Question 1

You would expect a peptide bond to link

Accepted Answer

A)  two simple sugars.
B)  two amino acids.
C)  two nucleotides.
D)  a sugar and a peptide.
E)  a peptide and a fatty acid.F) A) and E)
G) A) and B)

Question 2

Molecules with two fatty acid chains and a phosphate group that form biological membranes are called ________.

Accepted Answer

The answer of Molecules with two fatty acid chains and...

Question 3

Isotopes of an element differ in the number of

Accepted Answer

A)  protons in the nucleus.
B)  electrons in the nucleus.
C)  neutrons in the nucleus.
D)  electron clouds.
E)  electrons in energy shells.F) A) and D)
G) A) and E)

Question 4

The "atomic number" of an atom is determined by the number of ________ it has.

Accepted Answer

A)  electrons
B)  protons
C)  neutrons
D)  protons + neutrons
E)  protons + electronsF) C) and E)
G) A) and E)

Question 5

Each amino acid differs from another in the

Accepted Answer

A)  number of central carbon atoms.
B)  size of the amino group.
C)  number of carboxyl groups.
D)  nature of the side chain.
E)  number of peptide bonds in the molecule.F) None of the above
G) B) and E)

Question 6

The phosphorylation of adenosine forms

Accepted Answer

A)  ADP.
B)  ATP.
C)  AMP.
D)  2ATP.
E)  ribose.F) None of the above
G) C) and D)

Question 7

Which of the following statements about water is not correct?

Accepted Answer

A)  It is composed of polar molecules.
B)  It is responsible for much of the mass of the human body.
C)  It has a relatively low heat capacity.
D)  It can dissolve many substances.
E)  It contains hydrogen bonds.F) B) and C)
G) All of the above

Question 8

An important buffer in body fluids is

Accepted Answer

A)  NaCl.
B)  NaOH.
C)  HCl.
D)  NaHCO₃.
E)  H₂O.F) B) and C)
G) A) and B)

Question 9

Explain the role of water molecules in polysaccharide formation.

Accepted Answer

Water molecules are ...

Question 10

How would the lack of a cofactor for an enzyme affect that enzyme's function?

Accepted Answer

A)  The enzyme's function would not be altered.
B)  The enzyme would function more slowly.
C)  The enzyme would function more quickly.
D)  The enzyme would not be able to function.
E)  The enzyme would cease to function after reaching a maximum rate.F) B) and D)
G) A) and B)

Question 11

The term ________ means each enzyme catalyzes only one type of reaction.

Accepted Answer

A)  saturation
B)  specificity
C)  inertia
D)  activation
E)  monoreactiveF) A) and E)
G) C) and D)

Question 12

The alpha-helix and pleated sheet are examples of ________ protein structure.

Accepted Answer

A)  primary
B)  secondary
C)  tertiary
D)  quaternary
E)  pentanaryF) A) and C)
G) C) and D)

Question 13

The pyrimidine bases found in DNA are ________ and cytosine.

Accepted Answer

The answer of The pyrimidine bases found in DNA are...

Question 14

The molecule O₂ is known as

Accepted Answer

A)  oxide.
B)  oxygen.
C)  organic.
D)  oxate
E)  a saltF) A) and D)
G) C) and D)

Question 15

By weight,which element is the second most abundant in the human body?

Accepted Answer

A)  oxygen
B)  carbon
C)  hydrogen
D)  nitrogen
E)  calciumF) A) and E)
G) B) and E)

Question 16

Nonpolar organic molecules are good examples of

Accepted Answer

A)  electrolytes.
B)  molecules that will dissociate when placed into water.
C)  hydrophobic compounds.
D)  hydrophilic compounds.
E)  solutes.F) B) and D)
G) None of the above

Question 17

The ________ of a solution is the negative logarithm of the hydrogen ion concentration expressed in moles per liter.

Accepted Answer

The answer of The ________ of a solution is the...

Question 18

Which pH is closest to normal body pH?

Accepted Answer

A)  pH 7
B)  pH 8
C)  pH 4
D)  pH 3
E)  pH 2F) A) and C)
G) B) and D)

Question 19

Which pH of the following is the least acidic?

Accepted Answer

A)  pH 2
B)  pH 6
C)  pH 4
D)  pH 3
E)  pH 1F) All of the above
G) B) and E)

Question 20

Indicate which of these lists contains only trace elements.

Accepted Answer

A)  sulfur,chlorine,oxygen
B)  selenium,hydrogen,calcium
C)  boron,oxygen,carbon
D)  silicon,fluorine,tin
E)  cobalt,calcium,sodiumF) A) and E)
G) A) and D)

Exam 2: The Chemical Level of Organization

By weight,which element is the second most abundant in the human body?

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Which of the following statements about water is not correct?

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The ________ of a solution is the negative logarithm of the hydrogen ion concentration expressed in moles per liter.

Correct AnswerverifiedShow Answer

The alpha-helix and pleated sheet are examples of ________ protein structure.

Correct AnswerverifiedShow Answer

The phosphorylation of adenosine forms

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The "atomic number" of an atom is determined by the number of ________ it has.

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Nonpolar organic molecules are good examples of

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An important buffer in body fluids is

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Which pH of the following is the least acidic?

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Which pH is closest to normal body pH?

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Explain the role of water molecules in polysaccharide formation.

Correct AnswerverifiedWater molecules are ...View AnswerShow Answer

Each amino acid differs from another in the

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Indicate which of these lists contains only trace elements.

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You would expect a peptide bond to link

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The molecule O₂ is known as

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How would the lack of a cofactor for an enzyme affect that enzyme's function?

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Isotopes of an element differ in the number of

Correct AnswerverifiedShow Answer

The pyrimidine bases found in DNA are ________ and cytosine.

Correct AnswerverifiedShow Answer

The term ________ means each enzyme catalyzes only one type of reaction.

Correct AnswerverifiedShow Answer

Molecules with two fatty acid chains and a phosphate group that form biological membranes are called ________.

Correct AnswerverifiedShow Answer

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Water molecules are ...
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