Transcription and RNA Processing

Transcription and RNA Processing is topic 6.3 of AP Biology, inside Gene Expression and Regulation. This page works through three real practice questions on it, with the full reasoning behind each credited answer.

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51 questionsConcept Explanation45% with a figure
Worked examples

Three real transcription and rna processing questions

From the practice pool, not the mock papers — each with the reasoning that produces the answer.

45% of them come with a figure. Reading the graph or diagram correctly is most of the work here before any content knowledge applies.

71% test a single AP skill: Concept Explanation. That makes this topic unusually predictable to prepare for.

Concept Explanation

Which statement correctly describes transcription in a eukaryotic cell?

  1. ARibosomes copy proteins into DNA.
  2. BRNA polymerase makes RNA from a DNA templatecorrect
  3. CATP synthase converts mRNA into lipids.
  4. DAmino acids are joined directly on a DNA template.
Why B is correct

Transcription is the synthesis of RNA from a DNA template by RNA polymerase.

The stem asks students to explain a specific mechanism, not just recall a unit term: "Which statement correctly describes transcription in a eukaryotic cell". The correct choice is supported by Transcription is the synthesis of RNA from a DNA template by RNA polymerase. The tempting alternatives such as Ribosomes copy proteins into DNA or ATP synthase converts mRNA into lipids fail because they do not produce the same outcome described in the stem.

Concept Explanation

Which process removes introns from a eukaryotic pre-mRNA?

  1. AOsmosis
  2. BReplication
  3. CRNA splicingcorrect
  4. DTranslation
Why C is correct

RNA splicing removes introns and joins exons to produce a mature eukaryotic mRNA.

The stem asks students to explain a specific mechanism, not just recall a unit term: "Which process removes introns from a eukaryotic pre-mRNA". The correct choice is supported by RNA splicing removes introns and joins exons to produce a mature eukaryotic mRNA. The tempting alternatives such as Osmosis or Replication fail because they do not produce the same outcome described in the stem.

Argumentation

Two cell types contain the same gene but produce different mature mRNAs from it. Which explanation is best supported?

  1. AThe cells must have different genetic codes for the same codons.
  2. BAlternative splicing can create different mature mRNAscorrect
  3. COne cell type lacks DNA because only mRNA is present.
  4. DThe gene is translated directly into DNA in one cell type.
Why B is correct

Alternative splicing can process the same pre-mRNA in different ways, producing different mature mRNAs from the same gene.

The stem asks students to explain a specific mechanism, not just recall a unit term: "Two cell types contain the same gene but produce different mature mRNAs from it. Which explanation is best supported". The correct choice is supported by Alternative splicing can process the same pre-mRNA in different ways, producing different mature mRNAs from the same gene. The tempting alternatives such as cells must have different genetic codes for the same codons or One cell type lacks DNA because only mRNA is present fail because they do not produce the same outcome described in the stem.

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Last reviewed 2026-08-28. Topic and unit names follow the College Board course framework. Question counts describe the PrepScore practice bank, not the exam.
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Work transcription and rna processing until the reasoning is automatic.

Real AP questions with a full explanation on every answer, and a mistake bank that only clears when you get it right.

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