,Test Bank for Fundamentals of Biochemistry Life at the Molecular Level 5th Edition by Donald Voet,
Judith G. Voet, Charlotte W. Pratt
Chapter 1: Life, Cells and Thermodynamics
Multiple-Choice Questions (45 Questions)
1. Which elements account for more than 97% of the weight of most organisms?
A) C, H, N, Mg, O, S
B) C, H, O, N, P, S
C) C, H, N
D) Fe, C, H, O, N
E) Ca²⁺, K⁺, Na⁺, Mg²⁺, Cl⁻
Correct Answer: B
Rationale: The bulk of biological matter is composed primarily of six elements: carbon, hydrogen,
oxygen, nitrogen, phosphorus, and sulfur. These account for more than 97% of the weight of most
organisms .
2. Which of the following is the correct order from most simple to most complex?
A) Atom, molecule, organelle, macromolecule
B) Molecule, atom, macromolecule, organelle
C) Atom, macromolecule, tissue, organ
D) Tissue, cell, organ, macromolecule
E) Organelle, macromolecule, atom, molecule
Correct Answer: C
Rationale: The hierarchical organization of life proceeds from atoms → molecules → macromolecules →
organelles → cells → tissues → organs → organ systems → organism .
3. Which of the following best defines organic chemistry?
A) The study of compounds contained in organisms
B) The study of compounds containing organs
C) The study of compounds containing carbon and hydrogen and their derivatives
D) The study of compounds containing elements other than carbon
E) The study of inorganic compounds
Correct Answer: C
Rationale: Organic chemistry is defined as the study of compounds containing carbon and hydrogen and
their derivatives. Biochemistry applies these principles to living systems .
4. Which of the following is NOT a functional group?
A) Amino group
B) Protein
C) Alcohol group
,D) Carbonyl group
E) Sulfhydryl group
Correct Answer: B
Rationale: Protein is a macromolecule composed of amino acids, not a functional group. Functional
groups include amino, alcohol, carbonyl, carboxyl, sulfhydryl, and phosphate groups .
5. Which of the following statements regarding biomolecules is false?
A) They contain predominantly ionic bonds
B) They contain predominantly nonmetallic elements
C) Carbon is the key element
D) Specific stereoisomers are essential in most cases
E) They contain predominantly covalent bonds
Correct Answer: A
Rationale: Biomolecules contain predominantly covalent bonds, not ionic bonds. Carbon is the key
element, and specific stereoisomers are essential for biological function .
6. According to the Big Bang theory of the creation of the universe:
A) The universe has been getting cooler since its beginning
B) The initial explosion caused the creation of all of the elements of the periodic table
C) Carbon is the most abundant element in the universe
D) The earth could be no older than 1 billion years
E) The universe has been getting warmer since its beginning
Correct Answer: A
Rationale: The Big Bang theory posits that the universe has been expanding and cooling since its origin
approximately 13.8 billion years ago. Only light elements (H, He, Li) were formed initially; heavier
elements were formed later in stars .
7. How are the majority of elements thought to have been formed?
A) By thermonuclear reactions that normally take place in stars
B) In explosions of stars
C) By the action of cosmic rays outside the stars since the formation of the galaxy
D) All of the choices are true
E) By chemical reactions on early Earth
Correct Answer: D
Rationale: Most elements were formed through thermonuclear reactions in stars, in stellar explosions
(supernovae), and by cosmic ray interactions outside stars. All of these processes contribute to element
formation .
8. What is the study of chemical processes within living organisms called?
A) Organic chemistry
B) Biochemistry
C) Inorganic chemistry
D) Analytical chemistry
E) Physical chemistry
, Correct Answer: B
Rationale: Biochemistry is the study of the molecular basis of life, integrating principles from biology and
chemistry to understand the structure, function, and interactions of biological macromolecules .
9. Which of the following is a double helix composed of two polymers containing deoxyribose,
phosphate, and four nitrogenous bases?
A) RNA
B) Protein
C) DNA
D) Cellulose
E) Glycogen
Correct Answer: C
Rationale: DNA (deoxyribonucleic acid) is a double helix composed of two polymers containing
deoxyribose, phosphate, and the four nitrogenous bases adenine (A), guanine (G), cytosine (C), and
thymine (T) .
10. Which of the following is a single-stranded polymer made up of ribose, phosphate, and four
nitrogenous bases?
A) DNA
B) RNA
C) Protein
D) Lipid
E) Cellulose
Correct Answer: B
Rationale: RNA (ribonucleic acid) is a single-stranded polymer made up of ribose, phosphate, and four
nitrogenous bases: adenine (A), guanine (G), cytosine (C), and uracil (U) .
11. In DNA, adenine pairs with thymine, and guanine pairs with cytosine. This specific base pairing is
known as:
A) Watson-Crick base pairs
B) Chargaff's rules
C) Franklin pairing
D) Meselson-Stahl pairing
E) Hoogsteen pairing
Correct Answer: A
Rationale: Watson-Crick base pairs refer to the specific base pairing interactions in DNA where adenine
(A) pairs with thymine (T) and guanine (G) pairs with cytosine (C) .
12. The principle stating that genetic information flows from DNA to RNA via transcription and from RNA
to protein via translation is called:
A) Central Dogma
B) Genetic code
C) Translation theory
Judith G. Voet, Charlotte W. Pratt
Chapter 1: Life, Cells and Thermodynamics
Multiple-Choice Questions (45 Questions)
1. Which elements account for more than 97% of the weight of most organisms?
A) C, H, N, Mg, O, S
B) C, H, O, N, P, S
C) C, H, N
D) Fe, C, H, O, N
E) Ca²⁺, K⁺, Na⁺, Mg²⁺, Cl⁻
Correct Answer: B
Rationale: The bulk of biological matter is composed primarily of six elements: carbon, hydrogen,
oxygen, nitrogen, phosphorus, and sulfur. These account for more than 97% of the weight of most
organisms .
2. Which of the following is the correct order from most simple to most complex?
A) Atom, molecule, organelle, macromolecule
B) Molecule, atom, macromolecule, organelle
C) Atom, macromolecule, tissue, organ
D) Tissue, cell, organ, macromolecule
E) Organelle, macromolecule, atom, molecule
Correct Answer: C
Rationale: The hierarchical organization of life proceeds from atoms → molecules → macromolecules →
organelles → cells → tissues → organs → organ systems → organism .
3. Which of the following best defines organic chemistry?
A) The study of compounds contained in organisms
B) The study of compounds containing organs
C) The study of compounds containing carbon and hydrogen and their derivatives
D) The study of compounds containing elements other than carbon
E) The study of inorganic compounds
Correct Answer: C
Rationale: Organic chemistry is defined as the study of compounds containing carbon and hydrogen and
their derivatives. Biochemistry applies these principles to living systems .
4. Which of the following is NOT a functional group?
A) Amino group
B) Protein
C) Alcohol group
,D) Carbonyl group
E) Sulfhydryl group
Correct Answer: B
Rationale: Protein is a macromolecule composed of amino acids, not a functional group. Functional
groups include amino, alcohol, carbonyl, carboxyl, sulfhydryl, and phosphate groups .
5. Which of the following statements regarding biomolecules is false?
A) They contain predominantly ionic bonds
B) They contain predominantly nonmetallic elements
C) Carbon is the key element
D) Specific stereoisomers are essential in most cases
E) They contain predominantly covalent bonds
Correct Answer: A
Rationale: Biomolecules contain predominantly covalent bonds, not ionic bonds. Carbon is the key
element, and specific stereoisomers are essential for biological function .
6. According to the Big Bang theory of the creation of the universe:
A) The universe has been getting cooler since its beginning
B) The initial explosion caused the creation of all of the elements of the periodic table
C) Carbon is the most abundant element in the universe
D) The earth could be no older than 1 billion years
E) The universe has been getting warmer since its beginning
Correct Answer: A
Rationale: The Big Bang theory posits that the universe has been expanding and cooling since its origin
approximately 13.8 billion years ago. Only light elements (H, He, Li) were formed initially; heavier
elements were formed later in stars .
7. How are the majority of elements thought to have been formed?
A) By thermonuclear reactions that normally take place in stars
B) In explosions of stars
C) By the action of cosmic rays outside the stars since the formation of the galaxy
D) All of the choices are true
E) By chemical reactions on early Earth
Correct Answer: D
Rationale: Most elements were formed through thermonuclear reactions in stars, in stellar explosions
(supernovae), and by cosmic ray interactions outside stars. All of these processes contribute to element
formation .
8. What is the study of chemical processes within living organisms called?
A) Organic chemistry
B) Biochemistry
C) Inorganic chemistry
D) Analytical chemistry
E) Physical chemistry
, Correct Answer: B
Rationale: Biochemistry is the study of the molecular basis of life, integrating principles from biology and
chemistry to understand the structure, function, and interactions of biological macromolecules .
9. Which of the following is a double helix composed of two polymers containing deoxyribose,
phosphate, and four nitrogenous bases?
A) RNA
B) Protein
C) DNA
D) Cellulose
E) Glycogen
Correct Answer: C
Rationale: DNA (deoxyribonucleic acid) is a double helix composed of two polymers containing
deoxyribose, phosphate, and the four nitrogenous bases adenine (A), guanine (G), cytosine (C), and
thymine (T) .
10. Which of the following is a single-stranded polymer made up of ribose, phosphate, and four
nitrogenous bases?
A) DNA
B) RNA
C) Protein
D) Lipid
E) Cellulose
Correct Answer: B
Rationale: RNA (ribonucleic acid) is a single-stranded polymer made up of ribose, phosphate, and four
nitrogenous bases: adenine (A), guanine (G), cytosine (C), and uracil (U) .
11. In DNA, adenine pairs with thymine, and guanine pairs with cytosine. This specific base pairing is
known as:
A) Watson-Crick base pairs
B) Chargaff's rules
C) Franklin pairing
D) Meselson-Stahl pairing
E) Hoogsteen pairing
Correct Answer: A
Rationale: Watson-Crick base pairs refer to the specific base pairing interactions in DNA where adenine
(A) pairs with thymine (T) and guanine (G) pairs with cytosine (C) .
12. The principle stating that genetic information flows from DNA to RNA via transcription and from RNA
to protein via translation is called:
A) Central Dogma
B) Genetic code
C) Translation theory
