In Meristematic zone, 

cells divide both in the direction of the root base to form cells that will differentiate into the tissues of the functional root and in the direction of the root apex to form the root cap

TLS Online TPP Program

#Id: 9075

#XL - T Zoology

Active PDE hydrolyzes cAMP, driving cAMP levels back to basal levels.

TLS Online TPP Program

#Id: 9076

#XL - T Zoology

A G protein– coupled receptor kinase phosphorylates serine and threonine residues in the

cytoplasmic segments of activated GPCRs

TLS Online TPP Program

#Id: 9077

#XL - T Zoology

β-Arrestin (Arr) binds to these phosphorylated receptors. Clathrin and AP2, two other proteins bound by β-arrestin, promote endocytosis of the receptor.

TLS Online TPP Program

#Id: 9078

#XL - T Zoology

GRK–β-arrestin pathway, suppress signaling by GPCRs, actually functions as a switch, turning off signaling by G proteins and turning on other signaling pathways.

TLS Online TPP Program

#Id: 9079

#XL - T Zoology

Muscarinic acetylcholine receptors coupled to a Gαi protein & found in cardiac muscles. 

TLS Online TPP Program

#Id: 9080

#XL - T Zoology

Binding of acetylcholine triggers the opening of an associated K+ channel  in the plasma membrane via the Gβγ subunit of a Gi protein