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TLS Online TPP Program

#Question id: 13161

Which of the following mechanism depends on the activation of heterotrimeric G proteins?

#Unit 4. Cell Communication and Cell Signaling
  1. During actin filament formation, the inactive formin is activated when its Rho-binding domain (RBD) binds to membrane-bound active Rho-GTP, resulting in exposure of the formin’s FH2 domain, which can then nucleate the assembly of a new actin filament.
  2. Rod cells sense light with the aid of a light-sensitive rhodopsin which is coupled to transducin. On absorption of a photon, the retinal moiety of rhodopsin is immediately converted from the cis isomeric form to the all-trans isomeric form, causing a conformational change that allows rhodopsin to bind the α subunit of transducin.
  3. Ras proteins are “switch” proteins and not directly linked to cell-surface receptors. Ras activation is accelerated by a guanine nucleotide exchange factor (GEF), which binds to the Ras∙GDP complex, causing dissociation of the bound GDP.
  4. During the regulation of microfilament organization, Cdc42 act as molecular switches, inactive in the GDP-bound state and active in the GTP-bound state.
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TLS Online TPP Program

#Question id: 28346

#Unit 5. Developmental Biology

Before the fertilization, maternal effect gene such as gurken which binds to torpedo receptor in the terminal follicle cell which activate protein kinase A which recruits a protein that are responsible for the organization of microtubules in oocyte. the protein is____
TLS Online TPP Program

#Question id: 28347

#Unit 5. Developmental Biology

Par-1 protein is responsible for___
TLS Online TPP Program

#Question id: 28348

#Unit 5. Developmental Biology

After the organization of microtubules, Bicoid mRNA is transferred into the oocytes, which of the following statement is correct about the Bicoid mRNA
TLS Online TPP Program

#Question id: 28349

#Unit 5. Developmental Biology

After the organization of microtubules, the two mRNA bicoid and oskar complexed with microtubules motor protein in oocyte, which localizes these mRNA, select the correct prediction about oskar mRNA?
TLS Online TPP Program

#Question id: 28350

#Unit 5. Developmental Biology

Oskar mRNA becomes complexed to kinesin I, plus-directed motor protein that moves to the growing end of the microtubules at the posterior region, where it translate and allow to the localization of another mRNA such as____
TLS Online TPP Program

#Question id: 28351

#Unit 5. Developmental Biology

Oskar mRNA becomes complexed with plus-directed motor protein in the oocyte, it moves to the growing end of the microtubules at the posterior region, where the translation occur but inhibition of Oskar translation is mediated by____