Self Quiz for Polypeptides and Proteins

Self Quiz for the Polypeptides and Proteins Tutorial

Study the material in this section and then write out the answers to these question.
Do not just click on the answers and write them out. This will not test your understanding of this tutorial.

1. Describe an amino acid and state what all amino acids have in common. (ans)

2. State what makes one amino acid different from another. (ans)

3. Describe how amino acids are joined by peptide bonds. (ans)

4. Compare the terms peptide, polypeptide, and protein. (ans)

5. Due to hydrogen bonds that form between the oxygen atom of one amino acid and the nitrogen atom of another, this gives the protein or polypeptide the two-dimensional form of an alpha-helix or a beta-pleated sheet. This best describes:

a. the primary structure of a protein (ans)
b. the secondary structure of a protein (ans)
c. the tertiary structure of a protein (ans)
d. the quaternary structure of a protein (ans)

6. In some cases, such as with antibody molecules and hemoglobin, several polypeptides may bond together to form a quaternary structure. This best describes:

a. the primary structure of a protein (ans)
b. the secondary structure of a protein (ans)
c. the tertiary structure of a protein (ans)
d. the quaternary structure of a protein (ans)

7. The actual order of the amino acids in the protein that is determined by DNA. This best describes:

a. the primary structure of a protein (ans)
b. the secondary structure of a protein (ans)
c. the tertiary structure of a protein (ans)
d. the quaternary structure of a protein (ans)

8. In globular proteins such as enzymes, the long chain of amino acids becomes folded into a three-dimensional functional shape. This is because certain amino acids with sulfhydryl or SH groups form disulfide (S-S) bonds with other amino acids in the same chain. Other interactions between R groups of amino acids such as hydrogen bonds, ionic bonds, covalent bonds, and hydrophobic interactions also contribute to this structure. This best describes:

a. the primary structure of a protein (ans)
b. the secondary structure of a protein (ans)
c. the tertiary structure of a protein (ans)
d. the quaternary structure of a protein (ans)

9. Define gene. (ans)

10. Describe how the order of nucleotide bases in DNA ultimately determines the final three-dimensional shape of a protein or polypeptide. (ans)

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