Biology
Biology, 17.12.2019 11:31, cristykianpour

In the watson-crick model of a double helix, the "steps" of the "spiral staircase" are composed of:

a- sugars
b- nitrogen bases
c- phosphates

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In the watson-crick model of a double helix, the "steps" of the "spiral staircase" are composed of:...

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