Practice Questions

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#Question id: 15484

Microbial process produces l-form of amino acids which makes the process advantageous as compared to synthetic processes. Strains employed for amino acid 1. 1. 1. production are
1. wild-type strains
2. auxotrophic mutants
3. regulatory mutants
4. auxotrophic regulatory mutants
Which of the following combination has correct options

#SCPH28 | Zoology

1,2&3
2,3&4
1,3&4
All

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#Question id: 18610

#SCPH06 I Botany

In an experiment, it was found that the value of Tm for DNA is 45 ̊C, when cell have 22% GC content at the above Tm, then what will be the effect on the value of Tm if GC% increases to 60%

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#Question id: 13066

#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.

Which of the following is a codominant marker?

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#Question id: 8911

#SCPH28 | Zoology

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?

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#Question id: 7294

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

Multiple factors regulate flowering in Arabidopsis. FT mRNA is expressed in companion cells of the leaf vein in response to multiple signals, including day length, light quality, and temperature. FT moves in the phloem from leaves to the apical meristem. FT is unloaded from the phloem in the meristem and interacts with FD.

FT-FD complex activates multiple genes. Which of the following combination is correct?(SS)

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#Question id: 11405

#SCPH06 I Botany

Vulnerability to extinction can be linked to species following characteristics. Which of the following statement are correct?

A. Endemism species are more prone to extinction than fragmented

B. Species that are capable of migrating between fragments of habitat, such as between mainland areas and islands, may be more resistant to extinction

C. Population variability species are less prone to extinct

D. Species with naturally long life spans may be more likely to become extinct