A fertilized egg is called a zygote until it divides into 16 cells, forming a ball-shaped structure called a morula. The events during the zygote stage involve the integration of both parents' DNA into the cell nucleus and the beginning of rapid cell division, or cleavage.
<span>Carbon, Hydrogen, Nitrogen, and oxygen </span>
<em>DNA</em><em> </em>is what carries the genetic code for living organisms it contained in the nucleus of cells.
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The role of an enzyme is to B change the activation energy of the reaction. Specifically, they increase the general speed of all reactions and are made of proteins.
