◈ Oracle PrepSign Up Free
A-LevelBiologyNucleic acids and protein synthesis9700/12 · Oct/Nov 2021 · Q221 Mark

A piece of a DNA molecule contains 84 base pairs. The table shows the number of adenine and cytosine bases in one or both of the DNA strands in this piece of DNA molecule. [Table showing base counts for adenine and cytosine in strand 1 and strand 2] How many guanine bases are present in this piece of DNA molecule?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A18
B33
C36
D41

✓ Correct answer

B: 33

Practise more questions on this topic

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

Sign up free →

About this question

Topic
Nucleic acids and protein synthesis, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source
A-Level Biology, Oct/Nov 2021 Paper 1 Variant 2, question 22.

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

Nucleic acids and protein synthesisFeb/Mar 20211m

What are the products when a DNA molecule replicates?

Nucleic acids and protein synthesisFeb/Mar 20221m

Some parts of a typical human chromosome are more numerous than others. Which parts are listed in order from the most…

Nucleic acids and protein synthesisFeb/Mar 20231m

What is present in all viruses?

Biological moleculesFeb/Mar 20191m

Four solutions were tested with Benedict's solution. The table shows the colour of the solutions after testing. [Tabl…

Biological moleculesFeb/Mar 20191m

Which feature of glycogen distinguishes glycogen from starch?

Biological moleculesFeb/Mar 20191m

A student wrote four statements about what happens during hydrolysis of a carbohydrate. 1 Disaccharides are formed fr…

← Browse all past-paper questions

© 2026 Oracle Prep