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Anup Padwal
To understand this concept you have to know about hybridization. This consept is always related to two strands. here you can consider a mRNA sequece if it is exactly same as any DNA that DNA is sense because due to same sequence it cannot hybridize. if DNA has exactly opposite or complimentary sequence i.e in place of Adenine Thymine and inplace of Cytocine Guanine it can consider as Antisense strand. Same about mRNA and rRNA.