Which one of the following statements about the reverse transcriptases of retroviruses and the RNA replicases of other single-stranded RNA viruses, such as R17 and influenza virus, is correct?

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#Question id: 967

#SCPH28 | Zoology

At the subcellular level where does the urea cycle occur?

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#Question id: 5259

#SCPH06 I Botany

Genetic variation in bacterial populations cannot result from

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#Question id: 304

#SCPH28 | Zoology

As compared to covalent compounds electrovalent compounds generally possess ___________

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#Question id: 13058

#SCPH06 I Botany

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 true about real time PCR?

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#Question id: 1042

#SCPH06 I Botany

A student complains that it makes no sense to worry about coliform bacteria in water, since we naturally possess harmless coliforms in our intestines anyway. Why do regulatory agencies worry about coliform bacteria in water supplies, then?