Test Bank For Molecular Biology of the
Cell, 7th Edition by Bruce Alberts,
Rebecca Heald Alexander Johnson,
Chapter 1-24
Molecular Biology of the Cell (Chapters 1–24)
Question 1
Which statement best describes the Cell Theory?
A. Cells arise spontaneously from nonliving matter.
B. All living organisms are composed of one or more cells.
C. DNA is found only in eukaryotes.
D. Viruses are cells.
Answer: B. All living organisms are composed of one or more cells.
Rationale: Cell Theory states that all organisms are made of cells and that cells are the basic
units of life.
Question 2
Which structure is found in both prokaryotic and eukaryotic cells?
A. Nucleus
B. Mitochondrion
C. Ribosome
D. Golgi apparatus
Answer: C. Ribosome
,Rationale: Ribosomes are universal structures responsible for protein synthesis.
Question 3
The genetic material of most organisms is:
A. Protein
B. RNA
C. DNA
D. Lipid
Answer: C. DNA
Rationale: DNA stores hereditary information in nearly all living organisms.
Question 4
Which domain contains organisms lacking a nucleus?
A. Eukarya
B. Animalia
C. Plantae
D. Bacteria
Answer: D. Bacteria
Rationale: Bacteria are prokaryotes and do not possess a membrane-bound nucleus.
Question 5
The plasma membrane is primarily composed of:
A. Carbohydrates only
B. Proteins only
C. Phospholipids and proteins
D. DNA and RNA
Answer: C. Phospholipids and proteins
Rationale: Cell membranes consist mainly of a phospholipid bilayer with embedded proteins.
,Chapter 2: Cell Chemistry and Bioenergetics
Question 6
Water is considered an excellent solvent because it is:
A. Nonpolar
B. Acidic
C. Polar
D. Hydrophobic
Answer: C. Polar
Rationale: Water's polarity enables it to dissolve many ionic and polar substances.
Question 7
The pH of a neutral solution is:
A. 0
B. 7
C. 10
D. 14
Answer: B. 7
Rationale: A neutral solution contains equal concentrations of hydrogen and hydroxide ions.
Question 8
ATP serves as the cell's primary:
A. Structural protein
B. Genetic material
C. Energy currency
D. Membrane lipid
Answer: C. Energy currency
, Rationale: ATP stores and transfers energy required for cellular processes.
Question 9
Enzymes function primarily by:
A. Raising activation energy
B. Lowering activation energy
C. Producing ATP directly
D. Destroying substrates
Answer: B. Lowering activation energy
Rationale: Enzymes speed reactions by reducing the energy barrier.
Question 10
Which bond is responsible for the unique properties of water?
A. Ionic bond
B. Covalent bond
C. Hydrogen bond
D. Peptide bond
Answer: C. Hydrogen bond
Rationale: Hydrogen bonding contributes to water's cohesion and high heat capacity.
Chapter 3: Proteins
Question 11
Proteins are polymers composed of:
A. Fatty acids
B. Monosaccharides
C. Amino acids
D. Nucleotides
Cell, 7th Edition by Bruce Alberts,
Rebecca Heald Alexander Johnson,
Chapter 1-24
Molecular Biology of the Cell (Chapters 1–24)
Question 1
Which statement best describes the Cell Theory?
A. Cells arise spontaneously from nonliving matter.
B. All living organisms are composed of one or more cells.
C. DNA is found only in eukaryotes.
D. Viruses are cells.
Answer: B. All living organisms are composed of one or more cells.
Rationale: Cell Theory states that all organisms are made of cells and that cells are the basic
units of life.
Question 2
Which structure is found in both prokaryotic and eukaryotic cells?
A. Nucleus
B. Mitochondrion
C. Ribosome
D. Golgi apparatus
Answer: C. Ribosome
,Rationale: Ribosomes are universal structures responsible for protein synthesis.
Question 3
The genetic material of most organisms is:
A. Protein
B. RNA
C. DNA
D. Lipid
Answer: C. DNA
Rationale: DNA stores hereditary information in nearly all living organisms.
Question 4
Which domain contains organisms lacking a nucleus?
A. Eukarya
B. Animalia
C. Plantae
D. Bacteria
Answer: D. Bacteria
Rationale: Bacteria are prokaryotes and do not possess a membrane-bound nucleus.
Question 5
The plasma membrane is primarily composed of:
A. Carbohydrates only
B. Proteins only
C. Phospholipids and proteins
D. DNA and RNA
Answer: C. Phospholipids and proteins
Rationale: Cell membranes consist mainly of a phospholipid bilayer with embedded proteins.
,Chapter 2: Cell Chemistry and Bioenergetics
Question 6
Water is considered an excellent solvent because it is:
A. Nonpolar
B. Acidic
C. Polar
D. Hydrophobic
Answer: C. Polar
Rationale: Water's polarity enables it to dissolve many ionic and polar substances.
Question 7
The pH of a neutral solution is:
A. 0
B. 7
C. 10
D. 14
Answer: B. 7
Rationale: A neutral solution contains equal concentrations of hydrogen and hydroxide ions.
Question 8
ATP serves as the cell's primary:
A. Structural protein
B. Genetic material
C. Energy currency
D. Membrane lipid
Answer: C. Energy currency
, Rationale: ATP stores and transfers energy required for cellular processes.
Question 9
Enzymes function primarily by:
A. Raising activation energy
B. Lowering activation energy
C. Producing ATP directly
D. Destroying substrates
Answer: B. Lowering activation energy
Rationale: Enzymes speed reactions by reducing the energy barrier.
Question 10
Which bond is responsible for the unique properties of water?
A. Ionic bond
B. Covalent bond
C. Hydrogen bond
D. Peptide bond
Answer: C. Hydrogen bond
Rationale: Hydrogen bonding contributes to water's cohesion and high heat capacity.
Chapter 3: Proteins
Question 11
Proteins are polymers composed of:
A. Fatty acids
B. Monosaccharides
C. Amino acids
D. Nucleotides
