With respect to X-chromosome inactivation, which, if any, of the following statements are not correct? 

I. X-chromosome inactivation in mammals begins in the pre-implantation embryo 

II. In humans all diploid cells that carry two normal X-chromosomes are subject to a random pattern of X-inactivation. 

III. Once a decision has been made to inactivate an X chromosome (either the paternal or maternal X), all descendant cells show the same pattern of X-inactivation. 

IV. The inactivated X chromosome becomes a highly condensed Barr body in which genes are silenced across the length of the chromosome.

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#Question id: 12241

#Unit 10. Ecological Principles

The process of speciation can be prevented by

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#Question id: 28346

#Unit 5. Developmental Biology

Before the fertilization, maternal effect gene such as gurken which binds to torpedo receptor in the terminal follicle cell which activate protein kinase A which recruits a protein that are responsible for the organization of microtubules in oocyte. the protein is____

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#Question id: 19105

#Unit 6. System Physiology – Plant

The type III secretion system (T3SS), to deliver bacterial effector proteins into the plant cell have been identified to be secretion of enzymes which causes dead of the plant, these enzymes are;

a) Phosphatases

b) Proteases 

c)  Lyases

d) Isomerase

e) Ligase

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#Question id: 2030

#Unit 4. Cell Communication and Cell Signaling

Pepsin hydrolysis of IgG molecule will result in

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#Question id: 10172

#Unit 6. System Physiology – Plant

leaves continuously adjust the orientation of their laminae such that they remain perpendicular to the sun’s ray and maximize light absorption by