TLS Online TPP Program

#Question id: 13057


Precision will be reduced, but yield will be increased
Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.
How primer concentration leads to decrease in PCR efficiency?

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology
  1. Primer concentration decreases with time
  2. Binding specificity of the primer reduces over cycles
  3. Base pairing between the primers reduces their availability
  4. Excess template leads to competition for primer