Binding of platelet activating factor (PAF) to its receptor on the neutrophil:

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#Question id: 19812

#Unit 12. Applied Biology

Defective viral genomes are introduced into plants to protect plants from virus. What do these genes do for protection?

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#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?

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#Question id: 18885

#Unit 13. Methods in Biology

The total magnification of a microscope is calculated by:

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#Question id: 8860

#Unit 9. Diversity of Life Forms

A radially symmetrical animal that has two embryonic tissue layers probably belongs to which phylum?

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#Question id: 15528

#Unit 4. Cell Communication and Cell Signaling

The B7 family of protein interact  with distinct receptor present on the T-cells,