Question 1

Which of the following molecules is NOT made from cholesterol?

Accepted Answer

A)   Estrogen
B)   Bile salts
C)   Testosterone
D)   Prostaglandins
E)   ProgesteroneF) B) and C)
G) A) and B)

Question 2

Lipids

Accepted Answer

A)   can insulate and help prevent heat loss.
B)   yield little energy per unit of weight.
C)   function as enzymes.
D)   are all water soluble.
E)   comprise the genetic material of cells.F) All of the above
G) A) and B)

Question 3

The presence of water in our bodies allows us to

Accepted Answer

A)   cool the body with sweat.
B)   maintain a fairly constant body temperature.
C)   provide an environment for chemical reactions.
D)   keep tissues moist and reduce friction.
E)   All of the choices are correct.F) A) and E)
G) B) and E)

Question 4

Which of the following is a source of nitrogen for the body?

Accepted Answer

A)   Carbohydrates
B)   Water
C)   Proteins
D)   Glucose
E)   LipidsF) D) and E)
G) A) and C)

Question 5

In the following reaction, what is/are the product(s) ? CO2 + H2O ---> H2CO3

Accepted Answer

A)   H2CO3
B)   CO2 and H2O
C)   CO2 and H2CO3
D)   H2O and H2CO3E) B) and C)
F) A) and C)

Question 6

Which of the following is not an example of an important inorganic substance necessary for normal human physiology?

Accepted Answer

A)   Iodide ions are important components of certain hormones in the body.
B)   The sugar-phosphate backbone of DNA form from covalent bonds between nucleotides.
C)   Calcium ions are important components of cellular communication.
D)   Oxygen is the final electron acceptor in cellular respiration, the process that generates much of the ATP in cells.E) A) and B)
F) B) and D)

Question 7

-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 "C"?

Accepted Answer

A)   Hydrogen bond
B)   Water molecule
C)   Oxygen atom
D)   Hydrogen atom
E)   Polar covalent bondF) None of the above
G) B) and C)

Question 8

Which of the following is determined by the sequence of amino acids bound by peptide bonds?

Accepted Answer

A)   Amino acid
B)   Peptide bond
C)   Primary structure of protein
D)   Secondary structure of protein
E)   DenaturationF) A) and C)
G) A) and B)

Question 9

The model that helps explain how an enzyme works is the ________ model.

Accepted Answer

A)   activation
B)   lock-and-key
C)   three-dimensional
D)   denaturationE) B) and C)
F) A) and B)

Question 10

Which protein structure results from folding or coiling of a polypeptide chain caused by hydrogen bonds between amino acids?

Accepted Answer

A)   Quaternary structure
B)   Tertiary structure
C)   Secondary structure
D)   Primary structure
E)   Peptide structureF) A) and E)
G) A) and B)

Question 11

Which of the following lists the components of a nucleotide?

Accepted Answer

A)   Phosphate, lipid, nitrogenous base
B)   Monosaccharide, nitrogenous base, sucrose
C)   Phosphate, monosaccharide, nitrogenous base
D)   Phosphate, sucrose, amino acid
E)   Monosaccharide, amino acid, phosphateF) A) and C)
G) All of the above

Question 12

If the potential energy in the chemical bonds of the reactants is greater than the potential energy in the chemical bonds of the product,

Accepted Answer

A)   energy must be supplied for the reaction to occur.
B)   energy is released by the reaction.
C)   the chemical reaction equalizes the potential energy levels.
D)   energy has not been gained or lost.
E)   energy is not a factor in the reaction.F) A) and E)
G) A) and B)

Question 13

Normal pH for blood is 7.35 to 7.45. Maintenance of the pH in this range is

Accepted Answer

A)   critical because enzymes work best within narrow ranges of pH.
B)   not critical because extreme pH values do not affect enzyme function.
C)   called denaturation.
D)   not required.
E)   None of the choices are correct.F) A) and B)
G) B) and C)

Question 14

-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 C)
G) C) and D)

Question 15

If you were able to sort nucleotides into DNA nucleotides and RNA nucleotides, which component of the nucleotide would you use to do so?

Accepted Answer

A)   Pentose sugar
B)   Phosphate group
C)   Nitrogenous basesD) All of the above
E) B) and C)

Question 16

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

Question 17

Carbon dioxide is considered a/an ________.

Accepted Answer

A)   molecule
B)   compound
C)   Both molecule and compound are correct.
D)   element
E)   ionF) All of the above
G) C) and E)

Question 18

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

Accepted Answer

A)   ATP + H2O → ADP + Pi + energy
B)   ADP + Pi + energy → ATP + H2O
C)   ADP + ADP + ADP →ATP + energy
D)   ATP + energy → ADP + H2O
E)   ATP + ADP → ATPF) A) and D)
G) A) and E)

Question 19

Intermolecular forces are weak electrostatic attractions that exist between

Accepted Answer

A)   two molecules.
B)   two atoms.
C)   two protons.D) A) and B)
E) None of the above

Question 20

An organic molecule consists of carbon, hydrogen, oxygen, nitrogen, and sulfur; the molecule is probably

Accepted Answer

A)   carbon dioxide.
B)   an amino acid.
C)   a triglyceride (fat) .
D)   a monosaccharide.
E)   a phospholipid.F) A) and B)
G) B) and E)

Exam 2: The Chemical Basis of Life

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

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Which protein structure results from folding or coiling of a polypeptide chain caused by hydrogen bonds between amino acids?

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Intermolecular forces are weak electrostatic attractions that exist between

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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 "C"?

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If the potential energy in the chemical bonds of the reactants is greater than the potential energy in the chemical bonds of the product,

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Lipids

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Which of the following is a source of nitrogen for the body?

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If you were able to sort nucleotides into DNA nucleotides and RNA nucleotides, which component of the nucleotide would you use to do so?

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Which of the following molecules is NOT made from cholesterol?

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Which of the following is not an example of an important inorganic substance necessary for normal human physiology?

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The model that helps explain how an enzyme works is the ________ model.

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Normal pH for blood is 7.35 to 7.45. Maintenance of the pH in this range is

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Which of the following is determined by the sequence of amino acids bound by peptide bonds?

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

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An organic molecule consists of carbon, hydrogen, oxygen, nitrogen, and sulfur; the molecule is probably

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In the following reaction, what is/are the product(s) ? CO2 + H2O ---> H2CO3

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Which of the following lists the components of a nucleotide?

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Carbon dioxide is considered a/an ________.

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

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The presence of water in our bodies allows us to

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In the following reaction, what is/are the product(s) ? CO₂ + H₂O ---> H₂CO₃

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