Lesson 3.8.2.1.1

3.8.2.1.1 Non-translated DNA in the cell Quiz: AQA Biology, Unit 8

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.8.2.1.1, Non-translated DNA in the cell: 20 multiple choice questions for the AQA Biology (7402), Unit 8: The control of gene expression, written with Revision Ninja.

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The 20 questions

  1. What is true about most nuclear DNA in eukaryotic cells?

    • Circular
    • Translated into protein
    • Non-coding
    • Single-stranded

  2. What term describes the complete set of genetic material in an organism?

    • Codon
    • Transcriptome
    • Proteome
    • Genome

  3. What term describes the full range of proteins a cell can produce?

    • Exon
    • Proteome
    • Genome
    • Intron

  4. Which sequences are removed from pre-mRNA during splicing?

    • Exons
    • Promoters
    • Codons
    • Introns

  5. In eukaryotes, transcription produces which molecule before splicing?

    • tRNA
    • Ribosomal protein
    • Pre-mRNA
    • Polypeptide

  6. Which of the following is an example of non-coding eukaryotic DNA?

    • Non-coding repeats
    • Functional polypeptides
    • Exons
    • mRNA transcripts

  7. Which regions of eukaryotic DNA are transcribed but not translated?

    • Exons
    • Introns
    • Codons
    • Histones

  8. A gene is 1200 bases long and 400 bases are exons. What proportion of the gene is intron?

    • 40 per cent
    • 33 per cent
    • 80 per cent
    • 67 per cent

  9. Why does knowing an organism's genome not immediately reveal its proteome?

    • Absence of DNA
    • Presence of introns
    • Fixed protein levels
    • Lack of ribosomes

  10. What process removes non-coding introns from pre-mRNA to produce mature mRNA?

    • Splicing
    • Translation
    • Phosphorylation
    • Replication

  11. Which term describes non-coding DNA sequences that control the expression of other genes?

    • Exons
    • Structural genes
    • Regulatory sequence
    • Introns

  12. A gene has 5 exons totalling 600 bases and 4 introns totalling 900 bases. What is the length of the pre-mRNA produced?

    • 2100 bases
    • 1500 bases
    • 600 bases
    • 900 bases

  13. By which process are non-coding introns removed from pre-mRNA in eukaryotic cells?

    • Splicing
    • Translation
    • Replication
    • Transcription

  14. Which molecule is produced by transcription before splicing in eukaryotes?

    • Ribosomal RNA only
    • tRNA
    • Pre-mRNA
    • Polypeptide

  15. Why is predicting a proteome from a eukaryotic genome difficult?

    • Presence of introns
    • Lack of promoters
    • Absence of exons
    • High mutation rate

  16. A gene has three exons of 300, 250 and 150 bases and two introns of 400 and 500 bases. What percentage of the pre-mRNA remains in the mature mRNA?

    • 56 per cent
    • 19 per cent
    • 44 per cent
    • 81 per cent

  17. What main role do non-coding DNA sequences perform in eukaryotic cells?

    • Gene regulation
    • ATP production
    • Glucose storage
    • Protein synthesis

  18. Why can a single eukaryotic genome produce varying proteomes in different cells?

    • Differential gene expression
    • Gene deletion
    • Ribosome destruction
    • DNA sequence changes

  19. What are the protein-coding regions within a eukaryotic gene called?

    • Promoters
    • Exons
    • Introns
    • Terminators

  20. During which process are introns transcribed into pre-mRNA?

    • Translation
    • Replication
    • Splicing
    • Transcription

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