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TLS Online TPP Program

#Question id: 11580

Melatonin is secreted by the ________.

#Unit 7. System Physiology – Animal
  1. hypothalamus during the day
  2. pineal gland during the night
  3. autonomic nervous system during the winter
  4. posterior pituitary gland during the day
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TLS Online TPP Program

#Question id: 15260

#Unit 2. Cellular Organization

Among the following which kind of media is not used for the detection of E. coli and related bacteria in water supplies and elsewhere.
1.  Endo agar
2. Peptone 
3. Eosin methylene blue agar
4. MacConkey agar
5. Beef extract
Choose the correct combination
TLS Online TPP Program

#Question id: 322

#Unit 1. Molecules and their Interaction Relevant to Biology

A covalent bond is likely to be polar when ________.
TLS Online TPP Program

#Question id: 10217

#Unit 6. System Physiology – Plant

Another effect that appears to be a major factor in the stability of the photosynthetic apparatus, which occurs when excess excitation arriving at the PSII reaction center leads to its inactivation and damage is known as
TLS Online TPP Program

#Question id: 13055

#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.
Which of the following will provide least specific amplification in qPCR?
TLS Online TPP Program

#Question id: 3679

#Unit 3. Fundamental Processes

A mutation in an E. coli cell becomes active half-way through a round of replication. The cell completes the round of replication normally but then cannot start a second round. Which protein could be mutated?