A composite volcano is built up from alternate layers of ash and lava. It has steep sides because when it erupts it lava is thick and viscous (andesitic) meaning that it does not travel great distances and stays on the side of the volcano.An example is Mount Vesuvius (which destroyed Pompeii).onfidence votes 2.6K. A composite volcano is built up from alternate layers of ash and lava. It has steep sides because when it erupts it lava is thick and viscous (andesitic) meaning that it does not travel great distances and stays on the side of the volcano. An example is Mount Vesuvius (which destroyed Pompeii).
Primase is an enzyme that synthesizes short RNA sequences called primers. These primers serve as a starting point for DNA synthesis. Since primase produces RNA molecules, the enzyme is a type of RNA polymerase.Primase functions by synthesizing short RNA sequences that are complementary to a single-stranded piece of DNA, which serves as its template.ince primase produces RNA molecules, the enzyme is a type of RNA polymerase.
Well, fortunately, we do, and it's yet another enzyme. It's called RNA primase. The job of RNA primase is to make, or synthesize, a primer for replication to start. First, it waits for DNA helicase to open a replication fork. Then, it swings in behind helicase to lay down a primer.