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TLS Online TPP Program

#Question id: 7291

Five different genes are known to specify floral organ identity in Arabidopsis: APETALA1 (AP1), APETALA2 (AP2), APETALA3 (AP3), PISTILLATA (PI), and AGAMOUS (AG).

Which one of the following statement is incorrect?

#I Life Science/ Life Sciences Group – I-V
  1. plants with the ap2 mutation lack sepals and petals
  2. Plants bearing ap3 or pi mutations produce sepals instead of petals, and carpels instead of stamens.
  3. plants homozygous for the ag mutation lack both stamens and carpels.

  4. Plants bearing ap3 or pi mutations produce petals instead of sepals, and stamens instead of carpels.

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TLS Online TPP Program

#Question id: 675

#SCPH05 I Biotechnology

Which statement is not true about an α-helix?
TLS Online TPP Program

#Question id: 13062

#SCPH05 I Biotechnology

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.
A restriction enzyme cleaves a circular plasmid vector to produce fragments : 1kb, 0.3kb, 2kb, 1kb and 0.3kb. How many bands will be visible on agarose gel?
TLS Online TPP Program

#Question id: 9239

#SCPH28 | Zoology

Why are changes in the global carbon cycle important?
TLS Online TPP Program

#Question id: 7290

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

Following figure regarding to regulatory network in the Arabidopsis shoot meristem stem-cell niche.

A. The transcription factor WUS is synthesized in the cell A and moves via plasmodesmata into cell B, where one of its functions is to induce expression of the CLV3.

B. The transcription factor CLV3 is synthesized in the cell A and moves via plasmodesmata into cell B, where one of its functions is to induce expression of the WUS.

C. Secreted CLV3 protein from cell B binds to the receptor protein kinase on the surface of cell A; there, it activates a signal that represses WUS transcription.

D. Secreted WUS protein from cell B binds to the receptor protein kinase on the surface of cell A; there, it activates a signal that represses CLV3 transcription.

Which of the following combination is correct?
TLS Online TPP Program

#Question id: 10340

#SCPH05 I Biotechnology

There several charecteristics of nitrate reductase, which of the following properties of nitrate reductase is incorrect?