Choose the incorrect?

1- COPI vesicles transport proteins from the rough ER to the cis -Golgi; COPII vesicles transport proteins in the reverse s Direction.

2- The KDEL receptor binds more tightly to its ligand ar low pH, and it is thought that the receptor is able to bind KDEL peptides in the cis-Golgi but to release these peptides in the ER because the pH of the Golgi is slightly lower than that of the ER.

3- The KDEL sorting signal is recognized and bound by the KDEL receptor, a transmembrane protein found primarily on small transport vesicles shuttling between the ER and the cis -Golgi and on the cis-Golgi reticulum.

TLS Online TPP Program

#Question id: 28848

#Unit 2. Cellular Organization

A protein is accelerating polymerization of microtubule, by binding with free tubulin subunits, that protein is____

TLS Online TPP Program

#Question id: 28849

#Unit 2. Cellular Organization

Select the correct combination of Kinesin-13?

a) It is ATPases

b) It is end-binding Proteins 

c) It is a member of the kinesin motor protein superfamily

d) It controlling the activities of proteins during the cell cycle

e) It involves to enhancing the frequency of catastrophe activity

TLS Online TPP Program

#Question id: 28850

#Unit 2. Cellular Organization

Kinesin-13 bind and curve the end of the tubulin protofilaments into which conformation?

TLS Online TPP Program

#Question id: 28851

#Unit 2. Cellular Organization

Which of the following protein greatly enhancing the frequency of catastrophes?

TLS Online TPP Program

#Question id: 28852

#Unit 2. Cellular Organization

Which of the following proteins are End-Binding Proteins?

a) XMAP215

b) Op18

c) Kinesin-13

d) stathmin

TLS Online TPP Program

#Question id: 28853

#Unit 2. Cellular Organization

Stathmin enhances that a growing microtubule will switch to the shrinking state in which condition?

a) When it increases the effective concentration of tubulin subunits that are available for polymerization 

b) When it decreases the effective concentration of tubulin subunits that are available for polymerization 

c) When stathmin is in phosphorylated condition

d) When stathmin is in dephosphorylated condition