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L5 3D Structure of Proteins Part 1 of 2

Navigation   » List of Schools  »  West Los Angeles College  »  Chemistry  »  Chem 221 – Biochemistry for Science Majors  »  Fall 2021  »  L5 3D Structure of Proteins Part 1 of 2

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Below are the questions for the exam with the choices of answers:

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