The reverse transcriptase is an enzyme which is used to (B) make DNA from RNA. It generates a complementary DNA from a RNA template and that is why it is called reverse transcriptase.
This is an instance of dramatic irony, taking into account that this figure of spech is when the implications of a situation, speech, etc, are understood by the audience but not by the characters in the play.
It isn't simile, because there is no comparison to anything, and it isn't ironic.
The Columbus Exchange was a very negative event that had many impacts on natives for what I can see. A very important and major impact this caused was a spread of a disease called smallpox. This disease infected many people part of their community as lead to death in many causing there population to decline quickly. People have even been said to believe that 90% of the natives who got infected with this disease died which can show that it was very deadly. Lucky we do not have to worry about this horrible disease.
