Question 1

Which of the following lists the components of a nucleotide?

Accepted Answer

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

Question 2

The building blocks of proteins are

Accepted Answer

A)   triglycerides.
B)   phospholipids.
C)   amino acids.
D)   monosaccharides.
E)   eicosanoids.F) B) and E)
G) C) and D)

Question 3

What is the building block molecule of a protein?

Accepted Answer

A)   amino acid
B)   nucleic acid
C)   monosaccharide
D)   glycerol
E)   fatty acidF) B) and D)
G) All of the above

Question 4

The primary structure of a protein is

Accepted Answer

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

Question 5

An atom has an atomic number of 19 and a mass number of 39. This atom will have

Accepted Answer

A)   19 neutrons.
B)   20 neutrons.
C)   39 neutrons.
D)   58 neutrons.
E)   20 electrons.F) B) and D)
G) A) and B)

Question 6

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

Question 7

Which of the following is the correct complementary strand to CATGTC?

Accepted Answer

A)   GTACAG
B)   CATGTC
C)   GUACAG
D)   AGCACA
E)   TCGTATF) B) and C)
G) All of the above

Question 8

Solubility refers to the ability of one substance to ___________ in another.

Accepted Answer

A)   react
B)   dissolve
C)   precipitate
D)   conduct
E)   None of these choices are correct.F) B) and C)
G) D) and E)

Question 9

The mass number of an atom is the number of

Accepted Answer

A)   protons in the atom.
B)   neutrons in the atom.
C)   protons plus electrons in the atom.
D)   electrons plus neutrons in the atom.
E)   neutrons plus protons in the atom.F) A) and D)
G) A) and E)

Question 10

All of the following terms relate to lipids. Which does not belong with the other four?

Accepted Answer

A)   cholesterol
B)   estrogen
C)   steroid
D)   triglyceride
E)   bile saltsF) B) and C)
G) C) and D)

Question 11

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

Accepted Answer

A)   buffer.
B)   coactivator.
C)   catalyst.
D)   coenzyme.E) None of the above
F) B) and D)

Question 12

An enzyme

Accepted Answer

A)   has a two-dimensional shape.
B)   is permanently changed in a chemical reaction.
C)   increases the activation energy needed in a chemical reaction.
D)   is a protein catalyst.
E)   cannot be denatured.F) A) and B)
G) A) and E)

Question 13

Which of the following statements best describes RNA?

Accepted Answer

A)   RNA is found outside a cell.
B)   RNA contains the base thymine.
C)   RNA is a single-stranded molecule.
D)   RNA molecules are antiparallel.
E)   RNA is a double helix.F) C) and D)
G) A) and D)

Question 14

Which of the following is NOT a possible product of a nuclear reaction to form a more stable nucleus?

Accepted Answer

A)   gamma ray
B)   alpha particle
C)   X-ray
D)   beta particleE) A) and C)
F) A) and D)

Question 15

ATP

Accepted Answer

A)   can be synthesized from ADP.
B)   stores and releases energy in the cell.
C)   is associated with a reversible reaction.
D)   is associated with anabolism and catabolism.
E)   All of these choices are correct.F) B) and D)
G) B) and C)

Question 16

Substances dissolved in the liquid portion of a solution are called

Accepted Answer

A)   solutes.
B)   solvents.
C)   catalysts.
D)   osmoles.
E)   insoluble.F) A) and B)
G) C) and D)

Question 17

Which of the following is the correct sequence from largest to smallest?

Accepted Answer

A)   amino acid, cell, protein, atom
B)   amino acid, atom, cell, protein
C)   cell, protein, amino acid, atom
D)   atom, amino acid, protein, cell
E)   protein, cell, amino acid, atomF) D) and E)
G) All of the above

Question 18

-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) A) and C)
G) A) and E)

Question 19

-The sodium chloride molecule breaks apart in water. What does "B" represent?

Accepted Answer

A)   chloride ion
B)   dissociation
C)   water molecule
D)   sodium ion
E)   salt crystalF) A) and E)
G) A) and D)

Question 20

Why are cyanide compounds lethal to humans?

Accepted Answer

A)   They interfere with protein synthesis.
B)   They interfere with nerve impulses.
C)   They interfere with the production of ATP.
D)   They interfere with muscle contraction.
E)   All of these occur with cyanide poisoning.F) A) and B)
G) All of the above

Exam 2: The Chemical Basis of Life

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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An enzyme

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All of the following terms relate to lipids. Which does not belong with the other four?

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Substances dissolved in the liquid portion of a solution are called

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Which of the following is NOT a possible product of a nuclear reaction to form a more stable nucleus?

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The mass number of an atom is the number of

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Which of the following statements best describes RNA?

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Lipids

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-The sodium chloride molecule breaks apart in water. What does "B" represent?

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Which of the following is the correct complementary strand to CATGTC?

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The building blocks of proteins are

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ATP

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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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Solubility refers to the ability of one substance to ___________ in another.

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The primary structure of a protein is

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An atom has an atomic number of 19 and a mass number of 39. This atom will have

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Why are cyanide compounds lethal to humans?

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Which of the following is the correct sequence from largest to smallest?

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What is the building block molecule of a protein?

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