Nod factors are recognized by the Nod factor receptor (NFR) in legumes, Upon binding to Nod factors, the NFR heterodimer initiates two main separate processes mediated by SYMRK such as;

a) A signaling pathway that facilitates the infection process itself

b) Activation of the symbiosis receptor-like kinase (SYMRK)

c) Activating an extracellular domain that includes a leucine rich repeat (LRR) region and an intracellular protein kinase domain

d) The activation of a set of genes that regulate the formation of root nodules

Which of the following are the two main separate processes of NFR heterodimer?

#Question id: 7174

#Unit 5. Developmental Biology

According to graph, which of the following statement is incorrect regarding to bicoid protein in drosophila?

#Question id: 7175

#Unit 5. Developmental Biology

The primitive streak is derived from epiblast cells and the central cells of Koller’s sickle. As the primitive streak extends rostrally, Henson’s node is formed. Following are few statements regarding this:

A. As endodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the center of the area pellucida to a more posterior position.

B. As endodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the periphery of the area pellucida to a more posterior position.

C. As mesodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the center of the area pellucida to a more posterior position.

D. As mesodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the periphery of the area pellucida to a more anterior position.

Which of the following statements are correct?

#Question id: 7176

#Unit 5. Developmental Biology

The metamorphic changes of frog development are brought about by following events.

(A) the secretion of the hormone thyroxine (T4) into the blood by the thyroid gland

(B) the degradation of T3 in the target tissues

(C) the conversion of (T4) into the more active hormone, triiodothyronine (T3) by the target tissues

Which of the following series is correct?

#Question id: 7177

#Unit 5. Developmental Biology

Following statements are regarding to the early development in nematodes. Which of the following is incorrect?

#Question id: 7178

#Unit 5. Developmental Biology

In sea urchin, the large micromeres are autonomously specified. They inherit maternal determinants that were deposited at the vegetal hemisphere of the egg; these become incorporated into the large micromeres at fourth cleavage. When an isolated animal hemisphere is combined with isolated micromeres, then what will be the result?

#Question id: 7179

#Unit 5. Developmental Biology

Blocking BMP(BMP2, BMP4, BMP7) signaling by infecting progress zone cells with retroviruses carrying dominant negative BMP receptors. Which of the following results are found?