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TLS Online TPP Program

#Question id: 796

Which statement best describes the distinction between the purposes of the two RNAi pathways within the eukaryotic cell?

#SCPH05 I Biotechnology

  1. miRNA-mediated gene silencing represents a back-up pathway should siRNA-mediated gene silencing be unsuccessful at silencing the target dsRNA

  2. siRNA and miRNA-mediated gene silencing pathways must both be active to successfully silence the target dsRNA

  3. miRNA and siRNA-mediated gene silencing represent evolutionary-independent pathways which confer identical silencing mechanisms on the target dsRNA

  4. siRNA-mediated gene silencing represents a cell defence mechanism against exogenous dsRNA; miRNA-mediated gene silencing is an integral gene expression regulation process

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TLS Online TPP Program

#Question id: 4942

#SCPH06 I Botany

Which of the following has not yet been synthesized in laboratory experiments studying the origin of life?
TLS Online TPP Program

#Question id: 4731

#SCPH01 Biochemistry

A pure-breeding strain of squash that produced disk-shaped fruits was crossed with a pure breeding strain having long fruits. The F1 had disk fruits, but the F2 showed a new phenotype, sphere, and was composed of the following proportions

Disk  384            

Sphere 96

 Long  32

What is reason for F2 phenotype?
TLS Online TPP Program

#Question id: 824

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

why comparisons of the X-ray structures of hyperthermophilic enzymes with their mesophilic counterparts have failed to reveal any striking differences between them?
TLS Online TPP Program

#Question id: 9269

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

The distribution of electrons in the excited molecule is somewhat different from the distribution in the groundstate molecule, Absorption of blue light excites the chlorophyll to a higher energy state than absorption of red light because
TLS Online TPP Program

#Question id: 1741

#SCPH01 Biochemistry

B-cells as distinct from T-cells: