1. What is the role of telomeres in cell division?
A. To prevent mutations in DNA
B. To shorten with each cell division, limiting cell lifespan
C. To assist in DNA replication
D. To bind to centromeres during cell division
Answer: B) To shorten with each cell division, limiting cell lifespan
Rationale: Telomeres are protective caps on the ends of chromosomes.
Each time a cell divides, telomeres shorten, which limits the number of
divisions a cell can undergo.
2. Which of the following is an example of an enzyme-substrate
interaction?
A. The DNA double helix unwinding during replication
B. The binding of glucose to the cell membrane
C. The binding of lactose to the enzyme lactase
D. The synthesis of ATP in the mitochondria
Answer: C) The binding of lactose to the enzyme lactase
Rationale: In enzyme-substrate interactions, the substrate (e.g., lactose)
binds to the enzyme's active site, allowing the enzyme to catalyze a
specific chemical reaction.
,3. Which of the following is true about the light-independent reactions
of photosynthesis?
A. They occur in the mitochondria.
B. They require light to produce glucose.
C. They produce oxygen as a byproduct.
D. Th
Answer: D) They occur in the stroma of the chloroplast
Rationale: The light-independent reactions, also known as the Calvin
cycle, occur in the stroma of the chloroplast, where carbon fixation and
glucose production take place.
4. During which process is mRNA synthesized?
A. Translation
B. Transcription
C. Replication
D. Transformation
Answer: B) Transcription
Rationale: Transcription is the process by which messenger RNA
(mRNA) is synthesized from a DNA template.
5. Which of the following is a difference between prokaryotic and
eukaryotic cells?
A. Prokaryotic cells have a nucleus; eukaryotic cells do not.
, B. Eukaryotic cells have a cell membrane; prokaryotic cells do not.
C. Prokaryotic cells lack membrane-bound organelles; eukaryotic cells
have them.
D. Prokaryotic cells are larger than eukaryotic cells.
Answer: C) Prokaryotic cells lack membrane-bound organelles;
eukaryotic cells have them.
Rationale: Eukaryotic cells contain membrane-bound organelles (like
the nucleus), while prokaryotic cells lack these structures.
6. Which of the following best describes the function of ribosomal RNA
(rRNA)?
A. To carry genetic information
B. To assist in the synthesis of proteins
C. To bind to specific amino acids
D. To break down proteins
Answer: B) To assist in the synthesis of proteins
Rationale: Ribosomal RNA (rRNA) is a key component of ribosomes,
which are the sites of protein synthesis in the cell.
7. Which of the following best defines osmosis?
A. The movement of solutes from high to low concentration
B. The movement of water from low to high concentration of solute
C. The active transport of ions across a membrane
A. To prevent mutations in DNA
B. To shorten with each cell division, limiting cell lifespan
C. To assist in DNA replication
D. To bind to centromeres during cell division
Answer: B) To shorten with each cell division, limiting cell lifespan
Rationale: Telomeres are protective caps on the ends of chromosomes.
Each time a cell divides, telomeres shorten, which limits the number of
divisions a cell can undergo.
2. Which of the following is an example of an enzyme-substrate
interaction?
A. The DNA double helix unwinding during replication
B. The binding of glucose to the cell membrane
C. The binding of lactose to the enzyme lactase
D. The synthesis of ATP in the mitochondria
Answer: C) The binding of lactose to the enzyme lactase
Rationale: In enzyme-substrate interactions, the substrate (e.g., lactose)
binds to the enzyme's active site, allowing the enzyme to catalyze a
specific chemical reaction.
,3. Which of the following is true about the light-independent reactions
of photosynthesis?
A. They occur in the mitochondria.
B. They require light to produce glucose.
C. They produce oxygen as a byproduct.
D. Th
Answer: D) They occur in the stroma of the chloroplast
Rationale: The light-independent reactions, also known as the Calvin
cycle, occur in the stroma of the chloroplast, where carbon fixation and
glucose production take place.
4. During which process is mRNA synthesized?
A. Translation
B. Transcription
C. Replication
D. Transformation
Answer: B) Transcription
Rationale: Transcription is the process by which messenger RNA
(mRNA) is synthesized from a DNA template.
5. Which of the following is a difference between prokaryotic and
eukaryotic cells?
A. Prokaryotic cells have a nucleus; eukaryotic cells do not.
, B. Eukaryotic cells have a cell membrane; prokaryotic cells do not.
C. Prokaryotic cells lack membrane-bound organelles; eukaryotic cells
have them.
D. Prokaryotic cells are larger than eukaryotic cells.
Answer: C) Prokaryotic cells lack membrane-bound organelles;
eukaryotic cells have them.
Rationale: Eukaryotic cells contain membrane-bound organelles (like
the nucleus), while prokaryotic cells lack these structures.
6. Which of the following best describes the function of ribosomal RNA
(rRNA)?
A. To carry genetic information
B. To assist in the synthesis of proteins
C. To bind to specific amino acids
D. To break down proteins
Answer: B) To assist in the synthesis of proteins
Rationale: Ribosomal RNA (rRNA) is a key component of ribosomes,
which are the sites of protein synthesis in the cell.
7. Which of the following best defines osmosis?
A. The movement of solutes from high to low concentration
B. The movement of water from low to high concentration of solute
C. The active transport of ions across a membrane
