DNA Structure and Replication

ID #1690

For a statement: "At the end of DNA replication, two DNA molecules are produced, each one consisting of a parental DNA strand and a new DNA strand. This process is known as..." Why wouldnt the answer be conservative replication, because this theory states that a completely new DNA strand is made and the parental strand is unchanged. Isn't this what the question asked for though?


As we learned in class on Monday, if DNA replication were fully conservative, then when one double helical molecule is replicated--resulting in two helices identical in sequence--one of those helices would be parental DNA in both strands, and the other helix would be newly-synthesized DNA in both strands. Since this is not what the question describes, it wouldn't be conservative replication. As a question of terminology, let's keep some things straight: a molecule of DNA is a double helix, which in turn is composed of two complementary strands. So the strand isn't the same as the molecule, unless we happened to be talking about a single-stranded nucleic acid like most RNA molecules.

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