B)  absorbed by 
C)  repelled by 
D)  mixed with 
E)  polarized by 
A)  attracted by 
B)  absorbed by 
C)  repelled by 
D)  mixed with 
E)  polarized by

Question 20

What are the monomers of carbohydrates?

Accepted Answer

A)  disaccharides 
B)  monosaccharides 
C)  fatty acids 
D)  amino acids 
E)  nucleotides 
A)  disaccharides 
B)  monosaccharides 
C)  fatty acids 
D)  amino acids 
E)  nucleotides

Exam 2: Molecules of Life

What category of compounds helps our body fluids to stay within a consistent pH range?

The secondary structure of proteins can be

Match the following letters to the number with which they best correspond. -substance that can maintain the pH of a solution at a relatively constant level

Match the following letters to the number with which they best correspond. -substance that accepts hydrogen ions in solution

Fats will dissolve in ethanol.Ethanol is an example of a

The positive subatomic particle is

Which of the following pHs is the most acidic?

Which of the following is NOT a lipid?

What part does carbon play in the structure of biological molecules?

Nearly all of life's chemistry occurs near which of the following pHs?

Classification.The following are types of chemical bonds.Answer the questions with reference to those chemical bonds. -the bond in which electrons are shared

The breakdown of large molecules by the enzymes and with the addition of water is what kind of reaction?

Which of the following is an organic molecule?

What kind of bond exists between two amino acids in a protein?

Classification.The following are basic building blocks of macromolecules.Answer the questions with reference to those building blocks. -the basic unit of starch

Which of the following is NOT true of hydrogen bonds?

In a cell membrane,the phospholipid heads are

An atom is in its most stable state when

Hydrophobic molecules are ____ water.

What are the monomers of carbohydrates?

Invitation to Biology

Cell Structure

Energy and Metabolism

Capturing and Releasing Energy

DNA Structure and Function

Gene Expression and Control

How Cells Reproduce

Patterns of Inheritance

Biotechnology

Evidence of Evolution

Processes of Evolution

Early Life Forms and the Viruses

Plants and Fungi

Animal Evolution

Population Ecology

Communities and Ecosystems

The Biosphere and Human Effects

Animal Tissues and Organs

How Animals Move

Circulation and Respiration

Immunity

Digestion and Excretion

Neural Control and the Senses

Endocrine Control

Reproduction and Development

Plant Form and Function

Plant Reproduction and Development

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