BIOS 251 Week 5 Quiz Exam 1 (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: During S phase, DNA is replicated to ensure each
daughter cell receives a full set of chromosomes.
2. During which phase of mitosis do chromosomes align at the cell
equator?
A. Prophase
B. Metaphase
C. Anaphase
,D. Telophase
Correct answer: B
Rationale: Metaphase aligns chromosomes along the metaphase
plate, ensuring equal segregation.
3. Which phase of mitosis involves separation of sister
chromatids?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Correct answer: C
Rationale: During anaphase, sister chromatids are pulled to
opposite poles by spindle fibers.
4. In which phase of mitosis does the nuclear envelope reform?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Correct answer: D
Rationale: Telophase re-establishes the nuclear envelope around
separated chromosomes.
,5. Which enzyme unwinds the DNA double helix during
replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: B
Rationale: Helicase unwinds DNA strands to allow replication to
proceed.
6. Which enzyme synthesizes RNA primers for DNA replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: D
Rationale: Primase synthesizes short RNA primers required for
DNA polymerase to start replication.
7. Which enzyme joins Okazaki fragments on the lagging strand?
A. DNA polymerase
B. Helicase
C. Ligase
, D. Primase
Correct answer: C
Rationale: DNA ligase seals gaps between Okazaki fragments to
create a continuous strand.
8. 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.
9. Which type of RNA carries amino acids to the ribosome?
A. mRNA
B. tRNA
C. rRNA
D. snRNA
Correct answer: B
Rationale: tRNA brings specific amino acids to the ribosome for
protein synthesis.
10. Which RNA forms the core of ribosome structure?
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: During S phase, DNA is replicated to ensure each
daughter cell receives a full set of chromosomes.
2. During which phase of mitosis do chromosomes align at the cell
equator?
A. Prophase
B. Metaphase
C. Anaphase
,D. Telophase
Correct answer: B
Rationale: Metaphase aligns chromosomes along the metaphase
plate, ensuring equal segregation.
3. Which phase of mitosis involves separation of sister
chromatids?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Correct answer: C
Rationale: During anaphase, sister chromatids are pulled to
opposite poles by spindle fibers.
4. In which phase of mitosis does the nuclear envelope reform?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Correct answer: D
Rationale: Telophase re-establishes the nuclear envelope around
separated chromosomes.
,5. Which enzyme unwinds the DNA double helix during
replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: B
Rationale: Helicase unwinds DNA strands to allow replication to
proceed.
6. Which enzyme synthesizes RNA primers for DNA replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct answer: D
Rationale: Primase synthesizes short RNA primers required for
DNA polymerase to start replication.
7. Which enzyme joins Okazaki fragments on the lagging strand?
A. DNA polymerase
B. Helicase
C. Ligase
, D. Primase
Correct answer: C
Rationale: DNA ligase seals gaps between Okazaki fragments to
create a continuous strand.
8. 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.
9. Which type of RNA carries amino acids to the ribosome?
A. mRNA
B. tRNA
C. rRNA
D. snRNA
Correct answer: B
Rationale: tRNA brings specific amino acids to the ribosome for
protein synthesis.
10. Which RNA forms the core of ribosome structure?
