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Q.
Primers are
Biotechnology : Principles and Processes
Solution:
Primers are small, 'chemically synthesised oligonucleotides that are complementary to the sequences present at $3'$ end of the template $DNA$. They hybridise to the target $DNA$ region, one to each strand of the double helix. These primers are oriented with their ends facing each other allowing synthesis of the $DNA$ towards one another.