Answer the following question given this paragraph: 

When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance. The symbol "Δ" is often used to indicate that the reaction is to be heated.


Q: Which enzyme is used in step three of the polymerase chain reaction because of it's ability to withstand high temperatures?

 Choices:

- minocycline polymerase

- carbon polumerase

- backronym polymerase

- taq polymerase

A:
taq polymerase
