A peptide has the sequence Glu–His–Trp–Ser–Gly–Leu–Arg–Pro–Gly. What is the net charge of the molecule at pH 3

#Question id: 2883

#Unit 2. Cellular Organization

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.

#Question id: 28794

#Unit 2. Cellular Organization

Which of the following are actin-nucleating proteins or ANPs?

#Question id: 28560

#Unit 5. Developmental Biology

#Question id: 16479

#Unit 12. Applied Biology

#Question id: 1070

#Unit 4. Cell Communication and Cell Signaling

Genetic exchange in segmented viruses that allows a zoonotic virus to infect humans is termed