BIOS 251 Week 5 Quiz Exam 2 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which phase of the cell cycle involves active DNA synthesis?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct answer: B
Rationale: S phase is when DNA replication occurs to prepare for
cell division.
2. Which phase checks DNA integrity before mitosis?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: B
,Rationale: G2 checkpoint ensures DNA is fully replicated and
undamaged.
3. Which checkpoint ensures chromosomes are properly attached
to spindle fibers?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: C
Rationale: The spindle assembly checkpoint prevents anaphase until
all chromosomes are aligned.
4. Which enzyme unwinds the DNA double helix?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: B
Rationale: Helicase separates the two DNA strands for replication.
5. Which enzyme synthesizes new DNA strands?
A. DNA polymerase
B. Helicase
,C. Ligase
D. Primase
Correct answer: A
Rationale: DNA polymerase adds nucleotides complementary to the
template strand.
6. Which enzyme joins Okazaki fragments?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: C
Rationale: DNA ligase seals gaps between Okazaki fragments on the
lagging strand.
7. Which enzyme synthesizes RNA primers?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: D
Rationale: Primase creates short RNA primers for DNA polymerase
to start replication.
, 8. Which organelle synthesizes proteins for secretion?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Ribosome
Correct answer: A
Rationale: Rough ER-bound ribosomes produce secretory proteins.
9. Which organelle modifies and packages proteins?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct answer: C
Rationale: Golgi apparatus modifies and sorts proteins for secretion
or membrane insertion.
10. Which organelle synthesizes lipids?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct answer: B
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which phase of the cell cycle involves active DNA synthesis?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct answer: B
Rationale: S phase is when DNA replication occurs to prepare for
cell division.
2. Which phase checks DNA integrity before mitosis?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: B
,Rationale: G2 checkpoint ensures DNA is fully replicated and
undamaged.
3. Which checkpoint ensures chromosomes are properly attached
to spindle fibers?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: C
Rationale: The spindle assembly checkpoint prevents anaphase until
all chromosomes are aligned.
4. Which enzyme unwinds the DNA double helix?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: B
Rationale: Helicase separates the two DNA strands for replication.
5. Which enzyme synthesizes new DNA strands?
A. DNA polymerase
B. Helicase
,C. Ligase
D. Primase
Correct answer: A
Rationale: DNA polymerase adds nucleotides complementary to the
template strand.
6. Which enzyme joins Okazaki fragments?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: C
Rationale: DNA ligase seals gaps between Okazaki fragments on the
lagging strand.
7. Which enzyme synthesizes RNA primers?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: D
Rationale: Primase creates short RNA primers for DNA polymerase
to start replication.
, 8. Which organelle synthesizes proteins for secretion?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Ribosome
Correct answer: A
Rationale: Rough ER-bound ribosomes produce secretory proteins.
9. Which organelle modifies and packages proteins?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct answer: C
Rationale: Golgi apparatus modifies and sorts proteins for secretion
or membrane insertion.
10. Which organelle synthesizes lipids?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct answer: B
