Explain briefly
a. PCR
b. Restriction enzymes and DNA
c. Chitinase

Explanation

a. The in vitro amplification of DNA by repeated cycles of strand separation and polymerisation is PCR.
b. The nuclease enzyme that cuts the DNA at a unique sequence is called restriction endonuclease. They are also known as molecular knives, molecular scissors or molecular scalpels.
c. Chitinase are digestive enzymes that break down glycsidic bones in chitin.