The assay which is used in DNA foot-printing to identify the nitrogenous base sequences

TLS Online TPP Program

#Question id: 20334

#Unit 4. Cell Communication and Cell Signaling

Sulfotransferases are the first enzymes of the core sulfation pathways, they transfer sulfate from PAPS to the hydroxyl or amino group of a wide variety of acceptors, as given below

a. Molecular basis of symbiotic host specificity in Rhizobium meliloti: nodH and nodPQ genes encode the sulfation of lipochito-oligosaccharide signals

b. Sulfation of the choriogonadotropin alpha subunit in human placental explants

c. Tyrosine sulfation of the amino terminus of CCR5 facilitates HIV-1 entry

d. A tyrosine-sulfated peptide based on the N terminus of CCR5 interacts with a CD4-enhanced epitope of the HIV-1 gp120 envelope glycoprotein and inhibits HIV-1 entry.

e. The Xanthomonas oryzae pv. oryzae raxP and raxQ genes encode an ATP sulfurylase and APS kinase that are required for AvrXa21 avirulence.

Which one of the following combination of above statements is correct?

TLS Online TPP Program

#Question id: 20335

#Unit 4. Cell Communication and Cell Signaling

Quorum sensing-mediates the social cooperation and conflict both-

TLS Online TPP Program

#Question id: 7154

#Unit 4. Cell Communication and Cell Signaling

Cancer is believed to often arise from stem cells, rather than fully differentiated cells. Which of the following are consistent with this view?

TLS Online TPP Program

#Question id: 24202

#Unit 4. Cell Communication and Cell Signaling

Homophilic Binding appears:

TLS Online TPP Program

#Question id: 24203

#Unit 4. Cell Communication and Cell Signaling

Heterophilic Binding appears:

TLS Online TPP Program

#Question id: 24204

#Unit 4. Cell Communication and Cell Signaling

What is the difference between trans and cis interactions during cell-cell adhesion respectively?