Portage Learning Chem 210 Module 3 exam
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(Short response) A. Define the primary level of protein structure. B) How do scientists
communicate the primary sequence? - CORRECT ANSWER: The primary level is the
order of amino acids covalently bonded together, including disulfide bonds, in a
polypeptide chain. The primary sequence is written, for proteins, from N to C terminal
using the one-letter or three-letter abbreviations.
(short response) One protein has a stable structure known as a"helix-turn-helix"
arrangement. What is the term that describes these stable collections of protein
structure and where do they fit in protein structure levels? - CORRECT ANSWER: The
helix-turn-helix structure is a motif. 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. They are between true secondary and
tertiary structures.
(short response) Staphylokinase is said to be a dimer. A) What is a dimer? B)
Structurally, a dimer describes what level of protein organization? - CORRECT
ANSWER: A) This enzyme has two independent polypeptide chains interacting non-
covalently. In this case, they are identical 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.
All of the 20 standard amino acids contain an R-group that is attached to the:
A) α carbon
B) Carboxyl group
C) Amino group
D) β carbon
E) None of the above - CORRECT ANSWER: A
, An enzyme requires Cr+3 for catalysis. When the enzyme contains the Cr3+ it called
a/an _________. - CORRECT ANSWER: Holoenzyme
An organic molecule that is necessary for an enzyme's function is called a: - CORRECT
ANSWER: Coenzyme
Consider the following protein structure.
A) Is the protein globular or fibrous? Explain your response in at least one complete
sentence giving at least one (1) piece of evidence in your response.
B) Identify at least two (2) types of secondary structure present in the following protein. -
CORRECT ANSWER: A) Globular proteins are ball-like in shape, while fibrous proteins
are extended. Note the long strands of alpha-helices. B) Point out the two types of
secondary structure shown here in this protein (as indicated in the module).
Define the term "active site." - CORRECT ANSWER: 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.
Formally, when there are 100 or more amino acids are covalently linked together that is
called a _________. - CORRECT ANSWER: Protein
How many classes of enzymes are recognized by the IUBMB? - CORRECT ANSWER:
6
In an alpha helix, the R groups on the amino acid residues: - CORRECT ANSWER: Are
found on the outside of the helix spiral
Motifs are classified primarily by their: - CORRECT ANSWER: Content and
arrangement of the secondary structure
Latest Update 2024-2025 Actual Exam from
Credible Sources with Questions and Verified
Correct Answers Golden Ticket to Guaranteed
A+ Verified by Professor
(Short response) A. Define the primary level of protein structure. B) How do scientists
communicate the primary sequence? - CORRECT ANSWER: The primary level is the
order of amino acids covalently bonded together, including disulfide bonds, in a
polypeptide chain. The primary sequence is written, for proteins, from N to C terminal
using the one-letter or three-letter abbreviations.
(short response) One protein has a stable structure known as a"helix-turn-helix"
arrangement. What is the term that describes these stable collections of protein
structure and where do they fit in protein structure levels? - CORRECT ANSWER: The
helix-turn-helix structure is a motif. 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. They are between true secondary and
tertiary structures.
(short response) Staphylokinase is said to be a dimer. A) What is a dimer? B)
Structurally, a dimer describes what level of protein organization? - CORRECT
ANSWER: A) This enzyme has two independent polypeptide chains interacting non-
covalently. In this case, they are identical 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.
All of the 20 standard amino acids contain an R-group that is attached to the:
A) α carbon
B) Carboxyl group
C) Amino group
D) β carbon
E) None of the above - CORRECT ANSWER: A
, An enzyme requires Cr+3 for catalysis. When the enzyme contains the Cr3+ it called
a/an _________. - CORRECT ANSWER: Holoenzyme
An organic molecule that is necessary for an enzyme's function is called a: - CORRECT
ANSWER: Coenzyme
Consider the following protein structure.
A) Is the protein globular or fibrous? Explain your response in at least one complete
sentence giving at least one (1) piece of evidence in your response.
B) Identify at least two (2) types of secondary structure present in the following protein. -
CORRECT ANSWER: A) Globular proteins are ball-like in shape, while fibrous proteins
are extended. Note the long strands of alpha-helices. B) Point out the two types of
secondary structure shown here in this protein (as indicated in the module).
Define the term "active site." - CORRECT ANSWER: 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.
Formally, when there are 100 or more amino acids are covalently linked together that is
called a _________. - CORRECT ANSWER: Protein
How many classes of enzymes are recognized by the IUBMB? - CORRECT ANSWER:
6
In an alpha helix, the R groups on the amino acid residues: - CORRECT ANSWER: Are
found on the outside of the helix spiral
Motifs are classified primarily by their: - CORRECT ANSWER: Content and
arrangement of the secondary structure
