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TLS Online TPP Program

#Question id: 23105

What is 2nd level (making 30 nm) of compaction while making/packaging the nucleosome  

#Unit 2. Cellular Organization
  1. 10-fold
  2. 20-fold
  3. 30-fold
  4. 40-fold
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TLS Online TPP Program

#Question id: 7021

#Unit 5. Developmental Biology

The tracheal (respiratory) system in Drosophila embryos develops from epithelial sacs. The approximately 80 cells in each of these sacs become reorganized into primary, secondary, and tertiary branches without any cell division or cell death. This reorganization is initiated when nearby cells secrete a protein called Branchless, which acts as a:
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?
TLS Online TPP Program

#Question id: 309

#Unit 1. Molecules and their Interaction Relevant to Biology

Predict the correct order among the following________
TLS Online TPP Program

#Question id: 3815

#Unit 3. Fundamental Processes

Use the figure to answer the following question. A space probe returns with a culture of a microorganism found on a distant planet. Analysis shows that it is a carbon-based life-form that has DNA. You grow the cells in 15N medium for several generations and then transfer them to 14N medium. Which pattern in the figure would you expect if the DNA was replicated in a conservative manner?
TLS Online TPP Program

#Question id: 2606

#Unit 2. Cellular Organization

Activity of trp operon is taken as a measurement of ;