BioChem 210 Exam Module 1
Questions and Ansẉers
2026\2027 update
1. Which of the following elements is most abundant in the human
body by mass?
A) Carbon
B) Hydrogen
C) Oxygen
D) Nitrogen
Answer: C
2. What type of chemical bond is primarily responsible for
connecting the backbone of DNA?
A) Peptide bonds
B) Phosphodiester bonds
C) Glycosidic bonds
D) Ester bonds
Answer: B
3. Water has a high specific heat. Which of the following best
explains this property?
A) Water is a nonpolar molecule.
B) Water forms extensive hydrogen bond networks.
C) Water has a low molecular weight.
D) Water dissociates into ions easily.
,Answer: B
4. Which of the following is a nonpolar covalent bond?
A) C-H
B) O-H
C) N-H
D) C=O
Answer: A
5. The hydrophobic effect is primarily driven by:
A) Strong attractions between nonpolar molecules.
B) A decrease in the entropy of surrounding water molecules.
C) An increase in the entropy of the system when water is released
from structured cages around hydrophobic molecules.
D) Ionic interactions between water and oils.
Answer: C
6. What is the pH of a solution with a hydrogen ion concentration of
1.0 × 10^-4 M?
A) 4.0
B) 10.0
C) -4.0
D) 0.4
Answer: A
, 7. Which functional group is characterized by a carbonyl group
bonded to a hydrogen atom?
A) Ketone
B) Aldehyde
C) Carboxyl
D) Hydroxyl
Answer: B
8. An amphipathic molecule possesses:
A) Only hydrophobic regions.
B) Only hydrophilic regions.
C) Both hydrophobic and hydrophilic regions.
D) A net charge of zero.
Answer: C
9. Which of the following functional groups can act as an acid by
donating a proton?
A) Amino group (-NH2)
B) Hydroxyl group (-OH)
C) Carboxyl group (-COOH)
D) Methyl group (-CH3)
Answer: C
10. The formation of a peptide bond is an example of which type of
reaction?
A) Oxidation
Questions and Ansẉers
2026\2027 update
1. Which of the following elements is most abundant in the human
body by mass?
A) Carbon
B) Hydrogen
C) Oxygen
D) Nitrogen
Answer: C
2. What type of chemical bond is primarily responsible for
connecting the backbone of DNA?
A) Peptide bonds
B) Phosphodiester bonds
C) Glycosidic bonds
D) Ester bonds
Answer: B
3. Water has a high specific heat. Which of the following best
explains this property?
A) Water is a nonpolar molecule.
B) Water forms extensive hydrogen bond networks.
C) Water has a low molecular weight.
D) Water dissociates into ions easily.
,Answer: B
4. Which of the following is a nonpolar covalent bond?
A) C-H
B) O-H
C) N-H
D) C=O
Answer: A
5. The hydrophobic effect is primarily driven by:
A) Strong attractions between nonpolar molecules.
B) A decrease in the entropy of surrounding water molecules.
C) An increase in the entropy of the system when water is released
from structured cages around hydrophobic molecules.
D) Ionic interactions between water and oils.
Answer: C
6. What is the pH of a solution with a hydrogen ion concentration of
1.0 × 10^-4 M?
A) 4.0
B) 10.0
C) -4.0
D) 0.4
Answer: A
, 7. Which functional group is characterized by a carbonyl group
bonded to a hydrogen atom?
A) Ketone
B) Aldehyde
C) Carboxyl
D) Hydroxyl
Answer: B
8. An amphipathic molecule possesses:
A) Only hydrophobic regions.
B) Only hydrophilic regions.
C) Both hydrophobic and hydrophilic regions.
D) A net charge of zero.
Answer: C
9. Which of the following functional groups can act as an acid by
donating a proton?
A) Amino group (-NH2)
B) Hydroxyl group (-OH)
C) Carboxyl group (-COOH)
D) Methyl group (-CH3)
Answer: C
10. The formation of a peptide bond is an example of which type of
reaction?
A) Oxidation
