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Exam 20: Proteins

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Question 1

Multiple Choice

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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 methyl group attached to its alpha carbon atom

A) proline
B) cysteine
C) glycine
D) alanine

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Question 2

Multiple Choice

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How do the standard amino acids differ from one another?

A) in whether or not the amino group is chiral
B) in whether or not the carboxyl group is chiral
C) in the number of chiral carbon atoms between the carboxyl group and the amino group
D) in the identity of the R group (side chain)

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Question 3

Multiple Choice

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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 denaturation

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) In a peptide, the number of amino acids and the number of peptide bonds are always equal. (2) HDL and LDL are examples of lipoproteins. (3) Tertiary structure interactions in proteins always involve amino acid R groups.

A total of six isomeric tetrapeptides can be made from which of the following combinations of amino acids?

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) Some tertiary-structure interactions involve covalent bonding. (2) Nonpolar amino acids contain one amino group, one carboxyl group, and a nonpolar side chain. (3) The two amino acids present in a dipeptide are linked via an amide linkage.

Which of the following statements concerning proteins is correct?

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 different amino acids produced by complete hydrolysis

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. -Sequence of amino acids in a protein chain

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. -Positively-charged form

Which of the following statements concerning proteins is incorrect?

The non-amino acid portion of a conjugated protein is called a

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) Partial hydrolysis of the tripeptide Ala-Gly-Cys produces three different dipeptides. (2) The number of standard amino acids is 23. (3) Enkephalins are peptides that bind at receptor sites in the brain to reduce pain.

Parallel polypeptide chains in a beta-pleated sheet conformation are held together by

Which of the following sets of elements is a possible composition for a standard amino acid?

Which of the following tripeptides is a possible product from the partial hydrolysis of Ala-Val-Gly-Gly-Ala-Val?

Which of the following elements is present in some of the standard amino acids but not all of them?

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) In pure form, amino acids are white crystalline solids with limited solubility in water. (2) In an alpha-helix structure, all of the amino acid side chains lie outside the helix. (3) Protein denaturation affects all four levels of protein structure.

Which of the following statements concerning the tripeptide Val-Ala-Gly is correct?

The joining together of two amino acids to form a dipeptide involves the reaction between