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TLS Online TPP Program

#Question id: 10779

As plants absorb water from the soil, they deplete the soil of water near the surface of the roots, This depletion due to

#SCPH05 I Biotechnology
  1. increases Hydrostatic pressure (ψp) in the water near the root surface
  2. establishes a pressure gradient with respect to neighboring regions of soil that have higher ψp values
  3. increase Hydrostatic pressure(ψp) in the water near the root surface
  4. Establishes a pressure gradient with respect to neighboring regions of soil that have lower ψp values 
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TLS Online TPP Program

#Question id: 6960

#SCPH01 Biochemistry

At the blastocyst stage during mammalian embryonic development, the specification of trophectoderm requires ________; whereas in inner cell mass _________activation is essential.
TLS Online TPP Program

#Question id: 5539

#I Life Science/ Life Sciences Group – I-V

When does neurulation occur during human pregnancy?
TLS Online TPP Program

#Question id: 13060

#SCPH28 | Zoology

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.
In blue white screening insertional activation of Beta-D-galactosidase will give rise to
TLS Online TPP Program

#Question id: 8913

#I Life Science/ Life Sciences Group – I-V

The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats. Which of the following most directly favors the evolution of the latter, more radical, kind of metamorphosis?
TLS Online TPP Program

#Question id: 3632

#SCPH01 Biochemistry

geneticist is working with a new bacteriophage called phage Y3 that infects E. coli. He has isolated eight mutant phages that fail to produce plaques when grown on E. coli strain K. To determine whether these mutations occur at the same functional gene, he simultaneously infects E. coli K cells with paired combinations of the mutants and looks to see whether plaques are formed. He obtains the following results. (A plussign means that plaques were formed on E. coli K; a minussign means that no plaques were formed on E. coli K.)

How many cistron belong to these mutation?