Test: GRE Subject Test: Biology

1.

Pick the reason that is least likely to explain why two purines will never be seen attached to each other in a DNA helix.

Purine bases will never be found on opposite DNA strands, so they do not have the ability to pair with one another.

The functional groups at the end of one purine would not correctly match with the other purine. 

Two purines could cause a bump in the DNA, causing problems with transcription and replication.

The bulky two-ring structure of purines would cause too much hindrance in the inside of the helix.

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