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TLS Online TPP Program

#Question id: 10146

Light-dependent ion movements modulate enzymes of the Calvin–Benson cycle such as : rubisco, fructose 1,6-bisphosphatase, sedoheptulose 1,7-bisphosphatase, and phosphoribulokinase what will happen Upon illumination;

#Unit 6. System Physiology – Plant
  1. flow of protons from the thylakoid lumen  into the stroma is coupled to release of Mg2+ from the intrathylakoid space to the stroma
  2. light actuated ion fluxes decrease the stromal concentration of protons (the pH increases from 7 to 8) and decrease that of Mg2+ by 2 to 5 mM
  3. The light-mediated decrease of pH and the concentration of Mg2+ activate enzymes of the Calvin–Benson cycle that require Mg2+ for catalysis and are more active at pH 7 than at pH 8
  4. The modifications of ionic composition of the chloroplast stroma are reversed rapidly upon darkening
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TLS Online TPP Program

#Question id: 12775

#Unit 10. Ecological Principles

Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in  density  at  three-  to  five-year  intervals.  Which  of  the  following  represent  (a)  plausible  explanation(s)  of  these cycles?
TLS Online TPP Program

#Question id: 13057

#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.
How primer concentration leads to decrease in PCR efficiency?
TLS Online TPP Program

#Question id: 33374

#Unit 1. Molecules and their Interaction Relevant to Biology

The 310 helix has 
TLS Online TPP Program

#Question id: 12250

#Unit 10. Ecological Principles

Two islands, P and Q, are similar in habitat and other features. They are 100 and 200 km2 in size respectively, but have the same number of species. Which of the following statements can independently explain this observation?
(i)    P is closer to the mainland than Q
(ii)   P is further away from the mainland than Q
(iii)  P has higher speciation rates than Q
(iv) P has lower speciation rates than Q
TLS Online TPP Program

#Question id: 5963

#General Aptitude

A husband forgot his wedding anniversary date. However, he remembers that his marriage was on a Monday of the first half of July, 2004 and he also remembers that the date was an even number. Can you find the date for him?