Following statement regarding to acrosome reaction in sea urchin.

A. Activation of the acrosome reaction serves as a barrier to intraspecies fertilizations.

B. The acrosome reaction is initiated by sulfate-containing polysaccharides in the egg jelly that bind to specific receptors located directly above the acrosomal vesicle on the sperm cell membrane.

C. These polysaccharides are often highly species specific, but egg jelly factors from one species of sea urchin generally activate the acrosome reaction in closely related species.

D. The elevated Ca2+ level in a relatively basic cytoplasm triggers the fusion of the acrosomal membrane with the adjacent sperm cell membrane, releasing enzymes that can lyse a path through the egg jelly to the vitelline envelope.

Which of the following statements are correct?

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

TLS Online TPP Program

#Question id: 28854

#Unit 2. Cellular Organization

which protein promotes breakage by extracting tubulin subunits from the wall of the microtubule (also releases microtubules from MTOCs) ?