They then pull the two strands apart, allowing other enzymes to complete the replication. Without this first step, no DNA can be replicated. In this way, helicases are machines or, ...

The first step in DNA replication requires the assembly of a group of proteins called the Origin Recognition Complex (ORC). Researchers have determined how the ORC assembles during the cell ...

The rest must be produced by the fertilized egg in its first few steps of growth. Fruit flies make for stingy mothers, imparting only a portion of the genetic building blocks their offspring need ...