The R and S loci are 20 m.u. apart. If a plant of genotype Rs/rS were allowed test cross ,which of the following progeny having 10% proportional ?

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#Question id: 4019

#Unit 3. Fundamental Processes

Which of the following proteins does not “footprint” the lac operon control region?

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#Question id: 20540

#Unit 12. Applied Biology

Toluene, ethylbenzene and xylene must be kept to ________levels in drinking and recreational waters due to their toxicity

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#Question id: 10735

#Unit 10. Ecological Principles

Which of the following extreme viewpoints of community organization holds that a community comprises a superorganism and is much more than the sum of its individual parts?

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#Question id: 13059

#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.

Efficiency during ligation of blunt ended insert and vector cannot be cannot be enhanced by means of…..

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#Question id: 23786

#Unit 7. System Physiology – Animal

Which cells contain melanopsin?