Sturtevant provided genetic evidence for the existence of four pairs of chromosomes in Drosophila in which of these ways?

TLS Online TPP Program

#Question id: 15527

#Unit 4. Cell Communication and Cell Signaling

CD4 and CD8 T cells leave the thymus and enter the circulation as resting cells in which stage of the cell cycle?

TLS Online TPP Program

#Question id: 29467

#Unit 6. System Physiology – Plant

columella of the root cap cells represent statocytes, or gravity-sensing cells, this can be explained by

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: 27027

#Unit 10. Ecological Principles

Herbivores May Overcome Plant defenses through Mechanical adaptations, example of these adaptations are

TLS Online TPP Program

#Question id: 29503

#Unit 6. System Physiology – Plant

Trichomes of nettles (Urtica dioica) have “cocktail” of secondary metabolites that can cause severe irritation of the skin of animals which are

a. Tartaric acid

b. Serotonin

c. Oxalic acid

d. Formic acid

Which of the following combination secondary metabolites is true