In the Watson and Crick Model of DNA,the "Steps" of the Ladder

question 52

Multiple Choice

In the Watson and Crick model of DNA,the "steps" of the ladder are composed of

• A)sugars.
• B)a purine and a pyrimidine.
• C)two purines.
• D)two pyrimidines.
• E)a sugar and a phosphate molecule.

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