BIOD 210 Genetics Module 3 Exam 2026 UPDATE 2026 Update • Verified Answers
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
BIOD 210 Genetics Module 3 Exam 2026 UPDATE
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
,BIOD 210 Genetics Module 3 Exam 2026 UPDATE 2026 Update • Verified Answers
Questions & Verified Answers
1. Which enzyme is responsible for unwinding the DNA double helix during replication?
A. DNA Polymerase III
B. Primase
C. DNA Ligase
D. Helicase
Answer: D
Rationale: Helicase breaks the hydrogen bonds between the nitrogenous bases to separate the two strands of
the DNA molecule. 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 which direction is a new DNA strand always synthesized?
A. 3’ to 5’
B. N-terminus to C-terminus
C. 5’ to 3’
D. Variable depending on the organism
Answer: C
Rationale: DNA polymerases can only add nucleotides to the 3’ end of a growing strand, meaning synthesis
occurs in the 5’ to 3’ direction. 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.
3. What is the function of Single-Strand Binding Proteins (SSBs)?
A. To prevent the separated DNA strands from re-annealing
B. To join Okazaki fragments
C. To synthesize RNA primers
D. To proofread the new DNA strand
Answer: A
Rationale: SSBs bind to the single strands of DNA to keep them stable and prevent them from snapping back
together before replication is complete. This is an important clinical concept because selecting the correct
answer (A) requires understanding both the pathophysiology and the practical nursing implications.
Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide accurate
patient education.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, BIOD 210 Genetics Module 3 Exam 2026 UPDATE 2026 Update • Verified Answers
4. The leading strand is synthesized ______ while the lagging strand is synthesized ______ .
A. discontinuously; continuously
B. in the nucleus; in the cytoplasm
C. continuously; discontinuously
D. using RNA; using DNA
Answer: C
Rationale: The leading strand follows the replication fork continuously, while the lagging strand must be made
in short segments called Okazaki fragments. 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.
5. Which enzyme replaces RNA primers with DNA nucleotides?
A. Telomerase
B. DNA Polymerase III
C. Topoisomerase
D. DNA Polymerase I
Answer: D
Rationale: DNA Polymerase I has exonuclease activity that allows it to remove the RNA primer and fill in the
gap with DNA. 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 (D)
requires understanding both the pathophysiology and the practical nursing implications.
6. What role does DNA Ligase play in replication?
A. It unwinds the DNA helix
B. It adds a poly-A tail to the transcript
C. It seals the gaps between DNA fragments by forming phosphodiester bonds
D. It creates the replication bubble
Answer: C
Rationale: Ligase acts as a molecular glue, joining Okazaki fragments on the lagging strand to create a
continuous DNA molecule. 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.
Exam (Elaborations) • Actual Questions & Rationales Page 3
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
BIOD 210 Genetics Module 3 Exam 2026 UPDATE
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
,BIOD 210 Genetics Module 3 Exam 2026 UPDATE 2026 Update • Verified Answers
Questions & Verified Answers
1. Which enzyme is responsible for unwinding the DNA double helix during replication?
A. DNA Polymerase III
B. Primase
C. DNA Ligase
D. Helicase
Answer: D
Rationale: Helicase breaks the hydrogen bonds between the nitrogenous bases to separate the two strands of
the DNA molecule. 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 which direction is a new DNA strand always synthesized?
A. 3’ to 5’
B. N-terminus to C-terminus
C. 5’ to 3’
D. Variable depending on the organism
Answer: C
Rationale: DNA polymerases can only add nucleotides to the 3’ end of a growing strand, meaning synthesis
occurs in the 5’ to 3’ direction. 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.
3. What is the function of Single-Strand Binding Proteins (SSBs)?
A. To prevent the separated DNA strands from re-annealing
B. To join Okazaki fragments
C. To synthesize RNA primers
D. To proofread the new DNA strand
Answer: A
Rationale: SSBs bind to the single strands of DNA to keep them stable and prevent them from snapping back
together before replication is complete. This is an important clinical concept because selecting the correct
answer (A) requires understanding both the pathophysiology and the practical nursing implications.
Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide accurate
patient education.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, BIOD 210 Genetics Module 3 Exam 2026 UPDATE 2026 Update • Verified Answers
4. The leading strand is synthesized ______ while the lagging strand is synthesized ______ .
A. discontinuously; continuously
B. in the nucleus; in the cytoplasm
C. continuously; discontinuously
D. using RNA; using DNA
Answer: C
Rationale: The leading strand follows the replication fork continuously, while the lagging strand must be made
in short segments called Okazaki fragments. 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.
5. Which enzyme replaces RNA primers with DNA nucleotides?
A. Telomerase
B. DNA Polymerase III
C. Topoisomerase
D. DNA Polymerase I
Answer: D
Rationale: DNA Polymerase I has exonuclease activity that allows it to remove the RNA primer and fill in the
gap with DNA. 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 (D)
requires understanding both the pathophysiology and the practical nursing implications.
6. What role does DNA Ligase play in replication?
A. It unwinds the DNA helix
B. It adds a poly-A tail to the transcript
C. It seals the gaps between DNA fragments by forming phosphodiester bonds
D. It creates the replication bubble
Answer: C
Rationale: Ligase acts as a molecular glue, joining Okazaki fragments on the lagging strand to create a
continuous DNA molecule. 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.
Exam (Elaborations) • Actual Questions & Rationales Page 3
