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Module 3 Exam - Requires Respondus LockDown
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Due No due date Points 100 Questions 30 Time Limit 120 Minutes
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LATEST Attempt 1 30 minutes 90 out of 100
Score for this quiz: 90 out of 100
Submitted Apr 4 at 3:09pm
This attempt took 30 minutes.
Question 1^0 / 3^ pts
True or False: The amino acids cysteine and methionine both contain
sulfur atoms.
orrect Answerorrect Answer True ou Answeredou Answered False
Question 2^3 / 3^ pts
True or False: The following secondary structure shown below is an
example of an Antiparallel beta sheet.
True Correct!Correct! False
Question 3^3 / 3^ pts
True or False. The side chain of histidine is bonded to the backbone
nitrogen atom.
True Correct!Correct! False
Question 4^3 / 3^ pts
True or False: The name of the molecule that binds to an enzyme is
called the holoenzyme.
True Correct!Correct! False
Question 5^3 / 3^ pts
Isomerization Double-bond breaking
Question 8^3 / 3^ pts
The peptide Ala-Glu-Gly-Ala-Leu-Arg has ______.
A disulfide bond Correct!Correct! Five peptide bonds Four peptide bonds A proline residue No C-terminal
Question 9^0 / 3^ pts
Formally, when there are 99 or fewer amino acids are covalently linked
together that is called a _________.
orrect Answerorrect Answer Polypeptide
Oligopeptide Peptide ou Answeredou Answered Protein Polyprotein
Question 10^3 / 3^ pts
What unit is used by biochemists to indicate the mass of a protein?
g/mol Correct!Correct! Da
Ba Mol/g g
Question 11^3 / 3^ pts
All of the 20 standard amino acids contain an R-group that is attached to
the:
A) carbon
B) Carboxyl group
C) Amino group
D) carbon
E) None of the above
Correct!Correct! A
B C
Question 14^3 / 3^ pts
In one turn of a helix, there approximate _________ amino acids.
Correct!Correct! 3.
None of the above
Question 15^3 / 3^ pts
In an alpha helix, the R groups on the amino acid residues:
Alternate between the inside and outside of the helix Cause only left-handed helices to form Generate the hydrogen bonds that form the helix Stack within the interior of the helix Correct!Correct! Are found on the outside of the helix spiral
Question 16^3 / 3^ pts
Motifs are classified primarily by their:
Amino acid sequence Evolutionary relationships Correct!Correct! Content and arrangement of the secondary structure Content and arrangement of the tertiary structure Subunit content and arrangement
Question 17^0 / 3^ pts
The secondary structure shown below is an example of a(n):
orrect Answerorrect Answer Parallel beta sheet
Antiparallel beta sheet alpha helix
Question 20^3 / 3^ pts
An enzyme requires Cr for catalysis. When the enzyme contains the
Cr it called a/an _________.
3+
Correct!Correct! Holoenzyme
Apoenzyme Fully ready molecule Inhibitor Competitive inhibitor
Question 21^3 / 3^ pts
As a substrate reacts to become a product, it goes through the ________,
which is a high potential energy state.
Conversion State Stable mode Unstable mode Conversion Mode Correct!Correct! Transition state
Question 22^3 / 3^ pts
What three factors influence the rate of an enzyme-catalyzed reaction?
pH, polarity, and concentration pH, polarity, and temperature polarity, concentration, and temperature amino acids, concentration, and temperature Correct!Correct! pH, concentration, and temperature
Question 23^3 / 3^ pts
The concept of induced fit refers to the fact that:
When a substrate binds to an enzyme, the enzyme induces loss of water Enzyme specificity is induced in the enzyme-substrate The enzyme-substrate binding increases the temperature Correct!Correct! Substrate binding induces a conformation change in the enzyme
The substrate bends and twists before it binds to the enzyme
Question 24^3 / 3^ pts
The ES stands for:
Your Answer:
This protein pictured above is globular (more "ball like"). The types of
secondary structures present are alpha helices, the coiled structures,and
beta sheets, the repetitive parallel sheet-like structures.
A) It is a globular protein because of its ball-like shape.
Fibrous proteins are usually long and extended. B) There is
one alpha helix in front and some in the back. Also present is
a beta sheet; there seems to be both parallel and antiparallel
strands here. Beta turns may be present, but are not required
in the answer.
Question 27^5 / 5^ pts
Your Answer:
(short response) Hemoglobin is said to be a tetramer. A) What is a
tetramer? B) Structurally, a tetramer describes what level of protein
organization?
Hemoglobin is a tetramer, a protein with four subunits. Two subunits are
called alpha subunits, and the other two are beta subunits. The structural
level of protein organization a tetramer describes is called quaternary
structure, which contains more than two independant subunit structures.
A) Simply it means that hemoglobin has four subunits or four
independent polypeptide chains interacting non-covalently.
Each protein molecule is composed of two copies each of two
different subunits a and b. We say that hemoglobin is a
tetramer because it has four polypeptide chains.
B) It is describing the quaternary structure, which has two or
more independent polypeptide chains that associate with one
another to form a quaternary structure.
Question 28^5 / 5^ pts
Your Answer:
(short response) There are collections of protein structure that fit between
true secondary and true tertiary structure. What is the name of the
collections of protein structure? Explain this type of structure.
The collections of protein structure that fit between the true secondary
and true tertiary structures are motifs. These arrangements are stable and
occupy arrangements of secondary structures. This structure is found in
many different proteins.
Motifs occupy a position between secondary and tertiary.
Motifs are particularly stable arrangements of secondary
structure, including the connections between them. Motifs are
found in a variety of proteins from across all organisms.
The active site is the spot on the enzyme where catalysis
takes place. This area is often small when compared to the
overall size of the protein. In fact, about 10 amino acids make
up the active site.
Quiz Score: 90 out of 100
