Four of the ten enzymes required for the biosynthesis of IMP are listed below. In which order do the reactions these enzymes catalyze occur during the synthesis of IMP?

1. IMP cyclohydrolase

2. GAR synthase

3. glutamine-PRPP amidotransferase

4. AIR carboxylase

TLS Online TPP Program

#Question id: 28781

#Unit 2. Cellular Organization

During actin polymerization, the elongation phase is exponentially increasing as rapidly increases in length of short oligomer by the addition of____

TLS Online TPP Program

#Question id: 28782

#Unit 2. Cellular Organization

The rate of polymerization of actin filaments is given by rate constant K, in which_____

a) the addition of monomers is given by kon (M^–1 sec^–1 ) 

b) the addition of monomers is given by koff  (sec^–1)

c) the loss of monomers is given koff (M^–1 sec^–1 ) 

d) the loss of monomers is given koff (sec^–1)

TLS Online TPP Program

#Question id: 28783

#Unit 2. Cellular Organization

Following statements regarding the actin polymerization;

a) the concentration of G-actin is above the Cc, the filament end will grow

b) the concentration of G-actin is below the Cc, the filament end will grow

c) (+) end of microfilament polymerization is much faster than the (-) end

d) D form that adds to the filament and the T form that leaves

Which of the following statements are correct?

TLS Online TPP Program

#Question id: 28784

#Unit 2. Cellular Organization

Cytochalasin D,  a fungal alkaloid, depolymerizes actin filaments by___

TLS Online TPP Program

#Question id: 28785

#Unit 2. Cellular Organization

A sponges toxin Latrunculin involve__

TLS Online TPP Program

#Question id: 28786

#Unit 2. Cellular Organization

Which of the following toxin enhances the nucleation by binding and stabilizing actin dimers and lowering the Cc?