In reply to babanrosesalluri5:
I could not understand your question correctly, So let me explain two things to help:
Normal sequences always require a sequencer to run on. For example on this you can look at:
http://cluelogic.com/2011/07/uvm-tutorial-for-candy-lovers-transactions-and-sequences/
Virtual Sequences does not necessarily requires sequencer.Example is in my previous solution.