BIOL 150 Exam 2 KU QUESTION AND
ANSWERS ALREADY PASSED (21 PGS)
True or false: The sequence of amino acids in a protein is referred to as its
primary structure. - correct answer ✔true
Which one of the following is specific to the synthesis of only one type of
protein?
a transfer RNA
an aminoacyl tRNA synthetase
an elongation factor
a ribosome
a messenger RNA - correct answer ✔messenger RNA
Which of the following steps in translation comes earliest?
identification of initiator codon and joining of large and small ribosomal
subunits
movement of the ribosome three bases closer to the 3' end of the mRNA
release of the polypeptide from the ribosome and dissociation of ribosomal
subunits
peptide bond formation - correct answer ✔identification of initiator codon
and joining of large and small ribosomal subunits
True or False: amino acids with hydrophobic side chains are most often found
buried in the interior of folded proteins. - correct answer ✔true
,The covalent bond between adjacent amino acids in a polypeptide chain is
referred to as a ____________ bond. - correct answer ✔peptide
The three-dimensional structure of a functional protein composed of a single
polypeptide chain is referred to as the ____________ structure.
tertiary
secondary
quaternary
primary - correct answer ✔tertiary
True or False: the individual polypeptide chains in a multi-subunit protein each
have their own primary, secondary, and tertiary structure. - correct answer
✔true
Secondary structure is characterized by which one of the following types of
interactions?
A covalent bond between two cysteines
The bond between an amino nitrogen and a carboxyl carbon
Hydrogen bonding between side chains of amino acids
Hydrogen bonding within the peptide backbone
Ionic bonding between an acidic side chain and a basic side chain - correct
answer ✔Hydrogen bonding within the peptide backbone
Which one of the following can contribute to a protein's tertiary structure?
Ionic bonding
, Hydrogen bonding
van der Waal's forces
Covalent bonding
All of these choices are correct. - correct answer ✔all of these choices are
correct
The unfolding of a protein by heat or chemical treatment is referred to as:
depolymerization.
disaggregation.
hydrolysis.
uncoupling.
denaturation. - correct answer ✔denaturation
Proteins that do not refold properly after being heated generally require the
assistance of which one of the following types of molecules in vivo?
Transferases
Ribosomes
Chaperones
Polymerases
Enhancers - correct answer ✔chaperones
The three-dimensional shape of a protein is determined by the primary,
secondary, tertiary, and in many cases, the quaternary structure of the
protein. The following sentence is taken from scientific articles on protein
structure. Choose the level of protein structure that applies best to the
sentence.
ANSWERS ALREADY PASSED (21 PGS)
True or false: The sequence of amino acids in a protein is referred to as its
primary structure. - correct answer ✔true
Which one of the following is specific to the synthesis of only one type of
protein?
a transfer RNA
an aminoacyl tRNA synthetase
an elongation factor
a ribosome
a messenger RNA - correct answer ✔messenger RNA
Which of the following steps in translation comes earliest?
identification of initiator codon and joining of large and small ribosomal
subunits
movement of the ribosome three bases closer to the 3' end of the mRNA
release of the polypeptide from the ribosome and dissociation of ribosomal
subunits
peptide bond formation - correct answer ✔identification of initiator codon
and joining of large and small ribosomal subunits
True or False: amino acids with hydrophobic side chains are most often found
buried in the interior of folded proteins. - correct answer ✔true
,The covalent bond between adjacent amino acids in a polypeptide chain is
referred to as a ____________ bond. - correct answer ✔peptide
The three-dimensional structure of a functional protein composed of a single
polypeptide chain is referred to as the ____________ structure.
tertiary
secondary
quaternary
primary - correct answer ✔tertiary
True or False: the individual polypeptide chains in a multi-subunit protein each
have their own primary, secondary, and tertiary structure. - correct answer
✔true
Secondary structure is characterized by which one of the following types of
interactions?
A covalent bond between two cysteines
The bond between an amino nitrogen and a carboxyl carbon
Hydrogen bonding between side chains of amino acids
Hydrogen bonding within the peptide backbone
Ionic bonding between an acidic side chain and a basic side chain - correct
answer ✔Hydrogen bonding within the peptide backbone
Which one of the following can contribute to a protein's tertiary structure?
Ionic bonding
, Hydrogen bonding
van der Waal's forces
Covalent bonding
All of these choices are correct. - correct answer ✔all of these choices are
correct
The unfolding of a protein by heat or chemical treatment is referred to as:
depolymerization.
disaggregation.
hydrolysis.
uncoupling.
denaturation. - correct answer ✔denaturation
Proteins that do not refold properly after being heated generally require the
assistance of which one of the following types of molecules in vivo?
Transferases
Ribosomes
Chaperones
Polymerases
Enhancers - correct answer ✔chaperones
The three-dimensional shape of a protein is determined by the primary,
secondary, tertiary, and in many cases, the quaternary structure of the
protein. The following sentence is taken from scientific articles on protein
structure. Choose the level of protein structure that applies best to the
sentence.
