CHEM 210 Biochemistry Module 1 to 8
Exams' & Final Exam () Portage
Learning Questions and Verified Answers,
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CHEM 210 Biochemistry Comprehensive Practice
Exam
Part 1: Questions 1–50
Modules 1–2: Foundations of Biochemistry, Water, pH,
Buffers, Amino Acids, and Proteins
Module 1: Foundations of Biochemistry
1. Biochemistry is primarily the study of:
A. The physical structure of rocks
B. Chemical processes occurring in living organisms
C. Weather patterns
D. Astronomical phenomena
Answer: B
Rationale: Biochemistry focuses on the chemical reactions,
molecules, and pathways that support life.
2. The four major classes of biological macromolecules are:
,A. Vitamins, minerals, water, and salts
B. Proteins, carbohydrates, lipids, and nucleic acids
C. DNA, RNA, ATP, and enzymes
D. Glucose, amino acids, fatty acids, and cholesterol
Answer: B
Rationale: The major biomolecule groups are carbohydrates,
lipids, proteins, and nucleic acids.
3. The smallest unit capable of carrying out all functions of
life is the:
A. Atom
B. Molecule
C. Cell
D. Organelle
Answer: C
Rationale: Cells are the basic structural and functional units of
living organisms.
4. An element’s atomic number represents the number of:
A. Neutrons
B. Protons
C. Electrons plus neutrons
D. Energy levels
Answer: B
Rationale: Atomic number equals the number of protons in the
nucleus.
,5. Isotopes of an element differ in their number of:
A. Protons
B. Electrons only
C. Neutrons
D. Chemical properties completely
Answer: C
Rationale: Isotopes have the same number of protons but
different numbers of neutrons.
6. A covalent bond forms when atoms:
A. Transfer electrons
B. Share electrons
C. Exchange protons
D. Lose neutrons
Answer: B
Rationale: Covalent bonds involve sharing electron pairs
between atoms.
7. Ionic bonds are formed through:
A. Equal sharing of electrons
B. Attraction between oppositely charged ions
C. Hydrogen sharing
D. Peptide formation
, Answer: B
Rationale: Ionic bonds occur when charged particles attract each
other.
8. Hydrogen bonds are especially important in biology
because they:
A. Form strong permanent bonds between atoms
B. Help stabilize structures like DNA and proteins
C. Replace covalent bonds
D. Create ATP directly
Answer: B
Rationale: Hydrogen bonds stabilize biological structures while
remaining reversible.
9. Water is considered a polar molecule because:
A. It contains no electrons
B. Oxygen and hydrogen share electrons equally
C. It has an uneven distribution of charge
D. It cannot form hydrogen bonds
Answer: C
Rationale: Oxygen attracts electrons more strongly than
hydrogen, creating partial charges.
10. The ability of water molecules to stick to one another is
called:
Exams' & Final Exam () Portage
Learning Questions and Verified Answers,
100% Guaranteed Pass ||Complete A+ Guide
CHEM 210 Biochemistry Comprehensive Practice
Exam
Part 1: Questions 1–50
Modules 1–2: Foundations of Biochemistry, Water, pH,
Buffers, Amino Acids, and Proteins
Module 1: Foundations of Biochemistry
1. Biochemistry is primarily the study of:
A. The physical structure of rocks
B. Chemical processes occurring in living organisms
C. Weather patterns
D. Astronomical phenomena
Answer: B
Rationale: Biochemistry focuses on the chemical reactions,
molecules, and pathways that support life.
2. The four major classes of biological macromolecules are:
,A. Vitamins, minerals, water, and salts
B. Proteins, carbohydrates, lipids, and nucleic acids
C. DNA, RNA, ATP, and enzymes
D. Glucose, amino acids, fatty acids, and cholesterol
Answer: B
Rationale: The major biomolecule groups are carbohydrates,
lipids, proteins, and nucleic acids.
3. The smallest unit capable of carrying out all functions of
life is the:
A. Atom
B. Molecule
C. Cell
D. Organelle
Answer: C
Rationale: Cells are the basic structural and functional units of
living organisms.
4. An element’s atomic number represents the number of:
A. Neutrons
B. Protons
C. Electrons plus neutrons
D. Energy levels
Answer: B
Rationale: Atomic number equals the number of protons in the
nucleus.
,5. Isotopes of an element differ in their number of:
A. Protons
B. Electrons only
C. Neutrons
D. Chemical properties completely
Answer: C
Rationale: Isotopes have the same number of protons but
different numbers of neutrons.
6. A covalent bond forms when atoms:
A. Transfer electrons
B. Share electrons
C. Exchange protons
D. Lose neutrons
Answer: B
Rationale: Covalent bonds involve sharing electron pairs
between atoms.
7. Ionic bonds are formed through:
A. Equal sharing of electrons
B. Attraction between oppositely charged ions
C. Hydrogen sharing
D. Peptide formation
, Answer: B
Rationale: Ionic bonds occur when charged particles attract each
other.
8. Hydrogen bonds are especially important in biology
because they:
A. Form strong permanent bonds between atoms
B. Help stabilize structures like DNA and proteins
C. Replace covalent bonds
D. Create ATP directly
Answer: B
Rationale: Hydrogen bonds stabilize biological structures while
remaining reversible.
9. Water is considered a polar molecule because:
A. It contains no electrons
B. Oxygen and hydrogen share electrons equally
C. It has an uneven distribution of charge
D. It cannot form hydrogen bonds
Answer: C
Rationale: Oxygen attracts electrons more strongly than
hydrogen, creating partial charges.
10. The ability of water molecules to stick to one another is
called:
