Portage Biochemistry- Module 3 Exam Questions &
Answers A+ Score Assured
Name three different functions of proteins. - Answer Transport, hormones, catalysis, structure, and
protection
What function does a protease have? - Answer catalysis. It degrades proteins.
What is the function of hormones? - Answer These proteins communicate from one cell to another
What are the functional groups common to all amino acids? - Answer amine and carboxylic acid
Briefly describe the five major groupings of amino acids. - Answer The amino acids are grouped into 1)
nonpolar, aliphatic 2) nonpolar and aromatic 3) polar but neutral, 4) acidic, and 5) basic.
What is the name, one-letter abbreviation, and three-letter abbreviation of the following amino acid? -
Answer Arginine, R, Arg (study cards)
What amino acid can form a disulfide bond? - Answer cysteine
Which amino acid is the only one to have its side chain connected to the amine group? - Answer proline
Consider the following protein structure. Fill the blanks with the appropriate term below.
The major type of secondary structure present in this protein is ____A_______.
The protein's overall tertiary structure is a _______B______ conformation. (select one: globular or
fibrous).
This protein has two polypeptide chains, which indicates it has ______C______ structure. - Answer (A)
alpha helices
(B) globular
(C) quaternary
, Consider the following pentapeptide: ETYLVD.
Which amino acid is at the N terminal? Which is at the C terminal? - Answer E is at the N-terminal, and D
is at the C-terminal.
Consider the following tetrapeptide. A) Use the three-letter abbreviations to write the representation of
the following tetrapeptide. B) How many peptide bonds are in this peptide? (see card) - Answer A) Lys-
Asp-Ile-Thr
B) 3 peptide bonds connect four amino acids.
Differentiate between protein tertiary structure and protein quaternary structure. - Answer Tertiary
structure is the conformation or shape of a single polypeptide chain. Quaternary structure is the
orientation of multiple subunits.
Proteins typically adopt either a conformation that is fibrous or ___________. - Answer globular
What is the function of an enzyme? - Answer to accelerate the rate of a biological reaction
How does a competitive inhibitor differ from a uncompetitive inhibitor? - Answer A competitive inhibitor
binds at the active site of the enzyme. An uncompetitive inhibitor binds at a site distinct from the active
site, but it still inhibits the enzyme.
What three factors influence enzyme catalyzed reactions? - Answer pH, temperature, and concentration
of enzyme and substrate
True or False: The amino acids serine and threonine both contain sulfur atoms.
True
False - Answer False
True or False: The following secondary structure shown below is an example of an Antiparallel beta
sheet.
True
Answers A+ Score Assured
Name three different functions of proteins. - Answer Transport, hormones, catalysis, structure, and
protection
What function does a protease have? - Answer catalysis. It degrades proteins.
What is the function of hormones? - Answer These proteins communicate from one cell to another
What are the functional groups common to all amino acids? - Answer amine and carboxylic acid
Briefly describe the five major groupings of amino acids. - Answer The amino acids are grouped into 1)
nonpolar, aliphatic 2) nonpolar and aromatic 3) polar but neutral, 4) acidic, and 5) basic.
What is the name, one-letter abbreviation, and three-letter abbreviation of the following amino acid? -
Answer Arginine, R, Arg (study cards)
What amino acid can form a disulfide bond? - Answer cysteine
Which amino acid is the only one to have its side chain connected to the amine group? - Answer proline
Consider the following protein structure. Fill the blanks with the appropriate term below.
The major type of secondary structure present in this protein is ____A_______.
The protein's overall tertiary structure is a _______B______ conformation. (select one: globular or
fibrous).
This protein has two polypeptide chains, which indicates it has ______C______ structure. - Answer (A)
alpha helices
(B) globular
(C) quaternary
, Consider the following pentapeptide: ETYLVD.
Which amino acid is at the N terminal? Which is at the C terminal? - Answer E is at the N-terminal, and D
is at the C-terminal.
Consider the following tetrapeptide. A) Use the three-letter abbreviations to write the representation of
the following tetrapeptide. B) How many peptide bonds are in this peptide? (see card) - Answer A) Lys-
Asp-Ile-Thr
B) 3 peptide bonds connect four amino acids.
Differentiate between protein tertiary structure and protein quaternary structure. - Answer Tertiary
structure is the conformation or shape of a single polypeptide chain. Quaternary structure is the
orientation of multiple subunits.
Proteins typically adopt either a conformation that is fibrous or ___________. - Answer globular
What is the function of an enzyme? - Answer to accelerate the rate of a biological reaction
How does a competitive inhibitor differ from a uncompetitive inhibitor? - Answer A competitive inhibitor
binds at the active site of the enzyme. An uncompetitive inhibitor binds at a site distinct from the active
site, but it still inhibits the enzyme.
What three factors influence enzyme catalyzed reactions? - Answer pH, temperature, and concentration
of enzyme and substrate
True or False: The amino acids serine and threonine both contain sulfur atoms.
True
False - Answer False
True or False: The following secondary structure shown below is an example of an Antiparallel beta
sheet.
True
