Membrane lipids may

a. spontaneously flip-flop from one membrane leaflet to the other.

b. move laterally within one membrane leaflet.

c. aggregate with membrane proteins to form lipid rafts.

d. be unequally distributed in the two membrane leaflets.

e. be present in varying amounts in different cellular membranes 

TLS Online TPP Program

#Question id: 31055

#Unit 4. Cell Communication and Cell Signaling

MEK is a kinase that phosphorylates its target proteins on:

TLS Online TPP Program

#Question id: 31056

#Unit 4. Cell Communication and Cell Signaling

Raf and analogous MEK phosphorylating kinases in cells are often called: 

TLS Online TPP Program

#Question id: 31057

#Unit 4. Cell Communication and Cell Signaling

Mutations in the Raf gene that lock its kinase domain in a permanently activated conformation, in absence of growth factors, resulting:

TLS Online TPP Program

#Question id: 31058

#Unit 4. Cell Communication and Cell Signaling

MAP kinase also phosphorylates and activates yet another kinase, termed as:

TLS Online TPP Program

#Question id: 31059

#Unit 4. Cell Communication and Cell Signaling

Activated MAP kinase phosphorylates the HER1 EGF receptor on a threonine residue near the juxtamembrane domain. Phosphorylation of this threonine residue: 

TLS Online TPP Program

#Question id: 31060

#Unit 4. Cell Communication and Cell Signaling

Active MAP kinase phosphorylates Raf on multiple sites, results: