In eukaryotic cells, transcription cannot begin until

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#Question id: 11271

#SCPH28 | Zoology

Autotrophs in the aquatic ecosystem, unlike their counterparts in the terrestrial ecosystem are mostly microscopic and very low in indigestible (to the herbivores) matter. Following some observation are given? 

A) Tropic level transfer efficiency is greater in aquatic ecosystem than terrestrial ecosystem  

B) Tropical forest herbivores have higher consumption efficiencies than grassland herbivores

C) Flow of energy and nutrient is rapidly in aquatic ecosystem than terrestrial

D) Production efficiency of higher tropic level is greater than lower tropic level

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#Question id: 11004

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

Which of the following is most likely to cause the heart to go into spastic contraction?

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#Question id: 12942

#SCPH28 | Zoology

Name a single - stranded uracil containing vector which is grown in a selectable host deficit of the enzymes.

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#Question id: 14850

#SCPH06 I Botany

A bag contains 2 white and 3 black balls. A ball is drawn 5 times, each being replaced before another is drawn. Find the probability that exactly 4 of the balls drawn are white.

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#Question id: 12909

#SCPH28 | Zoology

According to the diagram, arrange the steps in correct order: 

1. DNA is then digested by the Cas9 nuclease at specific points on both DNA strands. 

2. Homologous recombination to repair the break and incorporate the new DNA sequence then follows. 

3.The nuclease Cas9 is targeted to DNA by a guide RNA consisting of a specific 20 nucleotide spacer/targeting sequence (crRNA).

 4. That identifies the DNA to be modified, linked to a trans-activating (tracrRNA) sequence necessary for the recruitment and stability of Cas9 nuclease.