The other object is a small charged sphere that is free to move (we neglect the force of. gravity on this sphere). According to Coulombâs law, these two like charges repel each. another. That is, the small sphere experiences a repulsive force away from the van de. Graaff sphere. Figure 2.2.2 (a) Two charges of the same sign that repel one another because of the. âstressesâ transmitted by electric fields.
Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (mRNA) by the enzyme RNA polymerase.
DNA Transcription. 1  RNA Polymerase Binds to DNA. 2  DNA is transcribed by an enzyme called RNA polymerase. 3  Specific nucleotide sequences tell RNA polymerase where to begin and where to end. 4  RNA polymerase attaches to the DNA at a specific area called the promoter region. 5  Elongation.