Chem 221 - Biochemistry for Science Majors » Fall 2021 » L5 3D Structure of Proteins Part 1 of 2
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Question #1
Gobular proteins
A.
have their hydrophilic side chains are on the outside, exposed to the solvent, water.
B.
have their hydrophobic amino acid side chains are in the interior of the molecule
C.
are roughly spherical in shape
D.
All of these are correct
E.
are water soluble
Question #2
The linear arrangement of amino acids in a protein is called primary structure
A.
TRUE
B.
FALSE
Question #3
The sequence of amino acids in a protein is listed from the C-terminus to the N-terminus.
A.
TRUE
B.
FALSE
Question #4
Proteins channels within membranes, have hydrophobic amino acid side chains oriented outward.
A.
FALSE
B.
TRUE
Question #5
Membrane proteins characteristically have a larger number of hydrophilic amino acids than cytosolic proteins.
A.
FALSE
B.
TRUE
Question #6
Sickle cell anemia is an important example of conservative mutation.
A.
TRUE
B.
FALSE
Question #7
At physiological pH, the N-terminal and C-terminal residues can form salt bridges.
A.
TRUE
B.
FALSE
Question #8
During the formation of the peptide bond which of the following takes place?
A.
Hydroxyl group is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
B.
Hydrogen atom is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
C.
Hydroxyl group is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid
D.
Hydrogen atom is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid
Question #9
Peptide bond is a _________
A.
Hydrogen bond
B.
ionic bond
C.
Covalent bond
D.
Metallic bond
Question #10
A tripeptide has _________
A.
3 amino acids and 4 peptide bonds
B.
3 amino acids and 3 peptide bonds
C.
3 amino acids and 1 peptide bond
D.
3 amino acids and 2 peptide bonds
Question #11
The peptide bond in proteins is
A.
not cleavable by hydrolysis.
B.
planar, but rotates to three preferred dihedral angles.
C.
planar, and usually found in a trans configuration.
D.
nonpolar, and fixed in a trans conformation
E.
nonpolar, but rotates to three preferred dihedral angles.
Question #12
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond
A.
still isn't completely understood by chemists.
B.
has partial double bond character.
C.
is weaker than an ordinary single bond.
Question #13
How many water molecules are lost from the condensation of 100 amino acids into a polypeptide?
A.
102
B.
101
C.
98
D.
99
E.
100
Question #14
Amino acids are connected via __________ bonds, which occur between the carboxyl group of one amino acid and the amino group of another.
A.
peptide
B.
hydrogen
C.
amino
D.
double
E.
ionic
Question #15
Condensation of 3 amino acids
A.
requires 2 molecules of water
B.
releases 2 molecules of water
C.
releases 3 molecules of water
Question #16
In how many different ways can the amino acids leucine, glutamate, and glycine be arranged?
A.
6
B.
4
C.
2
D.
3
E.
5
Question #17
What accounts for peptide bond planarity within a polypeptide?
A.
The peptide bond is not planar, it can actually rotate relatively freely
B.
Partial double bond character of the peptide bond
C.
Hydrogen bonding between amino acid side chains and water
D.
Electronegativity differences between nitrogen and carbon
E.
The fully double bonded peptide bond
Question #18
What does N-terminus refer to?
A.
A protein chain
B.
The end of a protein with a free carboxylic acid group
C.
The end of a protein with a free amine group
D.
The first amino acid with the abbreviation 'N' in the protein
Question #19
Which of the following statements is true about protein structure?
A.
A protein’s function depends on its spatial conformation
B.
All proteins have a quaternary structure
C.
Disulfide bridges primarily maintain secondary structures, as opposed to tertiary
D.
pH does not change the protein conformation
Question #20
The six atoms of the peptide group lie in a single plane and the configuration around the peptide bond is cis.
A.
TRUE
B.
FALSE
Question #21
Sickle cell anemia is an example of a genetic disease due to a problem with
A.
the function of all proteins in an organism
B.
the primary structure of the hemoglobin protein
C.
the primary structure of the myoglobin protein
D.
the secondary structure of a protein
Question #22
In the peptide Ser-Cys-Glu-Ala, the C-terminal end is ________.
A.
cysteine
B.
glutamic acid
C.
alanine
D.
glycine
Question #23
Uncharged side chains may experience ionic interactions in a protein structure.
A.
TRUE
B.
FALSE
Question #24
N-terminal and C-terminals may experience the formation of salt bridges
A.
TRUE
B.
FALSE
Question #25
In a soluble protein that resides in the cytoplasm, where is the majority of the nonpolar amino acids found in its three-dimensional structure?
A.
Localized to the C-terminus of the protein
B.
On the surface of the protein
C.
Buried in the center of the protein
D.
Randomly interspersed throughout to protein
E.
Localized to the N-terminus of the protein
Question #26
The formation of a tetrapeptide.
A.
Requires 3 water molecules
B.
Requires 4 water molecules
C.
Releases 3 water molecules
D.
Releases 4 water molecules
Question #27
The ability of a particular protein to carry out its function is determined by its overall three-dimensional shape, or conformation.
A.
TRUE
B.
FALSE
Question #28
In the peptide Ala-Try-Gly-Phe, the N-terminal amino acid is ________.
A.
glycine
B.
alanine
C.
phenylalanine
D.
aspartic acid
E.
tryptophan
Question #29
If, in a protein there is a change of an amino acid for another one, for instance a leucine is changed for lysine, the function of the protein most likely
A.
won't be affected
B.
will be affected
Question #30
A peptide bond is formed by hydrolysis reaction between the carboxyl group of one amino acid and the amino group of another.
A.
TRUE
B.
FALSE
Question #31
Where in a globular protein is the amino acid valine likely to be located?
A.
The hydrophobic interior
B.
The hydrophilic interior
C.
The hydrophobic exterior
D.
The hydrophilic exterior
Question #32
Which proteins are generally water-soluble?
A.
Both globular fibrous proteins
B.
Globular proteins
C.
Neither globular nor fibrous proteins
D.
Fibrous proteins
Question #33
To hydrolyze a pentapeptide you need
A.
4 molecules of water
B.
2 molecules of water
C.
5 molecules of water
D.
3 molecules of water
Question #34
A peptide bond is
A.
a covalent ether bond
B.
a covalent bond
C.
an amide bond
D.
an ether bond
E.
a covalent amide bond
Question #35
The peptide bond of proteins resembles the bond found in
A.
alkenes
B.
hydrocarbons
C.
alkynes
D.
alkanes
Question #36
What type of interaction would occur between glutamic acid and lysine?
A.
disulfide
B.
Ionic
C.
Hydrophobic
D.
hydrogen bonding
Question #37
A.
peptide bonds
B.
Ionic
C.
hydrogen bonding
D.
Hydrophobic
Question #38
Which of the following best describes the quaternary structure of a protein?
A.
How the polypeptide chains arrange in space
B.
The sequence of nucleic acids
C.
The four parts of a protein's amino acid sequence
D.
A polypeptide chain 3-D structure
E.
The layout of alpha-helices and beta-sheets
Question #39
A protein's primary structure is determined by which of the following?
A.
The hydrophobic effect
B.
The linear sequence of specific amino acids
C.
Beta-pleated sheets
D.
R-group interactions
E.
Alpha-helices
Question #40
Where, in a globular protein, is the amino acid glutamine likely to be located?
A.
The hydrophilic exterior
B.
The hydrophobic exterior
C.
The hydrophilic interior
D.
The hydrophobic interior
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