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: 1538

#Unit 4. Cell Communication and Cell Signaling

Many aspects of the biology of stem cells, including maintenance of pluripotency, self-renewal, and differentiation, are controlled by the phenomenon of RNA interference involving a variety of small molecules of RNA.

Match the following miRNA (Column I) with their target gene (Column II).

Column I	Column II
a. Let-7 miRNA	i. Bcl-2
b. miR-16	ii. PTEN phosphatase
c. miR-125a and miR-125b	iii. Myc
d. miR-21	iv. LIN28

TLS Online TPP Program

#Question id: 1539

#Unit 4. Cell Communication and Cell Signaling

Regulatory T cell (TREG) have identified by the presence of

TLS Online TPP Program

#Question id: 1540

#Unit 4. Cell Communication and Cell Signaling

Peptidoglycans  recognize by

TLS Online TPP Program

#Question id: 1541

#Unit 4. Cell Communication and Cell Signaling

Nonphagocytic cell of immune system,

TLS Online TPP Program

#Question id: 1542

#Unit 4. Cell Communication and Cell Signaling

function of  calprotectin?

TLS Online TPP Program

#Question id: 1543

#Unit 4. Cell Communication and Cell Signaling

Effector  cytokines of TH 1 cells?