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SACE Stage 2 · South Australia

Biology Scaling SACE 2026: Does It Scale Up or Down?

SATAC scales every SACE subject before an ATAR is calculated. The SATAC scaling report is the authority on what this subject did.

Does SACE Biology scale up or down?

SATAC scales every SACE subject before an ATAR is calculated.

SATAC does not publish a per-subject raw-to-scaled conversion for this course in a form we can quote exactly, so there is no figure on this page — the direction above is sourced from the SATAC scaling report linked below, and should be read as directional rather than numeric.

You can't change the scaling. You can change the raw mark.

Scaling is decided by your cohort, after the exam, and nothing you do moves it. The raw mark is the only part of this you control — and the Biology hub is 20 full-length model exams with mark-by-mark answer guides, revision notes, practice questions and flashcards, built for exactly that.

Preview Biology free →SATAC ATAR calculator

The hub shows a sample revision note extract, one full exam question with its worked answer and the complete list of every exam and note title — no account needed to look around. Unlocking Biology for life is $20 once, or $50 for any three subjects. See what's included →

What Biology actually asks of you

School assessment contributes 70%: the Investigations Folio is 30% and Skills and Applications Tasks are 40%. The externally assessed examination contributes 30% and lasts 130 minutes, with no separate reading period in the course model. It is an e-exam requiring interpretation of supplied sources and written explanations as well as multiple choice. These original practice papers use a 120-mark model: ten one-mark multiple-choice items and 110 marks of source-based written responses. The 2026 official notice confirms ten multiple-choice items, but this revised 10/110 total allocation is not verified as the official 2026 split.

The 5 areas of study you are examined on

From the Stage 2 Biology Subject Outline.

  • Topic 1: DNA and proteins
    Connect DNA structure and replication to inheritance, then follow information through transcription and translation. Explain how protein shape, enzyme activity and regulation affect cell function. Interpret mutation outcomes, DNA profiles and gene technologies through their actual molecular mechanisms.
    In the exam: Use supplied sequences, codon tables, experimental measurements and DNA-profile data. Explain the role of each molecule or process and evaluate gene-technology applications using evidence from the stated source.
    Where marks go missing: A base substitution does not necessarily cause a frameshift, and a matching profile does not by itself prove a unique identity or explain how a sample was deposited.
  • Topic 2: Cells as the basis of life
    Relate membranes and organelles to exchange, compartmentalisation and metabolism. Compare photosynthesis, respiration and fermentation at the required overall level. Track chromosomes through cell division and explain the controls and conditions needed for cells to function.
    In the exam: Interpret cell structures, transport scenarios, energy transformations and division models. Quantitative reasoning can include rates and surface-area-to-volume ratios, with assumptions and units stated.
    Where marks go missing: A transport protein does not automatically make transport active. DNA replication changes DNA quantity without necessarily changing the number of chromosome sets.
  • Topic 3: Homeostasis
    Use tolerance limits and stimulus–response pathways to explain regulation. Connect receptors, nervous and endocrine communication, and effectors in temperature, water, glucose and carbon-dioxide control.
    In the exam: Build causal feedback explanations from the specific disturbance to its correction. Interpret hormone or physiological time-course data and distinguish what was measured from what the mechanism predicts.
    Where marks go missing: Negative feedback means opposing the initial deviation, not a harmful response. A hormone circulating widely acts only where appropriate receptors and response machinery are present.
  • Topic 4: Evolution
    Use molecular, cellular and fossil evidence to evaluate relationships and possible origins of cells. Explain species boundaries, genetic variation, selection, drift and gene flow, then connect isolation and changing environments to divergence, succession and extinction risk.
    In the exam: Compare sequence data, interpret phylogenetic relationships and explain changes in population allele frequencies. Evaluate conservation proposals using biological mechanisms and their relevant social and environmental conditions.
    Where marks go missing: Individuals do not intentionally mutate because they need a trait. Similar adaptive features may reflect convergence, and geographical separation alone does not prove complete reproductive isolation.
  • Science Inquiry Skills
    Design a testable investigation, define variables operationally and justify controls, sampling and ethical measures. Analyse data with suitable representations and evaluate errors, uncertainty and the scope of conclusions.
    In the exam: Use the supplied source when identifying variables, interpreting trends or evaluating procedures. Science as a Human Endeavour responses connect the case to Communication and Collaboration, Development, Influence, or Application and Limitation.
    Where marks go missing: Repeated readings of one sample are not automatically independent biological replicates. Precision does not prove accuracy, and repeating a confounded method does not remove its confounding.

Full Biology study-design guide →

How scaling works in South Australia

In South Australia, the SACE Board reports a grade from A+ to E- for each Stage 2 subject and SATAC converts it into a scaled score out of 20 (out of 10 for a 10-credit subject). It does not scale the grade directly: the grade for each assessment type and the external result are turned into a raw score out of 15, weighted by their share of the subject, then scaled so that the same level of achievement counts comparably whichever subjects a student took. The university aggregate, out of 90, is built from your best 90 credits of scaled scores — your best three 20-credit subjects in full plus a flexible 30 credits from a fourth subject, half-scores, 10-credit subjects or recognised studies — and the ATAR is your rank on that aggregate. Scaling is recalculated every year from that year's cohort, so any published figure describes one past cohort only.

What scaling is not

Scaling is not a difficulty rating and it is not a bonus. It compares how the students in one subject performed across every other subject they took, so a subject moves because of its cohort, not because of the paper. The consequence is practical: you cannot scale your way out of a weak result. The only lever you control is the raw mark, and the fastest way to move that is full-length timed practice against the real exam format.

SACE Biology practice examsSATAC ATAR calculator

Questions

Does SACE Biology scale up or down?

SATAC scales every SACE subject before any ATAR is calculated. We do not publish a figure for this subject; the SATAC scaling report is the authority.

How does subject scaling work in South Australia?

In South Australia, the SACE Board reports a grade from A+ to E- for each Stage 2 subject and SATAC converts it into a scaled score out of 20 (out of 10 for a 10-credit subject). It does not scale the grade directly: the grade for each assessment type and the external result are turned into a raw score out of 15, weighted by their share of the subject, then scaled so that the same level of achievement counts comparably whichever subjects a student took. The university aggregate, out of 90, is built from your best 90 credits of scaled scores — your best three 20-credit subjects in full plus a flexible 30 credits from a fourth subject, half-scores, 10-credit subjects or recognised studies — and the ATAR is your rank on that aggregate. Scaling is recalculated every year from that year's cohort, so any published figure describes one past cohort only.

Should I choose Biology because of how it scales?

Scaling adjusts a whole cohort, not one student, so choosing a subject you will struggle in because it scales up is usually a worse trade than doing well in one that scales down. Check the prerequisites for the course you want first, then your interest and workload, and treat scaling as a tie-breaker. Scaling is also recalculated every year, so the figures in any report describe a past cohort rather than the year you are sitting.

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