Skip to main content
A-LevelBiologyGas exchange9700/12 · May/June 2025 · Q341 Mark

How is most carbon dioxide transported in the blood?

Aas carbaminohaemoglobin
Bas carbonic acid
Cas hydrogencarbonate ions
Din solution in cytoplasm

✓ Correct answer

C: as hydrogencarbonate ions

Practise more questions on this topic

Oracle Prep sorts past-paper questions by topic, so you can drill Gas exchange and see which topics are most likely to come up next.

Sign up free →

About this question

Topic
Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source
A-Level Biology, May/June 2025 Paper 1 Variant 2, question 34.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

Related Biology questions

© 2026 Oracle Prep