Question 1

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) None of the above
G) A) and B)

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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) A) and E)
G) A) and D)

Question 4

Which of the following is a carbohydrate?

Accepted Answer

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

Question 5

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) A) and B)
G) C) and D)

Question 6

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 7

-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) None of the above
G) A) and D)

Question 8

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) C) and E)

Question 9

Synthesis reactions are also called catabolic reactions.

Accepted Answer

A) True 
 B)False

Question 10

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 D)
G) C) and E)

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) A) and B)
F) A) and C)

Question 12

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) B) and D)
F) B) and C)

Question 13

-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) C) and D)
G) A) and D)

Question 14

Which of the following molecules is NOT made from cholesterol?

Accepted Answer

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

Question 15

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 B)
G) C) and D)

Question 16

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

Accepted Answer

A)   conjugate base
B)   buffer
C)   conjugate acid
D)   saltE) A) and B)
F) A) and C)

Question 17

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) C) and E)
G) B) and D)

Question 18

Potential energy stored in bonds of molecules is _____ energy.

Accepted Answer

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

Question 19

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) B) and E)
G) All of the above

Question 20

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) C) and D)
G) B) and E)

Exam 2: The Chemical Basis of Life

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

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All of the synthesis reactions in the body are called

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Glycogen is the

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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

Which of the following is a component of a nucleotide?

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

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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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Which of the following molecules is NOT made from cholesterol?

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

Correct AnswerverifiedShow Answer

A group of water molecules are held together by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is a carbohydrate?

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Potential energy stored in bonds of molecules is _____ energy.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Synthesis reactions are also called catabolic reactions.

Correct AnswerverifiedShow Answer

Which of the following lists the components of a nucleotide?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The primary structure of a protein is

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A molecule is

Correct AnswerverifiedShow Answer

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

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