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9th -



This passage is adapted from J. D. Watson and F. H. C. Crick


10 questions

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  • 1. Multiple Choice
    2 minutes
    1 pt

    The authors use the word “backbone” in lines 3 and 39 to indicate that

    only very long chains of DNA can be taken from an organism with a spinal column

    the main structure of a chain in a DNA molecule is composed of repeating units.

    a chain in a DNA molecule consists entirely of phosphate groups or of sugars.

    nitrogenous bases form the main structural unit of DNA.

  • 2. Multiple Choice
    2 minutes
    1 pt

    A student claims that nitrogenous bases pair randomly with one another. Which of the following statements in the passage contradicts the student’s claim?

    Lines 5-6 (“To each... types”)

    Lines 9-10 (“So far... irregular”)

    Lines 23-25 (“The bases... other”)

    Lines 27-29 (“One member... chains”)

  • 3. Multiple Choice
    2 minutes
    1 pt

    In the second paragraph (lines 12-19), what do the authors claim to be a feature of biological interest?

    The chemical formula of DNA

    The common fiber axis

    The X-ray evidence

    DNA consisting of two chains

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