(i) Mention the number of primers required in each cycle of polymerase chain reaction (PCR). Write the role of primers and DNA polymerase in PCR.
(ii) Give the characteristic feature and source organism of the DNA polymeras, in PCR.

Explanation

### Step-by-Step Solution

**(i) Number of Primers Required in Each Cycle of PCR:**
In each cycle of the Polymerase Chain Reaction (PCR), two primers are required. These primers are known as the forward primer and the reverse primer.

**Role of Primers in PCR:**
Primers are short sequences of nucleotides that are complementary to the target DNA sequence. Their roles include:
- **Annealing:** Primers bind (anneal) to the specific regions of the single-stranded DNA during the annealing phase of PCR.
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