The smallest mitochondrial genomes in Plasmodium, are only about 6 kb, encoding three proteins and the mitochondrial rRNAs.

Arabidopsis thaliana, has 366 kb of mtDNA and cucurbit plants have about 2 Mb of mtDNA.

TLS Online TPP Program

#Id: 1315

#Unit 4. Cell Communication and Cell Signaling

GTPase superfamily of proteins- eIF2, EF1α, EF2, Ran, Sar, Rab, Rho, Rac, Cdc42

TLS Online TPP Program

#Id: 1316

#Unit 4. Cell Communication and Cell Signaling

G protein coupled receptor contains seven membrane-spanning α helices & heterotrimeric G protein.

TLS Online TPP Program

#Id: 1317

#Unit 4. Cell Communication and Cell Signaling

Muscarinic acetylcholine receptor is coupled to a Gαi protein.

TLS Online TPP Program

#Id: 1318

#Unit 4. Cell Communication and Cell Signaling

Rod cells sense light via light-sensitive GPCR known as Rhodopsin.

TLS Online TPP Program

#Id: 1319

#Unit 4. Cell Communication and Cell Signaling

The heterotrimeric G protein coupled to rhodopsin, called Transducin.

TLS Online TPP Program

#Id: 1320

#Unit 4. Cell Communication and Cell Signaling

On absorption of a photon, the retinal moiety of rhodopsin is immediately converted into 11-cis-retinal to the all-trans retinal.