And so if we take the DNA RNA complex and we increase the PH so we create a basic solution. The RNA will be hydrolyzed while the DNA will remain intact. And so after step three, we essentially isolate that individual strand of complementary DNA shown in red. Now the next step is to basically form that other strand, the complementary strand to this cDNA molecule. And before we actually add the DNA polymerase so that it can synthesize the complementary strand, we have to once again create a primer. The problem is we don't know what this sequence here is.