BIOD 210 Module 2 Exam (2026) | Portage Learning Genetics – Complete PDF Q&A with Verified Answers & Rationales

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,BIOD 210 Module 2 Exam | (2026) Genetics Exam

Questions | Portage (PDF)

1. Which enzyme synthesizes RNA primers during DNA

replication?

A) DNA polymerase III

B) Primase

C) Helicase

D) Ligase

Correct Answer: B

*Rationale: Primase is an RNA polymerase that creates

short RNA primers to provide a 3'-OH group for DNA

polymerase to initiate DNA synthesis.*



2. During transcription, the template strand of DNA is

read in which direction?

A) 5' to 3'

B) 3' to 5'

C) 5' to 5'

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,D) 3' to 3'

Correct Answer: B

Rationale: The template strand is antiparallel to the RNA

transcript, so RNA polymerase moves along the template

DNA strand from 3' to 5' direction.



3. A mutation that changes a single nucleotide but does

not change the encoded amino acid is called:

A) Missense mutation

B) Nonsense mutation

C) Silent mutation

D) Frameshift mutation

Correct Answer: C

Rationale: A silent mutation alters the DNA sequence but

due to codon degeneracy, the same amino acid is

incorporated.




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, 4. Which of the following best describes the role of tRNA in
k k k k k k k k k k




translation?
k




A) It carries genetic information from DNA to ribosome.
k k k k k k k




B) It catalyzes peptide bond formation.
k k k k




C) Ittransports amino acidstotheribosome.
k k k k k k




D) ItunwindsDNAfortranscription.
k k k k




k CorrectAnswer:C k k




Rationale: tRNA carries specific amino acids and matches them
k k k k k k k k




to codons on mRNA via its anticodon.
k k k k k k k




5. A bacterial operon contains:
k k k




A) Only structural genes
k k




B) Promoter, operator, and structural genes k k k k




C) Onlyregulatorygenes
k k




D) Introns and exons k k




k CorrectAnswer:B k k




Rationale: An operon includes a promoter, operator, and
k k k k k k k




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