Portage Learning Microbiology
BIOD 171 | Module 4 Exam |
Questions & Verified Answers | A+
Graded | 2025/2026 Edition
Section 1: Introduction
This document provides the verified Module 4 Exam for BIOD 171 – Microbiology from
Portage Learning, updated for the 2025/2026 academic cycle. It explores microbial genetics,
including DNA replication, gene expression, and mutation. All questions include 100%
accurate answers, A+ graded, to strengthen genetic understanding.
Section 2: Exam Questions and Answers
Format: Multiple-choice questions
• Four answer choices per question (A–D)
• Correct answer highlighted
• Includes clarifying notes where applicable
1. What is the primary component of a chromosome?
(a) RNA
(b) DNA
(c) Protein
(d) Lipid
DNA
Note: DNA carries genetic information.
2. Which enzyme unwinds DNA during replication?
(a) DNA polymerase
(b) Helicase
(c) Ligase
(d) Primase
Helicase
Note: Breaks hydrogen bonds between DNA strands.
3. What is the role of DNA polymerase?
(a) Unwinds DNA
(b) Synthesizes new DNA
(c) Seals nicks
, (d) Adds RNA primers
Synthesizes new DNA
Note: Adds nucleotides to the growing strand.
4. Which molecule serves as a primer in DNA replication?
(a) DNA
(b) RNA
(c) Protein
(d) Lipid
RNA
Note: RNA primase synthesizes short RNA segments.
5. What is the function of ligase in DNA replication?
(a) Unwinds DNA
(b) Joins Okazaki fragments
(c) Adds nucleotides
(d) Removes primers
Joins Okazaki fragments
Note: Seals nicks in the lagging strand.
6. Which process copies DNA before cell division?
(a) Transcription
(b) Translation
(c) Replication
(d) Mutation
Replication
Note: Ensures genetic material is duplicated.
7. What is the role of the leading strand in replication?
(a) Synthesized discontinuously
(b) Synthesized continuously
(c) Requires no primer
(d) Forms Okazaki fragments
Synthesized continuously
Note: Synthesized in the 5’ to 3’ direction.
8. What are Okazaki fragments?
(a) RNA primers
(b) Discontinuous DNA segments
BIOD 171 | Module 4 Exam |
Questions & Verified Answers | A+
Graded | 2025/2026 Edition
Section 1: Introduction
This document provides the verified Module 4 Exam for BIOD 171 – Microbiology from
Portage Learning, updated for the 2025/2026 academic cycle. It explores microbial genetics,
including DNA replication, gene expression, and mutation. All questions include 100%
accurate answers, A+ graded, to strengthen genetic understanding.
Section 2: Exam Questions and Answers
Format: Multiple-choice questions
• Four answer choices per question (A–D)
• Correct answer highlighted
• Includes clarifying notes where applicable
1. What is the primary component of a chromosome?
(a) RNA
(b) DNA
(c) Protein
(d) Lipid
DNA
Note: DNA carries genetic information.
2. Which enzyme unwinds DNA during replication?
(a) DNA polymerase
(b) Helicase
(c) Ligase
(d) Primase
Helicase
Note: Breaks hydrogen bonds between DNA strands.
3. What is the role of DNA polymerase?
(a) Unwinds DNA
(b) Synthesizes new DNA
(c) Seals nicks
, (d) Adds RNA primers
Synthesizes new DNA
Note: Adds nucleotides to the growing strand.
4. Which molecule serves as a primer in DNA replication?
(a) DNA
(b) RNA
(c) Protein
(d) Lipid
RNA
Note: RNA primase synthesizes short RNA segments.
5. What is the function of ligase in DNA replication?
(a) Unwinds DNA
(b) Joins Okazaki fragments
(c) Adds nucleotides
(d) Removes primers
Joins Okazaki fragments
Note: Seals nicks in the lagging strand.
6. Which process copies DNA before cell division?
(a) Transcription
(b) Translation
(c) Replication
(d) Mutation
Replication
Note: Ensures genetic material is duplicated.
7. What is the role of the leading strand in replication?
(a) Synthesized discontinuously
(b) Synthesized continuously
(c) Requires no primer
(d) Forms Okazaki fragments
Synthesized continuously
Note: Synthesized in the 5’ to 3’ direction.
8. What are Okazaki fragments?
(a) RNA primers
(b) Discontinuous DNA segments
