This 60-minute IB DP Biology lesson is for SL and HL students. Students define essential and non-essential amino acids by the body’s capacity to synthesize them; count possible sequences using explicit fixed-length, order and repetition assumptions; compare neutral protein-conformation models without inferring activity from appearance alone; interpret illustrative temperature and pH results measured after return to common conditions; explain denaturation without assuming that peptide bonds have been broken.

The teacher walkthrough provides phase timings, prompts and support; a separate answer key supports formative assessment.

Included: editable Word and PDF versions of the teacher walkthrough, student activity pack and separate answer key (six documents), plus supporting classroom figures.

Students build a justified structure-function explanation and complete an independent exit ticket. Fictional teaching data are clearly identified, and the dietary classification tasks require no personal dietary information or food examples.

Level: SL and HL. Scope: B1.2.3-B1.2.5. Lesson 2 of 4 in the B1.2 Proteins sequence.

Single-teacher classroom licence. Independently authored by The Science Shop; customer-file integrity and packaging audited.