Answer:
Option-C
Explanation:
The histone modification plays an important role in the epigenetic expression of the DNA that is it acts as a switch for transcription.
The histone proteins contain positive amino acids at the end called arginine and lysine. The positive charge on these amino acids helps bind the histone to negatively charged DNA.
When deacetylase binds the histone, it removes the acetyl group from the lysine which increases the positive charge on the histone thereby binding the "phosphate of DNA" which are negatively charged more tightly. This switch off the transcription.
Thus, Option-C is the correct answer.
Histone tails are normally positively charged due to amine groups present on their lysine and arginine amino acids. These positive charges help the histone tails to interact with and bind to the negatively charged phosphate groups on the DNA backbone. Acetylation, which occurs normally in a cell, neutralizes the positive charges on the histone by changing amines into amides and decreases the ability of the histones to bind to DNA. This decreased binding allows chromatin expansion, permitting genetic transcription to take place. Histone deacetylases remove those acetyl groups, increasing the positive charge of histone tails and encouraging high-affinity binding between the histones and DNA backbone. The increased DNA binding condenses DNA structure, preventing transcription
I would say b or c but c is the best answer in my opinion
Given that the root equi- means "equal" and the Latin word nox means "night", the correct answer as to what the word "equinox" means is C. when the length of day and the length of night are the same.
The answer is c. anything made by humans, as opposed to things made by nature.
Answer:
A) Decreases;increase
Explanation:
When there are high levels of carbon dioxide in the respiratory system, the blood pH level decreases, causing respiratory rate to increase.
This condition is acidosis because not enough CO2 escapes lungs hence CO2 accumulates and decreases pH of blood, making it more acidic. As blood pH drops (becomes more acidic), the parts of the brain that regulate breathing are stimulated to produce faster and deeper breathing to increase the amount of carbon dioxide exhaled to bring our body to the ideal pH.