#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:
#Question id: 5133
#Unit 5. Developmental Biology
Identify the correct ligands in both receptor serine kinase pathway.
#Question id: 5134
#Unit 5. Developmental Biology
Match the following cleavage patterns with the species in which they occur.
| Species | Cleavage Pattern |
| A. Flatworm | i. Meroblastic discoidal |
| B. Frog | ii. Meroblastic superficial |
| C. Birds | iii. Holoblastic displaced radial |
| D. Insect | iv. Holoblastic spiral |
#Question id: 5135
#Unit 5. Developmental Biology
In xenopus, result of tissue transplantation during early and late gastrulae
(A) Cells of early newt gastrula exhibit conditional development.
(B) Cells of early newt gastrula exhibit autonomous development
(C) Cells of late newt gastrula exhibit conditional development.
(D) Cells of late gastrula exhibit autonomous development.
The correct inferences are: