L5 3D Structure of Proteins Part 1 of 2

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Question #1

Where, in a globular protein, is the amino acid glutamine likely to be located?

A The hydrophilic interior

B The hydrophobic exterior

C The hydrophilic exterior

D The hydrophobic interior

Question #2

A protein’s primary structure is determined by which of the following?

A R-group interactions

B The linear sequence of specific amino acids

C Alpha-helices

D Beta-pleated sheets

E The hydrophobic effect

Question #3

Which of the following best describes the quaternary structure of a protein?

A A polypeptide chain 3-D structure

B The sequence of nucleic acids

C How the polypeptide chains arrange in space

D The four parts of a protein’s amino acid sequence

E The layout of alpha-helices and beta-sheets

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 peptide bonds

B Ionic

C Hydrophobic

D hydrogen bonding

Question #5

What type of interaction would occur between glutamic acid and lysine?

A hydrogen bonding

B Hydrophobic

C Ionic

D disulfide

Question #6

The peptide bond of proteins resembles the bond found in

A alkynes

B alkenes

C hydrocarbons

D alkanes

Question #7

A peptide bond is

A a covalent bond

B a covalent ether bond

C an ether bond

D an amide bond

E a covalent amide bond

Question #8

To hydrolyze a pentapeptide you need

A 3 molecules of water

B 2 molecules of water

C 5 molecules of water

D 4 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 hydrophilic interior

D The hydrophobic exterior

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 will be affected

B won’t be affected

Question #13

In the peptide Ala-Try-Gly-Phe, the N-terminal amino acid is ________.

A alanine

B aspartic acid

C tryptophan

D phenylalanine

E glycine

Question #14

The ability of a particular protein to carry out its function is determined by its overall three-dimensional shape, or conformation.

A FALSE

B TRUE

Question #15

The formation of a tetrapeptide.

A Releases 3 water molecules

B Requires 3 water molecules

C Releases 4 water molecules

D Requires 4 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 Randomly interspersed throughout to protein

C Localized to the N-terminus of the protein

D On the surface of the protein

E Localized to the C-terminus 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 alanine

C glutamic acid

D cysteine

Question #20

Sickle cell anemia is an example of a genetic disease due to a problem with

A the primary structure of the myoglobin protein

B the secondary structure of a protein

C the primary structure of the hemoglobin protein

D the function of all proteins in an organism

Question #21

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 #22

Which of the following statements is true about protein structure?

A pH does not change the protein conformation

B Disulfide bridges primarily maintain secondary structures, as opposed to tertiary

C A protein’s function depends on its spatial conformation

D All proteins have a quaternary structure

Question #23

What does N-terminus refer to?

A The first amino acid with the abbreviation ‘N’ in the protein

B A protein chain

C The end of a protein with a free amine group

D The end of a protein with a free carboxylic acid group

Question #24

What accounts for peptide bond planarity within a polypeptide?

A Electronegativity differences between nitrogen and carbon

B The fully double bonded peptide bond

C Partial double bond character of the peptide bond

D Hydrogen bonding between amino acid side chains and water

E The peptide bond is not planar, it can actually rotate relatively freely

Question #25

In how many different ways can the amino acids leucine, glutamate, and glycine be arranged?

A 3

B 4

C 5

D 6

E 2

Question #26

Condensation of 3 amino acids

A releases 2 molecules of water

B releases 3 molecules of water

C requires 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 hydrogen

B amino

C double

D ionic

E peptide

Question #28

How many water molecules are lost from the condensation of 100 amino acids into a polypeptide?

A 101

B 98

C 100

D 99

E 102

Question #29

The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

A is weaker than an ordinary single bond.

B still isn’t completely understood by chemists.

C has partial double bond character.

Question #30

The peptide bond in proteins is

A nonpolar, but rotates to three preferred dihedral angles.

B planar, but rotates to three preferred dihedral angles.

C planar, and usually found in a trans configuration.

D not cleavable by hydrolysis.

E nonpolar, and fixed in a trans conformation

Question #31

A tripeptide has _________

A 3 amino acids and 4 peptide bonds

B 3 amino acids and 2 peptide bonds

C 3 amino acids and 1 peptide bond

D 3 amino acids and 3 peptide bonds

Question #32

Peptide bond is a _________

A Covalent bond

B ionic bond

C Metallic bond

D Hydrogen bond

Question #33

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 hydrogen atom is lost from its amino group of another amino acid

C 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

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 TRUE

B FALSE

Question #39

The linear arrangement of amino acids in a protein is called primary structure

A TRUE

B FALSE

Question #40

Gobular proteins

A All of these are correct

B have their hydrophilic side chains are on the outside, exposed to the solvent, water.

C have their hydrophobic amino acid side chains are in the interior of the molecule

D are roughly spherical in shape

E are water soluble

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L5 3D Structure of Proteins Part 1 of 2

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