Test bank for Biochemistry: The Molecular Basis of Life 7th Edition by James R. McKee & Trudy McKee – Exam Practice MCQs with Answers | All Chapters | 2026–2027 Updated

Test Bank for Biochemistry: The Molecular Basis
of Life 7e Trudy McKee, James McKee
CHAPTER ONE
BIOCHEMISTRY: AN INTRODUCTION

1) The ultimate source of energy for life on earth is __________.

A) The sun
B) Geothermal heat
C) Carbohydrates
D) Fats
E) Other organisms

Ans A


2) Which of the following is not a common component of biomolecules?

A) Carbon
B) Hydrogen
C) Oxygen
D) Nitrogen
E) Chlorine

Ans E

3) Which of the following is the basic structural unit of living organisms?

A) Nucleus
B) Cell membrane
C) Tissue
D) Cell
E) Cytoskeleton

Ans D

4) Which of the following is not an organelle?

A) Mitochondria
B) Chloroplast
C) Nucleus
D) Plasma membrane
E) Golgi complex




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,Ans D


5) Which of the following is not a role played by carbohydrates in living cells?

A) Energy source
B) Structural support
C) Intercellular communication
D) Both A and B are correct
E) All are roles played by carbohydrates in living cells

Ans D

6) Metabolism is best defined as the _________.

A) Reactions of living cells
B) Reactions that synthesize large molecules in living cells
C) Reactions that degrade molecules in living cells
D) Conversion of food molecules to energy
E) Reactions that synthesize and degrade molecules in living cells

Ans E

7) The average life span of a species is about ________years

A) One million
B) Ten million
C) Five hundred thousand
D) Five million
E) One hundred thousand

Ans A


8) Which of the following is not a waste product of living organisms

A) Carbon dioxide
B) Water
C) Urea
D) Ammonia
E) Glycine

Ans E


9) Biochemistry is defined as




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,A) The study of life processes
B) The study of the molecular basis of life
C) The study of living organisms
D) The study of organic compounds in living organisms
E) The study of living compounds

Ans B

10) One of the principal methods that organisms use to obtain energy from chemical
bonds is by ___________.

A) Substitution reactions
B) Dehydration reactions
C) Oxidation/reduction reactions
D) Hydration reactions
E) Addition reactions

Ans C

11) The following is an example of which reaction class?

CH3Br + HSCH2CH(NH2)COOH → CH3SCH2CH(NH2)COOH + Br- + H+

A) Substitution
B) Elimination
C) Addition
D) Isomerization
E) Oxidation/Reduction

Ans A

12 The following is an example of which reaction class

HOOCCH=CHCOOH + H2O → HOOCCH2CH(OH)COOH

A) Substitution
B) Elimination
C) Addition
D) Isomerization
E) Oxidation/Reduction

Ans C


13) The following is an example of which reaction class?




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, CH3CH2OH → CH3CHO + H2O

A) Substitution
B) Elimination
C) Addition
D) Isomerization
E) Oxidation/Reduction

Ans E


14) Which of the following is not a component of nucleic acid?

A) Nucleotides
B) Glucose
C) Phosphate group
D) Purines
E) Pyrimidines

Ans B


15) The largest molecules in living organisms are _________.

A) proteins
B) lipids
C) nucleic acids
D) carbohydrates
E) steroids

Ans C


16) All of the following classes of compounds are lipids except _______.

A) fats
B) sterols
C) fatty acids
D) phosphoglycerides
E) nucleotides

Ans E


17) Which of the following classes of biomolecules are the most abundant in nature?




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