CHEM 210 Biochemistry Module 1 to 8 Exams & Final Exam (2025 /
2026) Portage Learning PRACTICE QUESTIONS |ORIGINAL
QUESTIONS & ANSWERS |DETAILED RATIONALES |HINTED
COMPLETE EXAM PREP GRADED A+*INSTANT DOWNLOAD PDF
Module 1 — Foundations of Biochemistry
1.
Which statement best describes biochemistry?
A. The study of geological processes
B. The study of chemical processes occurring in living organisms
,C. The study of planetary motion
D. The study of inorganic minerals only
Answer: B. The study of chemical processes occurring in living
organisms
Biochemistry examines the chemical substances and reactions that
occur within living systems.
2.
Which element is the central structural element of most biological
molecules?
A. Calcium
B. Sodium
C. Carbon
D. Iron
Answer: C. Carbon
Carbon can form four covalent bonds and create diverse chains, rings,
and three-dimensional structures.
3.
What type of bond involves sharing electrons between atoms?
A. Ionic bond
B. Covalent bond
C. Hydrogen bond
D. Peptide bond
Answer: B. Covalent bond
Covalent bonds form when atoms share pairs of electrons.
4.
Which bond results primarily from electrostatic attraction between
oppositely charged ions?
,A. Covalent
B. Hydrogen
C. Ionic
D. Peptide
Answer: C. Ionic
Ionic interactions occur between positively and negatively charged
ions.
5.
Which atom is generally the most electronegative?
A. Carbon
B. Hydrogen
C. Oxygen
D. Sodium
Answer: C. Oxygen
Oxygen strongly attracts shared electrons, making O–H and other
oxygen-containing bonds polar.
6.
A molecule containing polar covalent bonds will generally have:
A. Equal electron sharing in every bond
B. Unequal electron distribution
C. No charged regions
D. Only ionic bonds
Answer: B. Unequal electron distribution
Differences in electronegativity produce partial charges and
molecular polarity.
7.
, What is the primary importance of hydrogen bonding in biological
systems?
A. It creates all covalent bonds
B. It contributes to molecular structure and interactions
C. It destroys proteins
D. It prevents water from dissolving substances
Answer: B. It contributes to molecular structure and interactions
Hydrogen bonds help stabilize DNA, proteins, and interactions
involving water.
8.
Water is considered polar because:
A. It contains carbon
B. Its electrons are distributed unevenly
C. It contains ionic bonds
D. It has no hydrogen atoms
Answer: B. Its electrons are distributed unevenly
Oxygen attracts electrons more strongly than hydrogen, producing
partial charges.
9.
Which property of water helps stabilize body temperature?
A. Low heat capacity
B. High specific heat
C. Low polarity
D. Poor hydrogen bonding
Answer: B. High specific heat
Water absorbs substantial heat with relatively little temperature
change.
2026) Portage Learning PRACTICE QUESTIONS |ORIGINAL
QUESTIONS & ANSWERS |DETAILED RATIONALES |HINTED
COMPLETE EXAM PREP GRADED A+*INSTANT DOWNLOAD PDF
Module 1 — Foundations of Biochemistry
1.
Which statement best describes biochemistry?
A. The study of geological processes
B. The study of chemical processes occurring in living organisms
,C. The study of planetary motion
D. The study of inorganic minerals only
Answer: B. The study of chemical processes occurring in living
organisms
Biochemistry examines the chemical substances and reactions that
occur within living systems.
2.
Which element is the central structural element of most biological
molecules?
A. Calcium
B. Sodium
C. Carbon
D. Iron
Answer: C. Carbon
Carbon can form four covalent bonds and create diverse chains, rings,
and three-dimensional structures.
3.
What type of bond involves sharing electrons between atoms?
A. Ionic bond
B. Covalent bond
C. Hydrogen bond
D. Peptide bond
Answer: B. Covalent bond
Covalent bonds form when atoms share pairs of electrons.
4.
Which bond results primarily from electrostatic attraction between
oppositely charged ions?
,A. Covalent
B. Hydrogen
C. Ionic
D. Peptide
Answer: C. Ionic
Ionic interactions occur between positively and negatively charged
ions.
5.
Which atom is generally the most electronegative?
A. Carbon
B. Hydrogen
C. Oxygen
D. Sodium
Answer: C. Oxygen
Oxygen strongly attracts shared electrons, making O–H and other
oxygen-containing bonds polar.
6.
A molecule containing polar covalent bonds will generally have:
A. Equal electron sharing in every bond
B. Unequal electron distribution
C. No charged regions
D. Only ionic bonds
Answer: B. Unequal electron distribution
Differences in electronegativity produce partial charges and
molecular polarity.
7.
, What is the primary importance of hydrogen bonding in biological
systems?
A. It creates all covalent bonds
B. It contributes to molecular structure and interactions
C. It destroys proteins
D. It prevents water from dissolving substances
Answer: B. It contributes to molecular structure and interactions
Hydrogen bonds help stabilize DNA, proteins, and interactions
involving water.
8.
Water is considered polar because:
A. It contains carbon
B. Its electrons are distributed unevenly
C. It contains ionic bonds
D. It has no hydrogen atoms
Answer: B. Its electrons are distributed unevenly
Oxygen attracts electrons more strongly than hydrogen, producing
partial charges.
9.
Which property of water helps stabilize body temperature?
A. Low heat capacity
B. High specific heat
C. Low polarity
D. Poor hydrogen bonding
Answer: B. High specific heat
Water absorbs substantial heat with relatively little temperature
change.
