Which of the following initiation factor bring the initiator tRNA?

Which set of the following events occurs during the elongation step of translation?
P. Attachment of mRNA with the smaller subunit of ribosome
Q. Loading of correct aminoacyl-tRNA into the A site.
R. Formation of a peptide bond between the amino acyl-tRNA in the A site and the peptide chain that is attached to the peptidyl-tRNA in the P site.
S. Dissociation of the ribosomal subunits.
T. Translocation of peptidyl-tRNA from the A site to the P site of the ribosome.

A

P, Q and R

B

P, Q and T

C

Q, R and T

D

R, S and T

Which of the following initiation factor when bound to the 30S subunit blocks the A site, so that only the P site is available for the initiator tRNA to bind to?

A

IF-4

B

IF-2

C

IF-3

D

IF-1

The specificity of initiator $$tRNA$$ but absent in elongator $$tRNA\,\left( {tRNA_m^{met}} \right)$$ is conferred by

A

3 G : C pairs present in anti codon stem

B

2 G : C pairs

C

3 C : C pairs

D

All of the above

In a synergistic model of initiation which of the following factor doesn’t directly lead to initiation?

A

eIF4E

B

PAB1

C

eIF4G

D

Protein X

Which of the following is required for determination of initiator efficiency, when the approach involves measurement and conversion of polymer production and initiator decomposition?

A

number of polymer molecules formed

B

number of radicals produced

C

mode of termination

D

all of the mentioned

Consider following data for bulk polymerization, with benzoyl peroxide as initiator. = 6 mol/m3 = 6.56*103 mol/m3 kp2/kt = 1.5*10-6 m3/ mol-s What is the initiator efficiency if initial rate of polymerization is 0.0256 m3/ mol-s benzoyl peroxide decomposes at a rate of 3.2* 10-6 m3/ mol-s-1?

A

= 6 mol/m3 = 6.56*103 mol/m3 kp2/kt = 1.5*10-6 m3/ mol-s What is the initiator efficiency if initial rate of polymerization is 0.0256 m3/ mol-s benzoyl peroxide decomposes at a rate of 3.2* 10-6 m3/ mol-s-1? ] 0.7

B

I

C

I

D

I

Identify the chain initiation step of the polymerisation of ethene in the presence of benzoyl peroxide initiator, from the following?

A

C6H5• + C2H4 = C6H5-CH2-CH2•

B

C6H5-CH2-CH2• + C2H4 = C6H5-CH2-CH2-CH2-CH2•

C

C6H5-CH2-CH2-CH2-CH2• = C6H5-(-CH2-CH2-)n-CH2•

D

C6H5-(-CH2-CH2-)n-CH2• + C6H5-(-CH2-CH2-)n-CH2• = C6H5-(-CH2-CH2-)n-C6H5

What is the initiator efficiency in chain initiation step of free radical polymerization?

A

fraction of unreacted monomers

B

extent of reaction

C

fraction of radicals actually contributing

D

number of initiator molecules

What is the rate chain initiation reaction for initiator efficiency of 0.8, when concentration and decomposition rate of benzoyl peroxide are 4 mol/m3 and 3.24*10-6 m3/ mol-s-1, respectively?

A

2.07*10-5

B

1.57*10-5

C

3.27*10-5

D

1.03*10-5

What has the initiator concentration in the expression for Rp, in bimolecular initiation system, been replaced by?

A

reducing agent concentration

B

oxidising agent concentration

C

product of oxidizing and reducing agent concentration

D

no change

Which of the following initiation factor bring the initiator tRNA?

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