BIOCHEMISTRY FOURTH EDITION
COMPREHENSIVE TEST PAPER 2026
CERTIFICATION EVALUATION MODULE
PRACTICE BANK
◉ *number 22* Which represents the correct arrangement of
bonding in a peptide bond?
Answer: C
◉ Trace directly the covalently bonded backbone atoms from the N
to C terminus of a dipeptide. Which atoms are found in this trace?a.
NCCNCC
b. NCCONCCO
c. NCONCO d. CNCCNC
Answer: A
◉ To what organic reaction class does peptide bond formation
belong? a. condensation
b. isomerization c. oxidation
d. addition
Answer: A
,◉ The peptide bond
a. is most stable in the cis configuration.
b. has a mix of single and double bond characters.
c. can rotate around the carbonyl and N bond but not around the α-
carbon and N bond.
d. can function as a weak acid and weak base.
Answer: B
◉ The peptide bond is stronger than the ester bond. What structural
feature of the peptide bond gives it additional bond strength?
a. Resonance structures give the peptide bond some double bond
character.
b. The peptide bond is between carbon and nitrogen instead of
carbon and oxygen
atoms.
c. The peptide bond is more polar.
d. Peptide bonds can hydrogen bond.
Answer: A
◉ The dipole moment associated with a peptide bond proceeds from
which amide? a. the Ct o the O atom
b. the C to the N atom
c. the O to the H atom
, d. the H to the O atom
Answer: D
◉ What do Ramachandran plots show?
a. Only some ψ and φ angles are commonly found in proteins.
b. The chiral carbon in amino acids is found largely in the S
configuration.
c. Peptide backbones form mostly linear chains.
d. The α-carbon is chiral.
Answer: A
◉ The φ and ψ angles are the
a. flatness of the peptide bond.
b. torsion angles on either side of the α-carbon.
c. angles of each amino acid side chain.
d. peptide bond plane angle.
Answer: B
◉ The points in the Ramachandran plot are derived by *see 30*
a. counting the number of amino acids and placing points in allowed
regions.
COMPREHENSIVE TEST PAPER 2026
CERTIFICATION EVALUATION MODULE
PRACTICE BANK
◉ *number 22* Which represents the correct arrangement of
bonding in a peptide bond?
Answer: C
◉ Trace directly the covalently bonded backbone atoms from the N
to C terminus of a dipeptide. Which atoms are found in this trace?a.
NCCNCC
b. NCCONCCO
c. NCONCO d. CNCCNC
Answer: A
◉ To what organic reaction class does peptide bond formation
belong? a. condensation
b. isomerization c. oxidation
d. addition
Answer: A
,◉ The peptide bond
a. is most stable in the cis configuration.
b. has a mix of single and double bond characters.
c. can rotate around the carbonyl and N bond but not around the α-
carbon and N bond.
d. can function as a weak acid and weak base.
Answer: B
◉ The peptide bond is stronger than the ester bond. What structural
feature of the peptide bond gives it additional bond strength?
a. Resonance structures give the peptide bond some double bond
character.
b. The peptide bond is between carbon and nitrogen instead of
carbon and oxygen
atoms.
c. The peptide bond is more polar.
d. Peptide bonds can hydrogen bond.
Answer: A
◉ The dipole moment associated with a peptide bond proceeds from
which amide? a. the Ct o the O atom
b. the C to the N atom
c. the O to the H atom
, d. the H to the O atom
Answer: D
◉ What do Ramachandran plots show?
a. Only some ψ and φ angles are commonly found in proteins.
b. The chiral carbon in amino acids is found largely in the S
configuration.
c. Peptide backbones form mostly linear chains.
d. The α-carbon is chiral.
Answer: A
◉ The φ and ψ angles are the
a. flatness of the peptide bond.
b. torsion angles on either side of the α-carbon.
c. angles of each amino acid side chain.
d. peptide bond plane angle.
Answer: B
◉ The points in the Ramachandran plot are derived by *see 30*
a. counting the number of amino acids and placing points in allowed
regions.
