Lesson 3.4.1.1

3.4.1.1 DNA, genes, loci and chromosomes Quiz: AQA Biology, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.4.1.1, DNA, genes, loci and chromosomes: 20 multiple choice questions for the AQA Biology (7402), Unit 4: Genetic information, variation and relationships, written with Revision Ninja.

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The 20 questions

  1. What is a base sequence of DNA coding for a polypeptide or functional RNA called?

    • Gene
    • Codon
    • Genome
    • Intron

  2. What term describes the fixed position of a gene on a DNA molecule?

    • Allele
    • Locus
    • Centromere
    • Chiasma

  3. Which proteins associate with nuclear eukaryotic DNA to condense it into chromosomes?

    • Tubulins
    • Histones
    • Keratins
    • Actins

  4. How is DNA in mitochondria and chloroplasts structured?

    • Long and circular
    • Short and circular
    • Short and linear
    • Long and linear

  5. What does a sequence of three DNA bases code for in a polypeptide?

    • A monosaccharide
    • A nucleotide
    • A fatty acid
    • An amino acid

  6. Which combination of terms correctly describes the genetic code?

    • Degenerate, non-overlapping, species-specific
    • Degenerate, overlapping, universal
    • Degenerate, non-overlapping, universal
    • Redundant, overlapping, variable

  7. What term describes the fact that more than one triplet can code for one amino acid?

    • Non-overlapping
    • Universality
    • Degeneracy
    • Specificity

  8. What are the coding sections of a eukaryotic gene called?

    • Codons
    • Exons
    • Tripletes
    • Introns

  9. What are non-coding multiple repeats between genes in eukaryotic DNA?

    • Promoter sequences
    • Structural introns
    • Variable number tandem repeats
    • Functional RNA

  10. What term describes the specific fixed position of a gene on a chromosome?

    • Locus
    • Centromere
    • Allele
    • Genome

  11. What feature makes most eukaryotic nuclear DNA non-coding?

    • Histone removal
    • Circular structure
    • Introns and repeats
    • Codon degeneracy

  12. What do some genes code for other than polypeptides?

    • Amino acids
    • Fatty acids
    • Functional RNA
    • Monosaccharides

  13. A eukaryotic gene is 1200 base pairs long, and exons make up 600 of these base pairs. How many base pairs are in introns?

    • 600
    • 0
    • 300
    • 1200

  14. A coding strand has 60 bases and no stop codons. What is the maximum number of amino acids it could code for?

    • 60
    • 30
    • 20
    • 180

  15. What does the base sequence of a gene directly determine?

    • Fatty acid chain
    • Carbohydrate bond
    • Phosphate backbone
    • Amino acid sequence

  16. What property of the genetic code provides indirect evidence for evolution from a common ancestor?

    • Universal code
    • Non-overlapping code
    • Triplet code
    • Degenerate code

  17. Which protein is associated with nuclear DNA but absent in mitochondrial DNA?

    • Histone
    • DNA polymerase
    • Ribosome
    • RNA polymerase

  18. What do different alleles of the same gene at a specific locus differ in?

    • Chromosome number
    • Phosphate group
    • Sugar structure
    • Base sequence

  19. What property means each mRNA triplet is read separately without sharing bases with adjacent triplets?

    • Universal
    • Degenerate
    • Continuous
    • Non-overlapping

  20. A researcher finds that a gene is 900 base pairs long. What is the maximum number of codons it can contain?

    • 450
    • 900
    • 150
    • 300

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