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: 4917

#Unit 8. Inheritance Biology

Cytoplasmic male sterility in maize is manifestation of interaction between

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#Question id: 15328

#Unit 4. Cell Communication and Cell Signaling

Given some properties of B-cells, except?

a) They are APCs

b) Have surface marker CD19

c) Antibodies at surface of b cell – IgM, IgE

d) They can express only MHC1

e) Part of Innate immunity

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#Question id: 10729

#Unit 10. Ecological Principles

Researcher study the diversity community was shown in table, the relative abundance of each species at different community? 

      

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#Question id: 26436

#Unit 3. Fundamental Processes

Microsatellite instability is caused by the mutation in

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#Question id: 969

#Unit 1. Molecules and their Interaction Relevant to Biology

In mammals, most amino acids undergo deamination in the ________.