BIOS 251 Week 5 Quiz Exam 4 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which phase of the cell cycle involves DNA replication?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct answer: B
Rationale: S phase is when DNA synthesis occurs to prepare for cell
division.
2. Which checkpoint ensures the DNA is intact before replication?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: A
,Rationale: G1 checkpoint prevents damaged DNA from entering S
phase.
3. Which checkpoint ensures chromosomes are attached to
spindle fibers before anaphase?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: C
Rationale: The spindle assembly checkpoint prevents errors in
chromosome segregation.
4. Which enzyme unwinds the DNA double helix?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: B
Rationale: Helicase separates DNA strands to allow 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 on the lagging strand?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: C
Rationale: Ligase seals nicks between Okazaki fragments.
7. Which enzyme synthesizes RNA primers for DNA replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: D
Rationale: Primase makes short RNA primers for DNA polymerase
to extend.
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 processes proteins for secretion or
membrane targeting.
10. Which organelle synthesizes lipids?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct answer: B
Rationale: Smooth ER produces phospholipids and steroids.
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which phase of the cell cycle involves DNA replication?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct answer: B
Rationale: S phase is when DNA synthesis occurs to prepare for cell
division.
2. Which checkpoint ensures the DNA is intact before replication?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: A
,Rationale: G1 checkpoint prevents damaged DNA from entering S
phase.
3. Which checkpoint ensures chromosomes are attached to
spindle fibers before anaphase?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. S checkpoint
Correct answer: C
Rationale: The spindle assembly checkpoint prevents errors in
chromosome segregation.
4. Which enzyme unwinds the DNA double helix?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: B
Rationale: Helicase separates DNA strands to allow 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 on the lagging strand?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: C
Rationale: Ligase seals nicks between Okazaki fragments.
7. Which enzyme synthesizes RNA primers for DNA replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: D
Rationale: Primase makes short RNA primers for DNA polymerase
to extend.
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 processes proteins for secretion or
membrane targeting.
10. Which organelle synthesizes lipids?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct answer: B
Rationale: Smooth ER produces phospholipids and steroids.
