In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the

a. amount of morphogen that must bind to receptors to activate an intracellular signaling system. 

b. concentrations of transcription factors required to activate particular genes.

c. concentration at any point effectively provides positional information.

d. amount of morphogen that must bind to receptors to inactivate an extracellular signaling system.

TLS Online TPP Program

#Question id: 15291

#Unit 5. Developmental Biology

Cell to cell communication is important in development of an organism. The ability of cells to respond to a specific inductive signal is called

TLS Online TPP Program

#Question id: 15296

#Unit 5. Developmental Biology

Match the following

Column I	Column II	Column III
A. Cytochalasin D	i. A sponge toxin	a. Enhances nucleation by binding and stabilizing actin dimers and thereby lowering the critical concentration.
B. Latrunculin	ii. A fungal alkaloid	b. Binds and sequesters G-actin, inhibiting it from adding to a filament end.
C. Jasplakinolide	iii. The “angel of death” mushroom	c. Binds at the interface between subunits in F-actin, locking adjacent subunits together and preventing actin filaments from depolymerizing.
D. Phalloidin		d. Depolymerizes actin filaments by binding to the (+) end of F-actin, where it blocksfurther addition of subunits.

Which one of the following is correct combination?

TLS Online TPP Program

#Question id: 15297

#Unit 5. Developmental Biology

 Which of the following statement is correct regarding mammalian cleavage?

TLS Online TPP Program

#Question id: 15298

#Unit 5. Developmental Biology

In mammalian development Prior to blastocyst formation, each embryonic blastomere expresses ________ transcription factors and appears to be capable of becoming either ICM or trophoblast.

TLS Online TPP Program

#Question id: 15299

#Unit 5. Developmental Biology

Name of transcription factor which are responsible for  pluripotency of  stem cells or stimulate the production of OCT4 and NANOG ;

TLS Online TPP Program

#Question id: 15300

#Unit 5. Developmental Biology

In hippo signaling pathway, the activation of the Cdx2 gene in the trophoblast cells appears to be regulated by the Yap protein, which in turn is a cofactor for the transcription factor Tead4. Tead4 is found in the ________blastocyst