Structure of DNA and RNA

Structure of DNA and RNA Quiz

Spec 3.1.5.1 · AQA A-Level Biology: Quiz

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5 questions, one answer each

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

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

  2. 2. A strand of 15 nucleotides is made by condensation reactions. How many phosphodiester bonds does it contain?

    • A. 15
    • B. 16
    • C. 30
    • D. 14

  3. 3. Which pairing is correct, with the number of hydrogen bonds?

    • A. Cytosine and guanine, three
    • B. Adenine and thymine, three
    • C. Adenine and guanine, two
    • D. Cytosine and thymine, three

  4. 4. In a double-stranded DNA sample, 18 % of the bases are thymine. What percentage are cytosine?

    • A. 18 %
    • B. 32 %
    • C. 64 %
    • D. 36 %

  5. 5. Why is mRNA able to leave the nucleus, but DNA is not?

    • A. mRNA is double-stranded
    • B. mRNA contains thymine
    • C. mRNA contains deoxyribose
    • D. mRNA is a relatively short single chain

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