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Peptides Quiz
1. What is a peptide?
2. What type of reaction forms a peptide?
a) single replacement
b) redox
c) decomposition
d) condensation
3. What is the –CO-N− group called?
a) carboxylamine group
b) amide group
c) carbino group
d) peptide group
4. A molecule with one peptide bond is called a _____.
a) monopeptide
b) dipeptide
c) protein
d) diamino acid
5. The identity of the side chains of the amino acids influences the peptide bond.
a) True
b) False
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Questions 6 and 7: Given the amino acid sequence represented by Ala-Gly-Cys
6. Which amino acid of the sequence contains a free carboxyl group?
a) alanine
b) glycine
c) cysteine
d) All of the amino acids have a free carboxyl group.
7. Which amino acid of the sequence contains a free amino group?
a) alanine
b) glycine
c) cysteine
d) All of the amino acids have a free amino group.
8. How many peptide bonds are there in the amino acid sequence Gln-Arg-Ser-Val?
a) two
b) three
c) four
d) five
9. Draw the structural formula for the dipeptide with the sequence Trp-Ala.
10. Consider the amino acid sequences Leu-Asp-His and His-Asp-Leu. Are the structures of
the two sequences identical? Explain.
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