Principles of Biochemistry Exam 1 -
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
ionic interactions -
correct answer ✅electrostatic interactions between two fully
charged atoms or groups with opposite charges
hydrogen bonds -
correct answer ✅electrostatics interactions between hydrogen
covalently bonded to an electronegative element (O,N) and nearby
O, or N
Van der waals interactions -
correct answer ✅transient electrostatic interaction between
permanent and/or induced dipoles
hydrophobic interactions -
correct answer ✅association of non polar molecules or groups
with each other in aqueous systems
4 non covalent interactions (weak) -
correct answer ✅ionic
hydrogen bonds
Van der Waals
,Principles of Biochemistry Exam 1 -
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
Hydrophobic
water molecule -
correct answer ✅can form 4 hydrogen bonds, hydrophilic
molecules, can be ionic or polar substances, readily dissolve in
water
water molecule -
correct answer ✅can form up to 4 hydrogen bonds, high boiling
point, melting point, heat of vaporization and surface tension
hydrophilic molecules -
correct answer ✅water loving molecules
hydrophilic molecules -
correct answer ✅water soluble molecules
ionizable (ionic) or polar groups -
correct answer ✅Water soluble molecules usually contain one or
more
,Principles of Biochemistry Exam 1 -
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
solvation spheres around ions -
correct answer ✅molecules that contain (+) or (-) ionic groups
interact with water and form ________ and are water soluble
salt -
correct answer ✅example of a salvation sphere
hydrogen bonds -
correct answer ✅the polar water molecules attract the negative
and positive areas on the polar molecules to form ______ which
makes it dissolve in water
hydrophilic molecules -
correct answer ✅ionic and polar substances readily dissolve in
water they are _______
polar groups -
correct answer ✅contain electronegative atoms (O,N,S) that give
rise to unequal sharing of electrons in the bonds
, Principles of Biochemistry Exam 1 -
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
hydrogen bond -
correct answer ✅this polarity of the bonds results in the ability to
______ ______ with other polar groups through partial charge
attraction
list some common polar groups in biomolecules -
correct answer ✅hydroxyl -OH
sulfhydryl -SH
amino -NH2
Carbonyl ( aldehyde) -COH
Carboxyl -COO-
Carbonyl ( Ketone) - CO-
common charges groups in biomolecules -
correct answer ✅Amino - NH3+
Carboxyl - COO-
Phosphoryl
hydrophobic -
correct answer ✅water-insoluble
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
ionic interactions -
correct answer ✅electrostatic interactions between two fully
charged atoms or groups with opposite charges
hydrogen bonds -
correct answer ✅electrostatics interactions between hydrogen
covalently bonded to an electronegative element (O,N) and nearby
O, or N
Van der waals interactions -
correct answer ✅transient electrostatic interaction between
permanent and/or induced dipoles
hydrophobic interactions -
correct answer ✅association of non polar molecules or groups
with each other in aqueous systems
4 non covalent interactions (weak) -
correct answer ✅ionic
hydrogen bonds
Van der Waals
,Principles of Biochemistry Exam 1 -
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
Hydrophobic
water molecule -
correct answer ✅can form 4 hydrogen bonds, hydrophilic
molecules, can be ionic or polar substances, readily dissolve in
water
water molecule -
correct answer ✅can form up to 4 hydrogen bonds, high boiling
point, melting point, heat of vaporization and surface tension
hydrophilic molecules -
correct answer ✅water loving molecules
hydrophilic molecules -
correct answer ✅water soluble molecules
ionizable (ionic) or polar groups -
correct answer ✅Water soluble molecules usually contain one or
more
,Principles of Biochemistry Exam 1 -
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
solvation spheres around ions -
correct answer ✅molecules that contain (+) or (-) ionic groups
interact with water and form ________ and are water soluble
salt -
correct answer ✅example of a salvation sphere
hydrogen bonds -
correct answer ✅the polar water molecules attract the negative
and positive areas on the polar molecules to form ______ which
makes it dissolve in water
hydrophilic molecules -
correct answer ✅ionic and polar substances readily dissolve in
water they are _______
polar groups -
correct answer ✅contain electronegative atoms (O,N,S) that give
rise to unequal sharing of electrons in the bonds
, Principles of Biochemistry Exam 1 -
Dr. Jiaxu Li Exam Actual Questions
and Answers 2026
hydrogen bond -
correct answer ✅this polarity of the bonds results in the ability to
______ ______ with other polar groups through partial charge
attraction
list some common polar groups in biomolecules -
correct answer ✅hydroxyl -OH
sulfhydryl -SH
amino -NH2
Carbonyl ( aldehyde) -COH
Carboxyl -COO-
Carbonyl ( Ketone) - CO-
common charges groups in biomolecules -
correct answer ✅Amino - NH3+
Carboxyl - COO-
Phosphoryl
hydrophobic -
correct answer ✅water-insoluble
