Question 1

How many different amino acids are there to choose from when assembling a protein?

Accepted Answer

A)   5
B)   10
C)   20
D)   25
E)   64

Question 2

The subunits (building blocks)  of proteins are

Accepted Answer

A)   nucleotides.
B)   phospholipids.
C)   amino acids.
D)   carbohydrates.
E)   monosaccharides.

Question 3

Which of the following is the correct order from most acidic to least acidic?

Accepted Answer

A)   Stomach acid, vinegar, unpolluted rainwater, blood, drain cleaner
B)   Drain cleaner, blood, unpolluted rainwater, vinegar, stomach acid
C)   Unpolluted rainwater, blood, vinegar, drain cleaner, stomach acid
D)   Stomach acid, drain cleaner, unpolluted rainwater, blood, vinegar
E)   Vinegar, blood, unpolluted rainwater, drain cleaner, stomach acid

Question 4

The atomic number for an atom of a specific element is equal to (Check all that apply)

Accepted Answer

A)   the number of electrons in a single atom of that element.
B)   the number of electrons plus neutrons in a single atom of that element.
C)   the number of protons in a single atom of that element.
D)   the number of neutrons and protons in a single atom of that element.
E)   the position of an ion on the periodic table.

Question 5

Which of the following pairs is mismatched?

Accepted Answer

A)   RNA - ribose sugar.
B)   Dehydration synthesis - water removal.
C)   Sharing electrons - covalent bond.
D)   Carboxyl - CH₃
E)   Lipids - hydrophobic.

Question 6

Which is NOT True of lipids?

Accepted Answer

A)   They are a major structural element of all cell membranes.
B)   They control the movement of molecules into and out of a cell.
C)   They separate a cell from its environment.
D)   Examples include steroids and phospholipids.
E)   They are a homogeneous group of molecules.

Question 7

Carbohydrates

Accepted Answer

A)   form only ring structures.
B)   form only linear structures.
C)   may interconvert between ring and linear structures.
D)   contain both ring and linear portions within the same molecule.
E)   are all structural isomers of each other.

Question 8

Sharing of electrons between 2 atoms forms a(n)

Accepted Answer

A)   hydrogen bond.
B)   ionic bond.
C)   covalence bond.
D)   atomic bond.
E)   covalent bond.

Question 9

Please identify the correct definition.

Accepted Answer

A)   Molecules that contain carbon and hydrogen are called inorganic compounds.
B)   Electrolytes are salts that conduct electricity when they are dissolved in water.
C)   A compound is a molecule composed of two or more identical elements.
D)   Electrons in a polar covalent bond are shared equally.
E)   The starting components of a chemical reaction are called products.

Question 10

The components of fats are fatty acids and

Accepted Answer

A)   amino acids.
B)   nucleotides.
C)   phosphate.
D)   glycerol.
E)   cholesterol.

Question 11

Unsaturated fats have lower melting points than saturated fats.

Accepted Answer

A) True 
 B)False

Question 12

D-amino acids are associated with

Accepted Answer

A)   radioactive isotopes.
B)   bacterial cell walls.
C)   plant proteins.
D)   human proteins.
E)   all proteins.

Question 13

As DNA is always double-stranded, RNA is always single-stranded.

Accepted Answer

A) True 
 B)False

Question 14

Weak bonds are important for the ________ structure of proteins.

Accepted Answer

A)   primary AND secondary
B)   primary, secondary, AND tertiary
C)   secondary, tertiary, AND quaternary
D)   primary, tertiary, AND quaternary
E)   quaternary

Question 15

The characteristic common to all lipids is their

Accepted Answer

A)   solubility in organic solvents AND hydrophilic nature.
B)   solubility in organic solvents AND hydrophobic nature.
C)   hydrophilic nature AND large size.
D)   large size AND solubility in water.
E)   hydrophobic nature AND solubility in water.

Question 16

Acidic or basic amino acids are

Accepted Answer

A)   insoluble in water.
B)   readily soluble in water.
C)   unable to form ions.
D)   considered hydrophobic.
E)   unable to form peptide bonds.

Question 17

Dan is a body builder. He decides that he is going to change his diet in an effort to increase his muscle mass. Dan tells you that he plans to eat vegetables and proteins but no fats or carbohydrates, because cells do not naturally contain these molecules and do not need them. You advise Dan that his new diet is not a good choice, and that he would do better to follow a well balanced diet that incorporates healthy amounts of proteins, fats AND carbohydrates.
-Dan tells you that he believes that proteins are the primary source of energy for his cells because proteins are easily digested. You tell him that this is

Accepted Answer

A) True 
 B)False

Question 18

Lipids are polar, hydrophilic molecules.

Accepted Answer

A) True 
 B)False

Question 19

Which statement is True of nucleotides?

Accepted Answer

A)   They are the building blocks of DNA.
B)   There are 20 naturally occurring nucleotides.
C)   They are joined together by peptide bonds.
D)   They are double-stranded.
E)   All of the answer choices are correct.

Question 20

The carbohydrate(s)  found in nucleic acids is (are)

Accepted Answer

A)   ribose OR deoxyribose.
B)   ribose OR glucose.
C)   glucose OR galactose.
D)   galactose OR deoxyribose.
E)   deoxyribose only.

Exam 2: The Molecules of Life

Which of the following pairs is mismatched?

Correct Answer
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How many different amino acids are there to choose from when assembling a protein?

Correct Answer
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Unsaturated fats have lower melting points than saturated fats.

Correct Answer
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As DNA is always double-stranded, RNA is always single-stranded.

Correct Answer
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Which is NOT True of lipids?

Correct Answer
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The subunits (building blocks) of proteins are

Correct Answer
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Lipids are polar, hydrophilic molecules.

Correct Answer
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Correct Answer
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Weak bonds are important for the ________ structure of proteins.

Correct Answer
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The characteristic common to all lipids is their

Correct Answer
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Sharing of electrons between 2 atoms forms a(n)

Correct Answer
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Acidic or basic amino acids are

Correct Answer
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Carbohydrates

Correct Answer
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The atomic number for an atom of a specific element is equal to (Check all that apply)

Correct Answer
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D-amino acids are associated with

Correct Answer
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Please identify the correct definition.

Correct Answer
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The carbohydrate(s) found in nucleic acids is (are)

Correct Answer
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Which of the following is the correct order from most acidic to least acidic?

Correct Answer
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Which statement is True of nucleotides?

Correct Answer
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The components of fats are fatty acids and

Correct Answer
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Exam 2: The Molecules of Life

Which of the following pairs is mismatched?

Correct AnswerverifiedShow Answer

How many different amino acids are there to choose from when assembling a protein?

Correct AnswerverifiedShow Answer

Unsaturated fats have lower melting points than saturated fats.

Correct AnswerverifiedShow Answer

As DNA is always double-stranded, RNA is always single-stranded.

Correct AnswerverifiedShow Answer

Which is NOT True of lipids?

Correct AnswerverifiedShow Answer

The subunits (building blocks) of proteins are

Correct AnswerverifiedShow Answer

Lipids are polar, hydrophilic molecules.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Weak bonds are important for the ________ structure of proteins.

Correct AnswerverifiedShow Answer

The characteristic common to all lipids is their

Correct AnswerverifiedShow Answer

Sharing of electrons between 2 atoms forms a(n)

Correct AnswerverifiedShow Answer

Acidic or basic amino acids are

Correct AnswerverifiedShow Answer

Carbohydrates

Correct AnswerverifiedShow Answer

The atomic number for an atom of a specific element is equal to (Check all that apply)

Correct AnswerverifiedShow Answer

D-amino acids are associated with

Correct AnswerverifiedShow Answer

Please identify the correct definition.

Correct AnswerverifiedShow Answer

The carbohydrate(s) found in nucleic acids is (are)

Correct AnswerverifiedShow Answer

Which of the following is the correct order from most acidic to least acidic?

Correct AnswerverifiedShow Answer

Which statement is True of nucleotides?

Correct AnswerverifiedShow Answer

The components of fats are fatty acids and

Correct AnswerverifiedShow Answer

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