How to Differentiate Between Poisonous Snakes and Non Poisonous Snakes. Some snakes harm their prey by injecting venom through their fangs; some of this venom can be harmful to humans, resulting in what we often think of as poisoning...
DNA polymerases cannot initiate DNA synthesis - they can only add on to an existing strand of DNA or RNA. The existing strand is said to prime DNA synthesis. RNA polymerases, however, can begin copying a parent strand with no primer - just as they do in transcription of genes. During DNA replication, RNA primers are produced by RNA polymerases in order to provide a starting point for DNA polymerases to extend from.
During DNA replication, a DNA polymerase, or the molecule response for making a DNA polymer, uses one of the DNA strands to make a complementary strand using the base pairing rules. Similarly, transcription also relays on the base pairing rules to make a corresponding RNA with a complementary sequence.