Some given statements about Auxin signalling pathways are listed;

a) The auxin receptor is composed of two proteins: the SCF complex component TIR1 and the repressor protein AUX/IAA

b) The binding of auxin to its receptor complex initiates ubiquitin-dependent degradation of the AUX/ IAA repressor protein by the 26S proteasome 

c) TIR1 recruits AUX/ IAA proteins to the SCFTIR1  complex in an auxin-independent manner

d) AUX/IAA proteins are ubiquitinated by the E3 ligase activity of the SCFTIR1 complex, which marks the protein for destruction by the 26S proteasome

Which of the following is correct explanation of Auxin signalling pathways?

#Question id: 5127

#Unit 5. Developmental Biology

The following are certain statements regarding stem cells. Which one is correct?

#Question id: 5128

#Unit 5. Developmental Biology

During lens formation in the Xenopus, the following statements have been proposed. Which statement is incorrect?

#Question id: 5129

#Unit 5. Developmental Biology

once the lens has formed, it induces other tissues. One of these responding tissues is the optic vesicle itself; thus, the inducer becomes the induced. Under the influence of factors secreted by the lens, the optic vesicle becomes the optic cup, and the wall of the optic cup differentiates into two layers: the pigmented retina and the neural retina. such interactions are called as-

#Question id: 5130

#Unit 5. Developmental Biology

Regulation by gradients of paracrine factor concentration was elegantly demonstrated by the specification of different mesodermal cell types in the frog Xenopus laevis by activin, a paracrine factor of the TGF-beta family. Which of the following observations are correct from this graph?

#Question id: 5131

#Unit 5. Developmental Biology

Differentiated cells express the genes and proteins characteristic of their final identity in the adult, and that identity can be altered only under special circumstances. How does the concept of differentiation, as described here, differ from the concept of determination?

#Question id: 5132

#Unit 5. Developmental Biology

Upon secretion of wnt, When Wnt attaches to the Frizzled receptor on a responding cell, the cell secretes Notum, a hydrolase that associates with glypican and then cleaves off Wnt’s attached lipids in a process of deacylation or delipidation. This process: