Calcified lesions called form in the lungs of patients with tb.

Calcified lesions called Ghon complexes form in the lungs of patients with TB.

Explanation:

Ghon Complex -

It is a lesion seen in lungs , which is due to the disease tuberculosis .

The composition of lesion is a Ghon focus and a pulmonary lymphadenopathy which is present near the pulmonary lymph node .

The Ghon complex persists the viable bacteria and , hence , making them the source of a long - time infection and which can again activate the secondary tuberculosis some time later in the life .

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."