Question:

If DNA is a ladder, the rungs (steps) are made of?

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A. sugar

B. phosphate groups

C. alternating sugar and phosphate groups

D. nitrogenous base pairs

E. none of the above

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  1. D?


  2. D

  3. D. nitrogenous base pairs

  4. D. The rungs of the ladder are made up of nitrogenous base pairs AKA nucleotides.

    C is incorrect...the SIDES are made up of alternating sugar and phosphate groups.

  5. C

    "The backbone of the DNA strand is made from alternating phosphate and sugar residues."
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