BIOCHEM MODULE 3 EXAM
1. True or False
The amino acids lysine and arginine both contain sulfur atoms.-
Answer False
2. True or False
The following secondary structure shown below is an example of a beta-turn.
Answer False
3. True or False. The side chain of histidine is bonded to the backbone nitrogen
atom.
False
4. True or False
The name of the molecule that binds to an enzyme is called the ligand.
Answer False
5. True or False
An inhibitor that binds at the active site is a coenzyme.
1/
26
, Answer False
6. Which amino acids both have an R group (side chain) with an -OH functional
group?
Answer Ser and Thr
7. The formation of a peptide bond between two amino acids is an example of
a(n) reaction.
Answer Condensation
8. The peptide Ala-Glu-Gly-Ala-Leu has .
Answer Four peptide bonds
9. Formally, when there are 100 or more amino acids are covalently linked
together that is called a .
Answer Protein
10. What unit is used by biochemists to indicate the mass of a protein?
Answer Da
11. All of the 20 standard amino acids contain an R-group that is attached to the
2/
26
, A) α carbon
B) Carboxyl group
C) Amino group
D) β carbon
E) None of the above
Answer A
12. Which of the following correctly matches the amino acid with its one letter
abbreviation?
Answer Glutamic acid, E
13. The order of amino acids in a protein is written .
Answer N to C-terminus
14. Roughly how many amino acids are there in one turn of an alpha helix?
Answer 3.6
15. In an alpha helix, the R groups on the amino acid residues
Answer Are found on the outside of the helix spiral
3/
26
1. True or False
The amino acids lysine and arginine both contain sulfur atoms.-
Answer False
2. True or False
The following secondary structure shown below is an example of a beta-turn.
Answer False
3. True or False. The side chain of histidine is bonded to the backbone nitrogen
atom.
False
4. True or False
The name of the molecule that binds to an enzyme is called the ligand.
Answer False
5. True or False
An inhibitor that binds at the active site is a coenzyme.
1/
26
, Answer False
6. Which amino acids both have an R group (side chain) with an -OH functional
group?
Answer Ser and Thr
7. The formation of a peptide bond between two amino acids is an example of
a(n) reaction.
Answer Condensation
8. The peptide Ala-Glu-Gly-Ala-Leu has .
Answer Four peptide bonds
9. Formally, when there are 100 or more amino acids are covalently linked
together that is called a .
Answer Protein
10. What unit is used by biochemists to indicate the mass of a protein?
Answer Da
11. All of the 20 standard amino acids contain an R-group that is attached to the
2/
26
, A) α carbon
B) Carboxyl group
C) Amino group
D) β carbon
E) None of the above
Answer A
12. Which of the following correctly matches the amino acid with its one letter
abbreviation?
Answer Glutamic acid, E
13. The order of amino acids in a protein is written .
Answer N to C-terminus
14. Roughly how many amino acids are there in one turn of an alpha helix?
Answer 3.6
15. In an alpha helix, the R groups on the amino acid residues
Answer Are found on the outside of the helix spiral
3/
26
