Which, if any, of the following statements is incorrect?

I. In X-chromosome inactivation, the inactivated X chromosome is epigenetically silenced by a transcript, the XIST RNA, that is produced from the active X chromosome.

II. The XIST RNA works by coating most of the X chromosome that is to be inactivated and then recruiting Polycomb proteins to condense the chromosome.

III. The inactivated X chromosome carries the kinds of histone modification that are typical of heterochromatin.

IV. The pattern of X-chromosome inactivation is made randomly but once it has been established the same pattern of X-inactivation is propagated through all mitotic and meiotic cell divisions.

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#Question id: 4313

#Unit 3. Fundamental Processes

Which of the following statements best describes the characteristics of siRNA?

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#Question id: 28825

#Unit 2. Cellular Organization

Which of the following Troponin, is the calcium-binding subunit, controls the position of TM on the surface of an actin filament through the other subunits?

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#Question id: 1180

#Unit 4. Cell Communication and Cell Signaling

In which of the following double-mutant flies will R7 photoreceptors develop normally?

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#Question id: 5183

#General Aptitude

Find the least number which when divided by 5, 7, 11 leaves reminders 1, 2, 4 respectively?

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#Question id: 1264

#Unit 4. Cell Communication and Cell Signaling

 Desmosomes