Nucleotides, DNA structure and replication

Nucleotides, DNA structure and replication Quiz

Spec 2.5 · Edexcel A-Level Biology A: Quiz

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5 questions, one answer each

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  1. 1. Which bond joins nucleotides within one strand of DNA?

    • A. Hydrogen bond
    • B. Peptide bond
    • C. Phosphodiester bond
    • D. Ionic bond

  2. 2. Which base is found in RNA but not in DNA?

    • A. Thymine
    • B. Uracil
    • C. Cytosine
    • D. Guanine

  3. 3. DNA is 15% guanine. What percentage is thymine?

    • A. 15%
    • B. 30%
    • C. 35%
    • D. 70%

  4. 4. What does DNA polymerase do?

    • A. Breaks hydrogen bonds between the strands
    • B. Joins nucleotides to form the new strand
    • C. Carries amino acids
    • D. Joins the original strands again

  5. 5. After one generation in ¹⁴N, Meselson and Stahl's DNA was a single intermediate band. What does this show?

    • A. It supports the semi-conservative model and rejects the conservative model
    • B. It rejects the semi-conservative model
    • C. It supports the conservative model
    • D. It shows the DNA contained no nitrogen

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