Following statements are regarding to gamete fusion and the prevention of polyspermy in mammals.

A. In mammals, it is not the tip of the sperm head that makes contact with the egg but the side of the sperm head.

B. The junction between the inner acrosomal membrane and the sperm cell membrane is called the acrosomal region, and this is where membrane fusion between sperm and egg begins.

C. Sperm-egg fusion appears to involve several proteins, two of which are Izumo, in the oocyte membrane, and Juno, in the acrosomal membrane.

D. These fusion proteins bind together and appear to recruit other proteins to make an adhesion and fusion complex.

Which of the following statements are correct?

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#Question id: 24484

#Unit 3. Fundamental Processes

Which of the following is not the  target for P-TEFb

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#Question id: 24485

#Unit 3. Fundamental Processes

Ser – 2-P  active RNA Pol II to function most efficiently, dephosphorylating Ser – 2 leads to the re-initiation of  , this dephosphorylation of Ser – 2  done by

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#Question id: 24486

#Unit 3. Fundamental Processes

Splicing is an …………reaction that proceeds through a pentavalent phosphorous intermediate.

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#Question id: 24487

#Unit 3. Fundamental Processes

There are three type of Splicing Machinery match them correctly.

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#Question id: 24488

#Unit 3. Fundamental Processes

Which of the following are grouped as self splicing  

a. Nuclear 

b. group I 

c. group II

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#Question id: 24489

#Unit 3. Fundamental Processes

Two transesterification reactions takes place for 2 exon -1 intron configuration. Choose the correct  statement 

a. First transesterification is always caused by exon 1 -3’OH

b. second transesterification is catalysed variably either by external G or branch point while .

c. First transesterification is catalysed variably either by external G or branch point while 

d. second transesterification is always caused by exon 1 -3’OH.