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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?

#Unit 1. Molecules and their Interaction Relevant to Biology

  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: 24493

#Unit 3. Fundamental Processes

Splice sites are directional in nature. 5’ splice site -the left, or donor, site and the 3’ splice site - right, or acceptor, site. 
1. U2 addition to base pair with the branch site in the presence of ATP
2. U1 and U4 release Formation of the catalytic center in which U6 base pairs with the 5' splice site; U6 also base pairs with U2; U2 remains base paired with the branch site; U5 interacts with both exons through its loop.

So, 1 and 2 are the event of complex formation which are 
TLS Online TPP Program

#Question id: 8933

#Unit 9. Diversity of Life Forms

At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?
TLS Online TPP Program

#Question id: 21384

#Unit 12. Applied Biology

Which of the following vitamins inhibits the callus formation and improve shoot growth?
TLS Online TPP Program

#Question id: 12209

#Unit 7. System Physiology – Animal

At birth, a large, well-nourished baby is found to have a plasma glucose concentration of 17 mg/Dl (normal is 80 to 100 mg/dL) and a plasma insulin concentration twice the normal value. What is the explanation for these findings?
TLS Online TPP Program

#Question id: 33460

#Unit 1. Molecules and their Interaction Relevant to Biology

Assume that a poly(A) tract five base pairs long produces a 20o bend in a DNA strand. What will the total (net) bend produce in a DNA if the center base pairs (the third of five) of two successive (dA)5 tracts are located15 base pairs apart;