Question 1

Which of the following statements regarding the triglyceride shown is correct? 3 is chiral. C) There are four enantiomers because C2 and C4 are chiral. D) There are six enantiomers because C2, C3, and C4 are chiral. E) There are six enantiomers because C1, C3, and C5 are chiral." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  There are no enantiomers because there are no chiral carbons.
B)  There are two enantiomers because C3 is chiral.
C)  There are four enantiomers because C2 and C4 are chiral.
D)  There are six enantiomers because C2, C3, and C4 are chiral.
E)  There are six enantiomers because C1, C3, and C5 are chiral.F) C) and D)
G) A) and C)

Question 2

Glucose is shown below.Number the carbon atoms 1-6 from top to bottom.In the cyclization reaction, a bond is formed to C1 by an oxygen lone pair on the OH bonded to 3. C) C4. D) C5. E) C6." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  C2.
B)  C3.
C)  C4.
D)  C5.
E)  C6.F) A) and B)
G) B) and E)

Question 3

Table sugar is

Accepted Answer

A)  glucose.
B)  lactose.
C)  a disaccharide of glucose and fructose.
D)  a glucose-glucose disaccharide.
E)  cellobiose.F) A) and D)
G) B) and E)

Question 4

The three-dimensional structure of a multi-subunit protein, including how the subunits fit together, is described by the term

Accepted Answer

A)  primary structure.
B)  secondary structure.
C)  tertiary structure.
D)  long-range structure.
E)  quaternary structure.F) B) and E)
G) None of the above

Question 5

Which of the following statements regarding fat substitutes is NOT correct?

Accepted Answer

A)  Fewer calories are available from fat substitutes.
B)  Fat substitutes must provide the taste, aroma, and mouth feel associated with lipid-rich food while being safe.
C)  Enzymes process chemically modified esters like olestra as well as natural triglycerides, but the turnover rate is slower.
D)  Enzymes cannot process chemically modified esters like olestra as they do natural triglycerides.
E)  Minor modifications to the glycerol scaffold in a glyceride can render a molecule indigestible.F) B) and C)
G) C) and E)

Question 6

A carbohydrate might have a molecular formula of

Accepted Answer

A)  CH2O.
B)  C6H12O6.
C)  C6H10O2.
D)  C2H4O2.
E)  C3H6O3.F) All of the above
G) A) and E)

Question 7

Lipids

Accepted Answer

A)  contain a carboxyl group.
B)  are typically insoluble in water.
C)  are esters of glycerol and fatty acids.
D)  are composed of carbon and hydrogen.
E)  are solids under normal conditions.F) D) and E)
G) A) and D)

Question 8

Which of the following is characteristic of a  β\betaβ -pleated sheet?

Accepted Answer

A)  Hydrogen bonds between -NH groups on one part of the chain and C=O groups on nearby amino acids cause the protein to fold up on itself with the amino acids' R groups pointing outward.
B)  Ion-ion interactions between side groups on different parts of the chain cause the protein to fold up on itself to forms sheets of amino acid chains.
C)  London forces between hydrophobic regions in the amino acid sequence cause the protein to fold up on itself in order to have hydrophilic regions of the chain point outward.
D)  Side-by-side zigzag chains of amino acids held together by hydrogen bonds aggregate to form a continuous sheet.
E)  Single-strand proteins form peptide linkages between chains that cause the chains to fold on top of one another, forming a continuous sheet. F) A) and C)
G) All of the above

Question 9

Aspartame exists as a zwitterion at physiological pH with a____ carboxylic group and a ____amine group.

Accepted Answer

A)  deprotonated; protonated
B)  protonated; deprotonated
C)  protonated; protonated
D)  deprotonated; deprotonated
E)  functionalized; defunctionalizedF) A) and B)
G) B) and E)

Question 10

Which of the following chemical formulas is probably that of a disaccharide?

Accepted Answer

A)  CH2O
B)  C6H10O5
C)  C12H22O11
D)  C2H4O2
E)  C3H6O3F) D) and E)
G) A) and D)

Question 11

The molecules drawn below are examples of

Accepted Answer

A)  glycerides.
B)  amino acids.
C)  carbohydroic acids.
D)  fatty acids.
E)  steroidal acids.F) A) and B)
G) B) and E)

Question 12

This molecule is a(n)

Accepted Answer

A)  lipid.
B)  fatty acid.
C)  amino acid.
D)  nucleic acid.
E)  saccharide.F) C) and D)
G) A) and C)

Question 13

Show how the bases pair in DNA.Use dashed lines to indicate intermolecular forces between atoms in each pair of bases.

Accepted Answer

The answer of Show how the bases pair in DNA.Use...

Question 14

Describe what is meant by the secondary structure of a protein.What types of intermolecular forces are involved?

Accepted Answer

The secondary structure refers...

Question 15

This molecule is a

Accepted Answer

A)  lipid.
B)  cis fatty acid.
C)  trans fatty acid.
D)  glyceride.
E)  saturated fatty acid.F) C) and E)
G) A) and C)

Question 16

Which biomolecules did Harold Urey and Stanley Miller produce in their experiments simulating the chemical reactions induced by lightning in Earth's prebiotic atmosphere?

Accepted Answer

The answer of Which biomolecules did Harold Urey and Stanley...

Question 17

In water, glucose forms a ____-member ring and fructose forms a ____-member ring.

Accepted Answer

The answer of In water, glucose forms a ____-member ring...

Question 18

Two dipeptides can be produced from the amino acids glycine and alanine.Draw and name each structure.Assume a physiological pH of 7.4.The R groups are H for glycine and CH3 for alanine.

Accepted Answer

Note: the N terminus...

Question 19

At a physiological pH of 7.4, amino acids exist as zwitterions.At a very low pH( in an acid solution) , both the amine group and the carboxylic acid group on an amino acid are protonated.Therefore, the following must be true: the pKa of the ___group is larger than the pKa of the ____group.

Accepted Answer

A)  protonated amine group; carboxylic acid group
B)  carboxylic acid group; protonated amine group
C)  amine group; carbonate group
D)  hydronium ion group; hydroxyl ion group
E)  carbonate group; amine groupF) A) and B)
G) C) and D)

Question 20

Which of the following is NOT categorized as a lipid?

Accepted Answer

A)  fatty acid esters
B)  cholesterol
C)  fats
D)  cellulose
E)  oilsF) A) and B)
G) B) and C)

Exam 20: Biochemistry the Compounds of Life

Which of the following chemical formulas is probably that of a disaccharide?

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In water, glucose forms a ____-member ring and fructose forms a ____-member ring.

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A carbohydrate might have a molecular formula of

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Describe what is meant by the secondary structure of a protein.What types of intermolecular forces are involved?

Correct AnswerverifiedThe secondary structure refers...View AnswerShow Answer

Which of the following is NOT categorized as a lipid?

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The three-dimensional structure of a multi-subunit protein, including how the subunits fit together, is described by the term

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Aspartame exists as a zwitterion at physiological pH with a____ carboxylic group and a ____amine group.

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Which of the following statements regarding the triglyceride shown is correct?

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Which of the following statements regarding fat substitutes is NOT correct?

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The molecules drawn below are examples of

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Two dipeptides can be produced from the amino acids glycine and alanine.Draw and name each structure.Assume a physiological pH of 7.4.The R groups are H for glycine and CH3 for alanine.

Correct AnswerverifiedNote: the N terminus...View AnswerShow Answer

This molecule is a(n)

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This molecule is a

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Which biomolecules did Harold Urey and Stanley Miller produce in their experiments simulating the chemical reactions induced by lightning in Earth's prebiotic atmosphere?

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Which of the following is characteristic of a β\betaβ -pleated sheet?

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Lipids

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Glucose is shown below.Number the carbon atoms 1-6 from top to bottom.In the cyclization reaction, a bond is formed to C1 by an oxygen lone pair on the OH bonded to

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At a physiological pH of 7.4, amino acids exist as zwitterions.At a very low pH( in an acid solution) , both the amine group and the carboxylic acid group on an amino acid are protonated.Therefore, the following must be true: the pKa of the ___group is larger than the pKa of the ____group.

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Table sugar is

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Show how the bases pair in DNA.Use dashed lines to indicate intermolecular forces between atoms in each pair of bases.

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In water, glucose forms a -member ring and fructose forms a -member ring.

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The secondary structure refers...
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Aspartame exists as a zwitterion at physiological pH with a carboxylic group and a amine group.

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Two dipeptides can be produced from the amino acids glycine and alanine.Draw and name each structure.Assume a physiological pH of 7.4.The R groups are H for glycine and CH₃ for alanine.

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Note: the N terminus...
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Which of the following is characteristic of a $\beta$ -pleated sheet?

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At a physiological pH of 7.4, amino acids exist as zwitterions.At a very low pH( in an acid solution) , both the amine group and the carboxylic acid group on an amino acid are protonated.Therefore, the following must be true: the pK_a of the ___group is larger than the pK_a of the ____group.

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