Week 5 Microbiology Quiz (SCI 251) 2026 UPDATE |Nightin… 2026 Update • Verified Answers
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
Week 5 Microbiology Quiz (SCI 251) 2026 UPDATE
|Nightingale
Actual Exam Questions & Verified Answers
with Detailed Rationales
Document Type: Exam (Elaborations)
Academic Year:
Total Questions: 50 Multiple Choice
Includes: Correct Answers + Full Rationales
Status: Verified & Updated for 2026
Exam (Elaborations) • Actual Questions & Rationales Page 1
,Week 5 Microbiology Quiz (SCI 251) 2026 UPDATE |Nightin… 2026 Update • Verified Answers
Questions & Verified Answers
1. Which enzyme is responsible for synthesizing a short RNA primer to initiate DNA replication?
A. DNA Ligase
B. DNA Polymerase III
C. Primase
D. Helicase
Answer: C
Rationale: Primase is the enzyme that synthesizes the RNA primer required for DNA polymerase to begin
adding nucleotides. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical settings supports
safe, evidence-based practice and improves patient outcomes.
2. In DNA replication, which strand is synthesized continuously toward the replication fork?
A. Template strand
B. Lagging strand
C. Leading strand
D. Okazaki strand
Answer: C
Rationale: The leading strand is synthesized continuously in the 5’ to 3’ direction toward the replication fork.
Applying this knowledge in clinical settings supports safe, evidence-based practice and improves patient
outcomes. This is an important clinical concept because selecting the correct answer (C) requires
understanding both the pathophysiology and the practical nursing implications.
3. Which process involves the transfer of DNA from a donor to a recipient cell via a
bacteriophage?
A. Transformation
B. Transduction
C. Transcription
D. Conjugation
Answer: B
Rationale: Transduction is the process where bacterial DNA is moved from one cell to another by a virus
(bacteriophage). Recognizing this principle allows the nurse to prioritize care, anticipate complications, and
provide accurate patient education. Exam questions often test the ability to distinguish this concept from closely
related distractors, making a clear rationale essential for mastery.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, Week 5 Microbiology Quiz (SCI 251) 2026 UPDATE |Nightin… 2026 Update • Verified Answers
4. What is the role of DNA ligase in DNA replication?
A. To join Okazaki fragments together
B. To unwind the double helix
C. To add new nucleotides to the leading strand
D. To stabilize single-stranded DNA
Answer: A
Rationale: DNA ligase seals the gaps between Okazaki fragments on the lagging strand by forming
phosphodiester bonds. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical settings supports
safe, evidence-based practice and improves patient outcomes.
5. A mutation that results in a premature stop codon is known as a:
A. Silent mutation
B. Missense mutation
C. Nonsense mutation
D. Frameshift mutation
Answer: C
Rationale: A nonsense mutation changes a codon for an amino acid into a stop codon, terminating protein
synthesis early. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and
provide accurate patient education. Exam questions often test the ability to distinguish this concept from closely
related distractors, making a clear rationale essential for mastery.
6. Which molecule carries the genetic information from DNA to the ribosome?
A. tRNA
B. rRNA
C. mRNA
D. snRNA
Answer: C
Rationale: Messenger RNA (mRNA) carries the genetic code from the DNA in the nucleus (or nucleoid) to the
ribosome for translation. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical settings supports
safe, evidence-based practice and improves patient outcomes.
Exam (Elaborations) • Actual Questions & Rationales Page 3
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
Week 5 Microbiology Quiz (SCI 251) 2026 UPDATE
|Nightingale
Actual Exam Questions & Verified Answers
with Detailed Rationales
Document Type: Exam (Elaborations)
Academic Year:
Total Questions: 50 Multiple Choice
Includes: Correct Answers + Full Rationales
Status: Verified & Updated for 2026
Exam (Elaborations) • Actual Questions & Rationales Page 1
,Week 5 Microbiology Quiz (SCI 251) 2026 UPDATE |Nightin… 2026 Update • Verified Answers
Questions & Verified Answers
1. Which enzyme is responsible for synthesizing a short RNA primer to initiate DNA replication?
A. DNA Ligase
B. DNA Polymerase III
C. Primase
D. Helicase
Answer: C
Rationale: Primase is the enzyme that synthesizes the RNA primer required for DNA polymerase to begin
adding nucleotides. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical settings supports
safe, evidence-based practice and improves patient outcomes.
2. In DNA replication, which strand is synthesized continuously toward the replication fork?
A. Template strand
B. Lagging strand
C. Leading strand
D. Okazaki strand
Answer: C
Rationale: The leading strand is synthesized continuously in the 5’ to 3’ direction toward the replication fork.
Applying this knowledge in clinical settings supports safe, evidence-based practice and improves patient
outcomes. This is an important clinical concept because selecting the correct answer (C) requires
understanding both the pathophysiology and the practical nursing implications.
3. Which process involves the transfer of DNA from a donor to a recipient cell via a
bacteriophage?
A. Transformation
B. Transduction
C. Transcription
D. Conjugation
Answer: B
Rationale: Transduction is the process where bacterial DNA is moved from one cell to another by a virus
(bacteriophage). Recognizing this principle allows the nurse to prioritize care, anticipate complications, and
provide accurate patient education. Exam questions often test the ability to distinguish this concept from closely
related distractors, making a clear rationale essential for mastery.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, Week 5 Microbiology Quiz (SCI 251) 2026 UPDATE |Nightin… 2026 Update • Verified Answers
4. What is the role of DNA ligase in DNA replication?
A. To join Okazaki fragments together
B. To unwind the double helix
C. To add new nucleotides to the leading strand
D. To stabilize single-stranded DNA
Answer: A
Rationale: DNA ligase seals the gaps between Okazaki fragments on the lagging strand by forming
phosphodiester bonds. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical settings supports
safe, evidence-based practice and improves patient outcomes.
5. A mutation that results in a premature stop codon is known as a:
A. Silent mutation
B. Missense mutation
C. Nonsense mutation
D. Frameshift mutation
Answer: C
Rationale: A nonsense mutation changes a codon for an amino acid into a stop codon, terminating protein
synthesis early. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and
provide accurate patient education. Exam questions often test the ability to distinguish this concept from closely
related distractors, making a clear rationale essential for mastery.
6. Which molecule carries the genetic information from DNA to the ribosome?
A. tRNA
B. rRNA
C. mRNA
D. snRNA
Answer: C
Rationale: Messenger RNA (mRNA) carries the genetic code from the DNA in the nucleus (or nucleoid) to the
ribosome for translation. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical settings supports
safe, evidence-based practice and improves patient outcomes.
Exam (Elaborations) • Actual Questions & Rationales Page 3
