Biochem Module 3 Exam questions and answers 2024\2025
A+ Grade
T/F: The amino acids lysine and arginine both contain sulfur atoms.
- correct answer False
*only cysteine and methionine contain sulfur
T/F: The amino acids serine and methionine both contain sulfur atoms.
- correct answer False
*serine does not, but methionine does
T/F: The following secondary structure shown below is an example of a beta-turn.
- correct answer False
T/F: The side chain of histidine is bonded to the backbone nitrogen atom.
- correct answer False
*proline, not histidine
T/F: The side chain of proline is bonded to the backbone nitrogen atom.
- correct answer True
T/F: The name of the molecule that binds to an enzyme is called the apoenzyme.
- correct answer False
*substrate, not apoenzyme
, T/F: The name of the molecule that binds to an enzyme is called the ligand.
- correct answer False
*substrate, not ligand
T/F: An inhibitor that binds at the active site is an uncompetitive inhibitor.
- correct answer False
*competitive inhibitor, not an uncompetitive inhibitor
T/F: An inhibitor that binds at the active site is a coenzyme.
- correct answer False
*competitive inhibitor, not a coenzyme
Which amino acids differ by only one atom?
A) Ser and Thr
B) Leu and Ile
C) Ala and Ser
D) Asp and Asn
E) Ser and Cys
- correct answer E) Ser and Cys
*serine has an -OH group where cysteine has an -SH group
Which amino acids both have an R group (side chain) with an -OH functional group?
A) Ser and Thr
A+ Grade
T/F: The amino acids lysine and arginine both contain sulfur atoms.
- correct answer False
*only cysteine and methionine contain sulfur
T/F: The amino acids serine and methionine both contain sulfur atoms.
- correct answer False
*serine does not, but methionine does
T/F: The following secondary structure shown below is an example of a beta-turn.
- correct answer False
T/F: The side chain of histidine is bonded to the backbone nitrogen atom.
- correct answer False
*proline, not histidine
T/F: The side chain of proline is bonded to the backbone nitrogen atom.
- correct answer True
T/F: The name of the molecule that binds to an enzyme is called the apoenzyme.
- correct answer False
*substrate, not apoenzyme
, T/F: The name of the molecule that binds to an enzyme is called the ligand.
- correct answer False
*substrate, not ligand
T/F: An inhibitor that binds at the active site is an uncompetitive inhibitor.
- correct answer False
*competitive inhibitor, not an uncompetitive inhibitor
T/F: An inhibitor that binds at the active site is a coenzyme.
- correct answer False
*competitive inhibitor, not a coenzyme
Which amino acids differ by only one atom?
A) Ser and Thr
B) Leu and Ile
C) Ala and Ser
D) Asp and Asn
E) Ser and Cys
- correct answer E) Ser and Cys
*serine has an -OH group where cysteine has an -SH group
Which amino acids both have an R group (side chain) with an -OH functional group?
A) Ser and Thr
