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Exam 20: Proteins

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Question 31

Multiple Choice

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In which of the following pairs of proteins are both members of the pair fibrous proteins?

A) alpha-keratin and collagen
B) collagen and hemoglobin
C) hemoglobin and myoglobin
D) more than one correct response
E) no correct response

F) A) and E)
G) A) and C)

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Question 32

Multiple Choice

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Proteins are polymers in which:

A) Unbranched chains of amino acids are present.
B) Branched chains of amino acids are present.
C) Both unbranched and branched chains of amino acids are present.
D) Alternating amino acid and glucose monomer units are present.

E) None of the above
F) A) and B)

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Question 33

Multiple Choice

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The complete hydrolysis of a protein produces a mixture of

Use the following to answer the questions below: Use the response list to answer the following questions concerning the pentapeptide Gly-Ala-Gly-Gly-Ala. Responses may be used more than once or need not be used at all. -Number of peptide linkages present

Use the following to answer the questions below: In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: -Statements: (1) For a tripeptide in which the three amino acids are different, six isomeric forms are possible. (2) The "backbone" of a protein is an alternating sequence of C and N atoms. (3) Both alpha-helix and beta-pleated sheet configurations can be present in the same protein.

Which of the following biochemically important small peptides functions as an antioxidant?

Use the following to answer the questions below: Determine the structural level (primary, secondary, etc.) associated with each of the protein characteristics using the response list. Responses may be used more than once or need not be used at all. -Three-dimensional shape resulting from R-group interactions

Use the following to answer the questions below: In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: -Statements: (1) The antirejection drug cyclosporine is structurally a small cyclic peptide. (2) The chemical basis for a hair permanent is reversible denaturation in which peptide linkages are broken and reformed. (3) Immature human milk (colostrum) does not contain protein.

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid that participates in disulfide bonds

Which of the following forms of the amino acid alanine (Ala) is the zwitterion form of this amino acid?

Interactions between amino acid R groups is responsible for which of the following levels of protein structure?

Use the following to answer the questions below: Use the response list to answer the following questions concerning the pentapeptide Gly-Ala-Gly-Gly-Ala. Responses may be used more than once or need not be used at all. -Number of possible different tripeptides produced by partial hydrolysis

In a solution that is highly acidic (low pH) , which of the following forms of the amino acid alanine (Ala) would predominate?

Use the following to answer the questions below: Aspartic acid, an acidic amino acid, can have four different forms in solution. These four forms are given in the response list. For each of the conditions or characterizations, select from the response list the form of aspartic acid that will be dominant. Responses may be used more than once or need not be used at all. -Zwitterion form

Which of the following levels of protein structure is not disrupted when protein hydrolysis occurs?

Which of the following is an incorrect characterization for the protein hemoglobin?

Use the following to answer the questions below: Aspartic acid, an acidic amino acid, can have four different forms in solution. These four forms are given in the response list. For each of the conditions or characterizations, select from the response list the form of aspartic acid that will be dominant. Responses may be used more than once or need not be used at all. -Form in a solution of pH 1

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid with a cyclic side chain

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid that is achiral

Use the following to answer the questions below: Aspartic acid, an acidic amino acid, can have four different forms in solution. These four forms are given in the response list. For each of the conditions or characterizations, select from the response list the form of aspartic acid that will be dominant. Responses may be used more than once or need not be used at all. -Form in a solution of pH 13