Under what circumstances are histones acetylated?
What will be an ideal response?
Ans: Histones are acetylated in the S phase of the cell cycle during DNA replication. (After being incorporated into nucleosomes, they are then deacetylated.) Acetylation of the histones of nucleosomes surrounding a gene's promoter also occurs as the gene is activated.
You might also like to view...
____ relieves the tension on the double helix during DNA replication
Fill in the blank with the appropriate word.
Cloned genes may be mutated outside of a cell by a process called in vitro site-directed mutagenesis
Indicate whether the statement is true or false
During REM sleep, an EEG shows
A) a flat trace with very few waves. B) a pattern that is similar to when a person is in deep sleep. C) an irregular, rapidly changing pattern.
In which of the following do the mucous membranes serve as a portal of entry for disease?
A. a pathogen crosses from the mother to the fetus by way of the placenta. B. A person rubs the eye with contaminated fingers and the pathogen is washed into the nasal cavity by way of tears. C. A person is bitten by a mosquito that carries the malaria parasite. D. Fungi digest the outer layer of the skin. E. A person receives an injection with a contaminated needle.