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Often we need to obtain the complementary strand of a DNA sequence.  As DNA is antiparallel, we really need the reverse complement sequence to keep our 5' and 3' ends properly oriented.  While this is easy to do manually with short sequences, for longer sequences computer programs are easier.

Original Sequence  5'ATGCAGGGGAAACATGATTCAGGAC 3'

Complement         3'TACGTCCCCTTTGTACTAAGTCCTG 5'

   (Pairs with Original Sequence, antiparallel)

Reverse Complement 5'GTCCTGAATCATGTTTCCCCTGCAT 3'

   (Complement sequence written 5' to 3')

You can easily generate a reverse complementary sequence if you are in Biology Workbench

The following program is also easy to use.  Just paste your sequence into the box and Submit the sequence.  The reverse complement sequence will be given.

http://bioinformatics.org/sms/rev_comp.html