Question 1

A molecule is

Accepted Answer

A)   a substance that conducts electricity when placed in solution.
B)   a positively charged ion.
C)   an alteration in the three-dimensional structure of a protein.
D)   a combination of atoms held together by chemical bonds.
E)   a negatively charged ion.F) C) and E)
G) C) and D)

Question 2

An organic molecule such as a vitamin that makes an enzyme functional is called a/an

Accepted Answer

A)   coenzyme.
B)   buffer.
C)   catalyst.
D)   coactivator.E) All of the above
F) A) and B)

Question 3

Which of the following factors will influence the rate of chemical reactions?

Accepted Answer

A)   temperature
B)   concentration of reactants
C)   presence of catalysts
D)   presence of enzymes
E)   All of these factors will influence the rate of chemical reactions.F) A) and E)
G) B) and E)

Question 4

Potential energy stored in bonds of molecules is _____ energy.

Accepted Answer

A)   mechanical
B)   thermal
C)   chemical
D)   molecular
E)   None of the aboveF) C) and E)
G) A) and B)

Question 5

The importance of O2 in the human body is to extract energy (ATP) from food molecules.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following chemical reactions best represents the synthesis of ATP?

Accepted Answer

A)   ATP + H2O  →\rightarrow→  ADP + Pi + energy
B)   ATP + energy  →\rightarrow→  ADP + H2O
C)   ADP + Pi + energy  →\rightarrow→  ATP + H2O
D)   ATP + ADP  →\rightarrow→ ATP
E)   ADP + ADP + ADP  →\rightarrow→ ATP + energy F) B) and C)
G) B) and E)

Question 7

Which of the following is a component of a nucleotide?

Accepted Answer

A)   adenine--a nitrogen base
B)   calcium ions
C)   cholesterol--a steroid
D)   ATP
E)   glucose--a monosaccharideF) A) and E)
G) B) and D)

Question 8

Glycogen is the

Accepted Answer

A)   storage carbohydrate in animals.
B)   storage carbohydrate in plants.
C)   sugar found in RNA.
D)   major nutrient for most body cells.
E)   nondigestible plant polysaccharide.F) B) and C)
G) B) and E)

Question 9

The primary structure of a protein is

Accepted Answer

A)   the hydrogen bonds between amino acids.
B)   the folded, helical nature of the molecule.
C)   represented by multiple polypeptide chains.
D)   the sequence of amino acids in the polypeptide chain.
E)   the number of polypeptide chains in the molecule.F) D) and E)
G) A) and B)

Question 10

What particle is formed when an acid loses a proton (H+) ?

Accepted Answer

A)   conjugate base
B)   buffer
C)   conjugate acid
D)   saltE) B) and D)
F) All of the above

Question 11

The mass of a chemical equal to its molecular weight in grams, containing 6.023 x 1023 molecules is a(n)

Accepted Answer

A)   atomic mass unit
B)   ion
C)   mole
D)   molarityE) None of the above
F) B) and D)

Question 12

Which of the following molecules is NOT made from cholesterol?

Accepted Answer

A)   testosterone
B)   progesterone
C)   bile salts
D)   estrogen
E)   prostaglandinsF) C) and E)
G) A) and D)

Question 13

Why is water involved in most metabolic reactions in the human body?

Accepted Answer

A)   It has a high surface tension.
B)   It is a solute.
C)   Its bonds are nonpolar.
D)   It can dissolve many chemical compounds.
E)   It can absorb and release heat without changing temperature very much.F) A) and B)
G) A) and C)

Question 14

All of the synthesis reactions in the body are called

Accepted Answer

A)   oxidation-reduction.
B)   hydrolysis.
C)   dissociation.
D)   anabolism.
E)   catabolism.F) A) and D)
G) A) and B)

Question 15

Synthesis reactions are also called catabolic reactions.

Accepted Answer

A) True 
 B)False

Question 16

-Phospholipids are important components of the plasma membrane. What does "B" represent on the diagram?

Accepted Answer

A)   phosphorus
B)   oxygen
C)   nitrogen
D)   polar (hydrophilic)  region
E)   nonpolar (hydrophobic)  regionF) A) and E)
G) C) and D)

Question 17

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of atom is found at "D"?

Accepted Answer

A)   oxygen atom
B)   water molecule
C)   polar covalent bond
D)   hydrogen atom
E)   hydrogen bondF) A) and B)
G) B) and D)

Question 18

A group of water molecules are held together by

Accepted Answer

A)   salt.
B)   double covalent bonds.
C)   polar covalent bonds.
D)   ionic bonds.
E)   hydrogen bonds.F) C) and D)
G) B) and D)

Question 19

Which of the following is a carbohydrate?

Accepted Answer

A)   animal fat
B)   triglyceride
C)   sucrose
D)   cholesterol
E)   hemoglobinF) All of the above
G) A) and D)

Question 20

Which of the following lists the components of a nucleotide?

Accepted Answer

A)   phosphate-sucrose-amino acid
B)   phosphate-lipid-organic base
C)   monosaccharide-organic base-sucrose
D)   monosaccharide-amino acid-phosphate
E)   phosphate-monosaccharide-organic baseF) A) and B)
G) All of the above

Exam 2: The Chemical Basis of Life

Which of the following molecules is NOT made from cholesterol?

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Which of the following factors will influence the rate of chemical reactions?

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Which of the following chemical reactions best represents the synthesis of ATP?

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All of the synthesis reactions in the body are called

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Which of the following is a component of a nucleotide?

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Which of the following lists the components of a nucleotide?

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An organic molecule such as a vitamin that makes an enzyme functional is called a/an

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Potential energy stored in bonds of molecules is _____ energy.

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A molecule is

Correct AnswerverifiedShow Answer

-Phospholipids are important components of the plasma membrane. What does "B" represent on the diagram?

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The primary structure of a protein is

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Which of the following is a carbohydrate?

Correct AnswerverifiedShow Answer

The importance of O2 in the human body is to extract energy (ATP) from food molecules.

Correct AnswerverifiedShow Answer

What particle is formed when an acid loses a proton (H+) ?

Correct AnswerverifiedShow Answer

Why is water involved in most metabolic reactions in the human body?

Correct AnswerverifiedShow Answer

Synthesis reactions are also called catabolic reactions.

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-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of atom is found at "D"?

Correct AnswerverifiedShow Answer

The mass of a chemical equal to its molecular weight in grams, containing 6.023 x 1023 molecules is a(n)

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A group of water molecules are held together by

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Glycogen is the

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The importance of O₂ in the human body is to extract energy (ATP) from food molecules.

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The mass of a chemical equal to its molecular weight in grams, containing 6.023 x 10²³ molecules is a(n)

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