List of top Botany Questions on Molecular Biology asked in AP EAMCET

In DNA, the bond between the phosphate and hydroxyl group of sugar:

Arrange the following in correct order in polymerase chain reaction cycle: 
I Deannealing
II Denaturation
III Extension
IV Annealing 
 

Match the following list: 


 

Diagram represents central dogma of molecular biology. Choose the correct labelling of "X" and "Y":