Year 12 ACT Biology sample questions

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Year 12 ACT Biology practice questions

Use this no-login public demo to preview Skill Align's Year 12 ACT Biology sample questions, explanations, exercise mode, and test mode before regular practice.

Sample-question focus

Try a short public sample of Year 12 ACT Biology questions selected from the reviewed Skill Align demo set.

Skills covered

Practice cells, living systems, ecosystems, genetics, evolution, biodiversity, disease, biotechnology, and scientific inquiry.

Exercise and test mode

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Curriculum link

Compare this demo with the ACT Year 11-12 Biology curriculum page to scan related topics, subtopics, and pathway coverage.

View ACT Year 11-12 Biology curriculum coverage Browse all sample question demos

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Sample practice questions

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practice ACT Year 12 Biology practice questions Molecular biology hard protein-synthesis diagram

1. The diagram shows DNA being transcribed into mRNA before translation. Which molecule carries the code to the ribosome?

Choices

mRNA
Cellulose
Insulin only
Starch

Explanation:

mRNA carries a transcribed copy of the genetic code from DNA to the ribosome.

practice ACT Year 12 Biology practice questions Genetics hard Punnett square

2. A Punnett square shows Hh x hh. What proportion of offspring are expected to be heterozygous?

Choices

Explanation:

The Hh parent can pass H or h, and the hh parent passes h. Half the offspring are Hh.

practice ACT Year 12 Biology practice questions Disease hard disease-spread graph

3. A disease graph shows case numbers flattening after contact tracing begins. Which effect best explains the graph?

Choices

Transmission chains were interrupted.
Genes stopped replicating in all cells.
The pathogen became a food web.
All hosts lost antibodies.

Explanation:

Contact tracing can reduce onward spread by identifying and isolating contacts.

practice ACT Year 12 Biology practice questions Immune response hard immune-response graph

4. The immune diagram shows a pathogen being engulfed and its antigen presented to other immune cells. Which process is represented?

Choices

Antigen presentation
Osmosis
Protein denaturation only
Carrying capacity

Explanation:

Some immune cells engulf pathogens and present antigen fragments to help activate specific immune responses.

practice ACT Year 12 Biology practice questions Biotechnology hard DNA gel diagram

5. A gel diagram shows lane 3 sharing all key bands with the reference sample. Which lane is the strongest match?

Choices

Lane 3
Lane 1
Lane 2
The ladder only

Explanation:

Matching band positions indicate the strongest DNA profile match.

practice ACT Year 12 Biology practice questions Evolution hard selection graph

6. An allele-frequency graph shows allele q decreasing from 0.60 to 0.35. What is directly supported?

Choices

Allele q became less common.
Allele q became fixed.
All alleles disappeared.
The graph shows only osmosis.

Explanation:

The plotted frequency falls over generations, so allele q became less common in the population.

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Practice Summary

Year 12 · ACT Biology · Test mode · 9 questions · 10 min

Questions attempted 0 / 9

Correct answers Pending

Score -

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ACT Biology practice questions FAQ

Does this page include Year 12 ACT Biology practice questions?

Yes. This public demo includes reviewed Year 12 ACT Biology sample questions so families can preview the Skill Align practice style before regular use.

Can students try the demo without signing up?

Yes. The public demo can be opened without signing up, and the attempt stays in the page instead of being saved to a student record.

How does this demo relate to curriculum coverage?

This demo is linked with the ACT Year 11-12 Biology curriculum coverage page, where parents can compare the broader topic and pathway structure used for Skill Align practice.