Statement: In the case of group II introns, the chemistry of splicing and the RNA intermediates produced are the same as those for nuclear pre-mRNA.

 Explanations: I. The intron uses an A residue within the branch site to attack the phosphodiester bond at the boundary between its 5’ end and the end of the 5’ exon-that is, at the 5’ splice site. This reaction produces the branched lariat.

II. A second reaction in which the newly freed 3’ -OH of the exon attacks the 3’splice site, releasing the intron as a lariat and fusing the 3’ and 5’ exons.

TLS Online TPP Program

#Question id: 28234

#Unit 5. Developmental Biology

which statement is correct the Principles of stem cell regulation?

TLS Online TPP Program

#Question id: 28235

#Unit 5. Developmental Biology

 Principles of stem cell regulation including extracellular mechanism which define the physical and chemical regulation, which of the following statements best describe the main differences between these two mechanism?

a) physical mechanism takes the form of secreted proteins from surrounding cells that influence stem cell & progenitor differentiation through endocrine

b) Chemical mechanisms including Structural & adhesion factors within the extracellular matrix 

c) physical mechanisms including Structural & adhesion factors within the extracellular matrix 

d) chemical regulation of stem cells takes the form of secreted proteins from surrounding cells that influence stem cell & progenitor differentiation through endocrine

TLS Online TPP Program

#Question id: 28236

#Unit 5. Developmental Biology

 One of the mechanism of stem cell regulation is Extracellular mechanisms which involve physical as well as chemical regulation. which of the following prediction is incorrect about the Physical mechanisms ?

TLS Online TPP Program

#Question id: 28237

#Unit 5. Developmental Biology

One of the regulation of extracellular mechanism is chemical regulation of stem cells takes the form of secreted proteins from surrounding cells that influence stem cell through signals, these Chemical signals maintain the stem cell in which state?

TLS Online TPP Program

#Question id: 28238

#Unit 5. Developmental Biology

 At what state stem cell exist, when stem cells become positioned farther from the niche? 

TLS Online TPP Program

#Question id: 28239

#Unit 5. Developmental Biology

 In principles of stem cell regulation involve Extracellular mechanisms leading to intracellular changes, for these changes various intracellular regulatory mechanisms include, except?