CHEM 210 Biochemistry Module 1 to 8 Exams' & Final
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CHEM 210 Biochemistry (Modules 1–8)
Comprehensive Practice Examination (Part 1)
Original Practice Exam
This is an original study resource designed to assess the same types of concepts typically covered
in an introductory college biochemistry course. It is not reproduced from any proprietary or
copyrighted examination.
Table of Contents
Section Content
I Introduction & Instructions
II Module 1 – Chemistry of Life
III Module 2 – Water, pH, and Buffers
IV Answer Key & Rationales (Part 1)
Introduction
Instructions
• Answer all questions.
• Multiple-choice questions have one best answer unless otherwise indicated.
• Short-answer questions should be answered using complete scientific explanations.
• Show calculations where required.
• Total Questions in Part 1: 35
,Section II
Module 1 – Chemistry of Life
Multiple Choice (Questions 1–15)
1. Which subatomic particle determines the identity of an element?
A. Electron
B. Neutron
C. Proton
D. Positron
Answer: C
Rationale: The number of protons (atomic number) uniquely identifies each element.
2. An atom gains two electrons. What happens?
A. It becomes positively charged.
B. It becomes negatively charged.
C. It becomes neutral.
D. It loses mass.
Answer: B
Rationale: Gaining electrons gives the atom a net negative charge.
3. Which bond results from unequal sharing of electrons?
A. Ionic
B. Nonpolar covalent
C. Polar covalent
D. Metallic
Answer: C
Rationale: Polar covalent bonds share electrons unequally because of differences in
electronegativity.
,4. Which element forms four covalent bonds?
A. Oxygen
B. Nitrogen
C. Carbon
D. Hydrogen
Answer: C
Rationale: Carbon has four valence electrons and commonly forms four covalent bonds.
5. Which interaction is the weakest?
A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Peptide bond
Answer: C
Rationale: Hydrogen bonds are much weaker than covalent or ionic bonds but are biologically
important.
6. What is the atomic number of an element equal to?
A. Protons
B. Electrons + neutrons
C. Neutrons
D. Mass number
Answer: A
Rationale: Atomic number equals the number of protons.
7. Isotopes differ in their number of:
, A. Electrons
B. Protons
C. Neutrons
D. Valence electrons
Answer: C
Rationale: Isotopes have identical proton numbers but different neutron numbers.
8. Which bond is formed after electron transfer?
A. Hydrogen
B. Covalent
C. Ionic
D. Peptide
Answer: C
Rationale: Ionic bonds result when electrons are transferred from one atom to another.
9. Which element is most electronegative?
A. Carbon
B. Hydrogen
C. Fluorine
D. Sodium
Answer: C
Rationale: Fluorine has the highest electronegativity.
10. Electrons occupy:
A. The nucleus
B. Orbitals
C. Neutrons
Exam () Portage Learning Questions and Verified
Answers, 100% Guarantee Pass
CHEM 210 Biochemistry (Modules 1–8)
Comprehensive Practice Examination (Part 1)
Original Practice Exam
This is an original study resource designed to assess the same types of concepts typically covered
in an introductory college biochemistry course. It is not reproduced from any proprietary or
copyrighted examination.
Table of Contents
Section Content
I Introduction & Instructions
II Module 1 – Chemistry of Life
III Module 2 – Water, pH, and Buffers
IV Answer Key & Rationales (Part 1)
Introduction
Instructions
• Answer all questions.
• Multiple-choice questions have one best answer unless otherwise indicated.
• Short-answer questions should be answered using complete scientific explanations.
• Show calculations where required.
• Total Questions in Part 1: 35
,Section II
Module 1 – Chemistry of Life
Multiple Choice (Questions 1–15)
1. Which subatomic particle determines the identity of an element?
A. Electron
B. Neutron
C. Proton
D. Positron
Answer: C
Rationale: The number of protons (atomic number) uniquely identifies each element.
2. An atom gains two electrons. What happens?
A. It becomes positively charged.
B. It becomes negatively charged.
C. It becomes neutral.
D. It loses mass.
Answer: B
Rationale: Gaining electrons gives the atom a net negative charge.
3. Which bond results from unequal sharing of electrons?
A. Ionic
B. Nonpolar covalent
C. Polar covalent
D. Metallic
Answer: C
Rationale: Polar covalent bonds share electrons unequally because of differences in
electronegativity.
,4. Which element forms four covalent bonds?
A. Oxygen
B. Nitrogen
C. Carbon
D. Hydrogen
Answer: C
Rationale: Carbon has four valence electrons and commonly forms four covalent bonds.
5. Which interaction is the weakest?
A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Peptide bond
Answer: C
Rationale: Hydrogen bonds are much weaker than covalent or ionic bonds but are biologically
important.
6. What is the atomic number of an element equal to?
A. Protons
B. Electrons + neutrons
C. Neutrons
D. Mass number
Answer: A
Rationale: Atomic number equals the number of protons.
7. Isotopes differ in their number of:
, A. Electrons
B. Protons
C. Neutrons
D. Valence electrons
Answer: C
Rationale: Isotopes have identical proton numbers but different neutron numbers.
8. Which bond is formed after electron transfer?
A. Hydrogen
B. Covalent
C. Ionic
D. Peptide
Answer: C
Rationale: Ionic bonds result when electrons are transferred from one atom to another.
9. Which element is most electronegative?
A. Carbon
B. Hydrogen
C. Fluorine
D. Sodium
Answer: C
Rationale: Fluorine has the highest electronegativity.
10. Electrons occupy:
A. The nucleus
B. Orbitals
C. Neutrons
