KHAEMENES ACADEMY · BIOLOGY 10 · WEEK 24 · DAY 01

Transcription: DNA to RNA

Explain how RNA polymerase uses one DNA strand as a template while preserving sequence direction and gene boundaries.

Safety, privacy and evidence boundary

Use fictional DNA/RNA/protein sequences and standard codon tables. Do not use personal genomic data or infer disease from sequence examples. Sequence exercises are educational models, not clinical interpretation.

Explicit science instruction

During transcription, RNA polymerase binds regulatory DNA and synthesizes RNA complementary to a template strand. RNA is built 5′→3′ while the template is read 3′→5′. The RNA sequence matches the coding DNA strand except that U replaces T.

Genes include more than protein-coding sequence: promoters, regulatory regions, untranslated regions, and RNA genes can also matter.

Vocabulary: transcription; RNA polymerase; template strand; coding strand; promoter; RNA; 5′; 3′.

Worked example with reasoning

Template DNA 3′-TAC GGA TTT-5′ produces RNA 5′-AUG CCU AAA-3′. The coding DNA would be 5′-ATG CCT AAA-3′. Directionality—not visual placement on the page—determines which strand is template.

Guided question

Why does RNA resemble the coding strand rather than the template strand?

Independent work

  1. Transcribe three fictional template sequences.
  2. Identify coding and template strands.
  3. Mark 5′/3′ ends.
  4. Explain promoter function without saying it is translated.

Misconception check

Transcription does not copy an entire chromosome into one RNA molecule; specific genes/regions are transcribed under regulatory control.

Formative understanding check

RNA from template 3′-AAA CGT-5′?

Worked response

5′-UUU GCA-3′.

Open-book formative practice only; not an official mastery attempt or grade.

Mentor evidence conference

Ask Archaemenes to challenge your information-flow model, sequence reasoning, data interpretation, and limitations.

Open Archaemenes

Teacher guidance

Foundation: use strand-direction arrows. Core: derive RNA from template and coding strands. Extended: compare promoter, transcribed region, and regulatory sequences in a gene model.

Preserve learning evidence

Keep sequence work, models, corrections, and limitations in the matching Week 24 evidence field.