Biotechnology

DNA denaturation in PCR occurs at 94-95°C (or sometimes 98°C), where hydrogen bonds between DNA strands are broken, separating the double helix into single strands.

Taq polymerase, isolated from Thermus aquaticus, is the most widely used enzyme in PCR due to its heat stability and ability to synthesize DNA at high temperatures.

The annealing temperature typically ranges from 45-65°C and depends on the Tm (melting temperature) of the primers used. This temperature allows primers to bind specifically to target DNA.

WES captures and sequences exonic regions (~50 Mb) using targeted enrichment, reducing sequencing depth and cost while identifying 85-90% of disease-causing variants.

SYBR Green intercalates into double-stranded DNA and fluoresces. It is cost-effective and widely used in qPCR for gene expression studies and viral load detection.

The annealing temperature typically ranges from 50-65°C and depends on the primer's melting temperature (Tm). This allows primers to bind specifically to complementary sequences on the template DNA.

Taq DNA Polymerase (thermostable polymerase from Thermus aquaticus) is the standard enzyme used in PCR. It synthesizes DNA by adding nucleotides to the 3'-OH group of the growing strand.

ddNTPs (dideoxynucleotides) lack a 3'-OH group, causing chain termination when incorporated, generating DNA fragments of different lengths for sequencing.

Restriction enzymes are used in DNA cloning and digestion, not in PCR. PCR requires template DNA, primers, dNTPs, Taq polymerase, and buffer.

Standard PCR typically uses 25-35 cycles to achieve sufficient exponential amplification (2^n copies) without compromising specificity or introducing errors.