Specific coupling free nucleic acids (DNA Replication)

[PreMade]

What does "Specific coupling free nucleic acids" mean?

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[sazerac]

This website goes into a little more detail on the MCAT must-haves: http://mcat-review.org/molecular-biology-dna.php

Anyway, it refers to how during replication of DNA, polymerase makes sure a free G will attach to a C on the opened strand, and a T will attach to an A, etc. You know the concept by now, it's just worded funny.