AQA A-LEVEL BIOLOGY COMPLETE QUESTIONS AND
ANSWERS WITH VERIFIED SOLUTION GRADE A+
1. What type of bonding holds the two strands of DNA together?
A. Hydrogen bonds
B. Ionic bonds
C. Covalent bonds
D. Disulfide bridges
Answer: A) Hydrogen bonds
Rationale: Hydrogen bonds hold the complementary nitrogenous bases
together in the DNA double helix structure.
2. Which of the following is a characteristic of prokaryotic cells?
A. Nucleus
B. Membrane-bound organelles
C. Circular DNA
D. Large size
Answer: C) Circular DNA
Rationale: Prokaryotic cells lack a nucleus and membrane-bound
organelles, and their DNA is typically circular and located in the
cytoplasm.
3. What is the role of the enzyme amylase?
A. Breaking down proteins
,B. Breaking down carbohydrates
C. Breaking down lipids
D. Breaking down nucleic acids
Answer: B) Breaking down carbohydrates
Rationale: Amylase is an enzyme that breaks down starches and other
carbohydrates into simple sugars.
4. Which of the following is a characteristic of asexual reproduction?
A. Involves two parents
B. Increases genetic diversity
C. Produces offspring genetically identical to the parent
D. Requires gametes
Answer: C) Produces offspring genetically identical to the parent
Rationale: Asexual reproduction involves one parent and produces
genetically identical offspring.
5. What is the primary role of the Golgi apparatus?
A. Protein synthesis
B. Packaging and modifying proteins
C. Lipid metabolism
D. Cellular respiration
Answer: B) Packaging and modifying proteins
, Rationale: The Golgi apparatus modifies, sorts, and packages proteins
for secretion or use within the cell.
6. The process by which a DNA molecule is copied to form two
identical molecules is called:
A. Replication
B. Transcription
C. Translation
D. Duplication
Answer: A) Replication
Rationale: DNA replication is the process by which a DNA molecule is
copied to produce two identical molecules, ensuring genetic material is
passed on during cell division.
7. Which molecule is used to carry energy in cells?
A. ATP
B. DNA
C. Glucose
D. Chlorophyll
Answer: A) ATP
Rationale: ATP (adenosine triphosphate) is the primary energy carrier
in cells.
8. Which of the following statements about enzymes is correct?
ANSWERS WITH VERIFIED SOLUTION GRADE A+
1. What type of bonding holds the two strands of DNA together?
A. Hydrogen bonds
B. Ionic bonds
C. Covalent bonds
D. Disulfide bridges
Answer: A) Hydrogen bonds
Rationale: Hydrogen bonds hold the complementary nitrogenous bases
together in the DNA double helix structure.
2. Which of the following is a characteristic of prokaryotic cells?
A. Nucleus
B. Membrane-bound organelles
C. Circular DNA
D. Large size
Answer: C) Circular DNA
Rationale: Prokaryotic cells lack a nucleus and membrane-bound
organelles, and their DNA is typically circular and located in the
cytoplasm.
3. What is the role of the enzyme amylase?
A. Breaking down proteins
,B. Breaking down carbohydrates
C. Breaking down lipids
D. Breaking down nucleic acids
Answer: B) Breaking down carbohydrates
Rationale: Amylase is an enzyme that breaks down starches and other
carbohydrates into simple sugars.
4. Which of the following is a characteristic of asexual reproduction?
A. Involves two parents
B. Increases genetic diversity
C. Produces offspring genetically identical to the parent
D. Requires gametes
Answer: C) Produces offspring genetically identical to the parent
Rationale: Asexual reproduction involves one parent and produces
genetically identical offspring.
5. What is the primary role of the Golgi apparatus?
A. Protein synthesis
B. Packaging and modifying proteins
C. Lipid metabolism
D. Cellular respiration
Answer: B) Packaging and modifying proteins
, Rationale: The Golgi apparatus modifies, sorts, and packages proteins
for secretion or use within the cell.
6. The process by which a DNA molecule is copied to form two
identical molecules is called:
A. Replication
B. Transcription
C. Translation
D. Duplication
Answer: A) Replication
Rationale: DNA replication is the process by which a DNA molecule is
copied to produce two identical molecules, ensuring genetic material is
passed on during cell division.
7. Which molecule is used to carry energy in cells?
A. ATP
B. DNA
C. Glucose
D. Chlorophyll
Answer: A) ATP
Rationale: ATP (adenosine triphosphate) is the primary energy carrier
in cells.
8. Which of the following statements about enzymes is correct?
