TLS Online TPP Program

#Question id: 5531


The trophoblast forms to the

#Unit 5. Developmental Biology
  1. Chorion

  2. Amnion

  3. Allantois

  4. Yolk sac

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TLS Online TPP Program

#Question id: 537

#Unit 1. Molecules and their Interaction Relevant to Biology

Substrate level phosphorylation

A) describes the conversion of ADP into ATP with the addition of inorganic phosphate every place throughout the cell.

B) describes the formation of ADP by phosphoryl group transfer from 1,3 bisphosphoglycerate.

C) is the formation of ATP by phosphoryl group transfer from a higher energy compound.

TLS Online TPP Program

#Question id: 27081

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is correctly describing the A dihedral angle or torsion angle 

TLS Online TPP Program

#Question id: 26510

#Unit 3. Fundamental Processes

What is the location of intron in tRNA

TLS Online TPP Program

#Question id: 14513

#Unit 13. Methods in Biology

A committee of 5 students is to be chosen from 6 boys and 4 girls. The probability that the committee contains exactly 2 girls is

TLS Online TPP Program

#Question id: 13054

#Unit 13. Methods in Biology

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.
What would the expected effect be on a PCR reaction if the primers used were slightly shorter and more variable than the intended oligonucleotide sequences?