Spikelet

Examples: wheat, barley, sorghum, oats etc.  Poaceae family

Spikelet

The central axis of the inflorescence is called a rachis

Spikelets have two scaly bracts present at the base called glumes

Number of florets per spikelet vary in different species

TLS Online TPP Program

#Id: 9045

#XL - T Zoology

Switching mechanism of monomeric G proteins 

“Off” state, Removal of the γ phosphate by GTPase-catalyzed hydrolysis causes switch I and switch II to relax into a different conformation

TLS Online TPP Program

#Id: 9046

#XL - T Zoology

Monomeric G proteins, including Ras and various Ras-like proteins, do not directly bind to receptors but act as intermediate proteins in signal transduction pathways.

TLS Online TPP Program

#Id: 9047

#XL - T Zoology

Monomeric G proteins are evolutionarily ancient, as evidenced by their widespread functions examples include: 

eIF2

EF1α and EF2

Ran

Sar

Rab

Rho, Rac, and Cdc42

TLS Online TPP Program

#Id: 9048

#XL - T Zoology

All G protein–coupled receptors contain seven transmembrane α-helical regions (H1–H7). In many GPCRs a short α helix H8 lies parallel to the membrane surface, and a covalently bound palmitic acid group

TLS Online TPP Program

#Id: 9049

#XL - T Zoology

Three principal classes of G PCR that bind their ligand in different ways:

TLS Online TPP Program

#Id: 9050

#XL - T Zoology

Member of family A of GPCRs -β-adrenergic receptors

Member of family B of GPCRs -glucagon receptor 

Member of family C of GPCRs -glutamate receptor