Question 1

Which of the following would be classified as a polypeptide?

Accepted Answer

A)  1 amino acid
B)  3 amino acids bonded together
C)  9 fatty acids bonded together
D)  20 amino acids bonded togetherE) A) and C)
F) B) and C)

Question 2

What is the percent digestibility of most plant proteins?

Accepted Answer

A)  25-45
B)  50-65
C)  70-90
D)  95-99E) B) and D)
F) A) and C)

Question 3

All of the following are contained in an amino acid except

Accepted Answer

A)  an acid group.
B)  an amino group.
C)  an aldehyde group.
D)  a central carbon atom.E) B) and C)
F) A) and D)

Question 4

What is the structure of an enzyme?

Accepted Answer

A)  Lipid
B)  Protein
C)  Nucleic acid
D)  CarbohydrateE) B) and D)
F) All of the above

Question 5

In comparison to the well-defined structure of starch, which of the following is the most important factor that allows for the synthesis of thousands of different proteins?

Accepted Answer

A)  Number of cell ribosomes
B)  Number of different amino acids
C)  Availability of amino acids containing sulfur
D)  Availability of amino acids containing hydroxyl groupsE) A) and B)
F) A) and C)

Question 6

Which of the following describes the structure of an antibody?

Accepted Answer

A)  Tripeptide
B)  Small nucleic acid
C)  Huge protein molecule
D)  Large peptide moleculeE) A) and B)
F) None of the above

Question 7

What is the chief function of pepsin?

Accepted Answer

A)  Emulsifies dietary proteins
B)  Activates hydrochloric acid
C)  Activates pancreatic proteases
D)  Cleaves proteins into smaller polypeptidesE) B) and C)
F) A) and D)

Question 8

In the metabolism of amino acids for energy, what is the fate of the amino group?

Accepted Answer

A)  Excreted as urea
B)  Burned for energy
C)  Stored in the liver
D)  Converted to glucoseE) None of the above
F) A) and D)

Question 9

Which of the following describes the state of nitrogen balance for a normal, healthy 35-year-old person who weighs 60 kg and consumes a diet that provides 75 g of protein and adequate energy?

Accepted Answer

A)  Equilibrium
B)  Positive balance
C)  Negative balance
D)  Endogenous balanceE) None of the above
F) A) and B)

Question 10

What is an oligopeptide?

Accepted Answer

A)  A sulfur-containing amino acid
B)  A string of about 4-9 amino acids
C)  A carbohydrate-containing protein
D)  A protein containing only essential amino acidsE) A) and B)
F) B) and C)

Question 11

What type of reaction is required to bind two molecules of glycine together and release a molecule of water?

Accepted Answer

A)  Hydrolysis
B)  Deamination
C)  Denaturation
D)  CondensationE) B) and D)
F) B) and C)

Question 12

Your father, who has a high blood ammonia concentration, most likely has a poorly functioning

Accepted Answer

A)  liver.
B)  spleen.
C)  kidney.
D)  intestinal tract.E) A) and D)
F) A) and C)

Question 13

Which of the following is the primary factor that differentiates one amino acid from another?

Accepted Answer

A)  The side group
B)  The central carbon atom
C)  The number of oxygen atoms
D)  The number of nitrogen atomsE) B) and C)
F) All of the above

Question 14

What is the ratio of calcium to protein intake (mg to g)  for most U.S.women?

Accepted Answer

A)  3:1
B)  9:1
C)  15:1
D)  21:1E) A) and B)
F) A) and C)

Question 15

In kwashiorkor, the loss of hair color is indirectly related to

Accepted Answer

A)  inadequate intake of tyrosine.
B)  elevated levels of blood homocysteine.
C)  excessive exposure to the sun's UV rays.
D)  being nursed by a poorly-nourished mother.E) B) and D)
F) B) and C)

Question 16

What is the process by which heat or acidity disrupts the normal shape of a protein chain?

Accepted Answer

A)  Digestion
B)  Condensation
C)  Denaturation
D)  HydrogenationE) A) and B)
F) None of the above

Question 17

What is the usual fate of orally ingested enzyme supplements?

Accepted Answer

A)  Digested by gastrointestinal proteases
B)  Rapidly degraded by salivary secretions
C)  Mostly absorbed in original form from stomach
D)  Completely absorbed in original form from jejunumE) A) and D)
F) A) and C)

Question 18

Which of the following describes the structure of pepsin?

Accepted Answer

A)  Lipid
B)  Protein
C)  Nucleic acid
D)  CarbohydrateE) B) and C)
F) All of the above

Question 19

What is the most likely reason for a person to have abnormally high blood ammonia levels?

Accepted Answer

A)  Liver dysfunction
B)  Kidney dysfunction
C)  Protein intake twice the RDA
D)  Protein intake one-tenth the RDAE) All of the above
F) C) and D)

Question 20

When amino acids are deaminated, the immediate products are ammonia and often a

Accepted Answer

A)  uric acid.
B)  keto acid.
C)  folic acid.
D)  gluco acid.E) A) and B)
F) A) and C)

Exam 6: Protein: Amino Acids

Which of the following is the primary factor that differentiates one amino acid from another?

Correct AnswerverifiedShow Answer

What is an oligopeptide?

Correct AnswerverifiedShow Answer

Which of the following describes the structure of pepsin?

Correct AnswerverifiedShow Answer

In comparison to the well-defined structure of starch, which of the following is the most important factor that allows for the synthesis of thousands of different proteins?

Correct AnswerverifiedShow Answer

Your father, who has a high blood ammonia concentration, most likely has a poorly functioning

Correct AnswerverifiedShow Answer

What is the ratio of calcium to protein intake (mg to g) for most U.S.women?

Correct AnswerverifiedShow Answer

What is the percent digestibility of most plant proteins?

Correct AnswerverifiedShow Answer

What is the usual fate of orally ingested enzyme supplements?

Correct AnswerverifiedShow Answer

What type of reaction is required to bind two molecules of glycine together and release a molecule of water?

Correct AnswerverifiedShow Answer

Which of the following describes the structure of an antibody?

Correct AnswerverifiedShow Answer

All of the following are contained in an amino acid except

Correct AnswerverifiedShow Answer

Which of the following describes the state of nitrogen balance for a normal, healthy 35-year-old person who weighs 60 kg and consumes a diet that provides 75 g of protein and adequate energy?

Correct AnswerverifiedShow Answer

Which of the following would be classified as a polypeptide?

Correct AnswerverifiedShow Answer

What is the process by which heat or acidity disrupts the normal shape of a protein chain?

Correct AnswerverifiedShow Answer

In kwashiorkor, the loss of hair color is indirectly related to

Correct AnswerverifiedShow Answer

What is the chief function of pepsin?

Correct AnswerverifiedShow Answer

In the metabolism of amino acids for energy, what is the fate of the amino group?

Correct AnswerverifiedShow Answer

What is the structure of an enzyme?

Correct AnswerverifiedShow Answer

When amino acids are deaminated, the immediate products are ammonia and often a

Correct AnswerverifiedShow Answer

What is the most likely reason for a person to have abnormally high blood ammonia levels?

Correct AnswerverifiedShow Answer

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