Which of the following is not true of histone tails? Group of answer choices They have enzymatic properties that can covalently modify DNA. They are the target of numerous chemical modifications. They experience changes in net charge, shape and other properties of histones in response to modifications. They are recognized by certain enzymes.

Option A, They have enzymatic properties that can covalently modify DNA.

Explanation:

Histones have very basic nature and possess no enzymatic properties. However, any modification of DNA is carried out after the end of translation process with the help of enzymes on the N –terminal tails through processes such methylation, acetylation, citrullination, phosphorylation.  

There are several Histone-modifying enzymes in the human genome that interact with the non-histone proteins to form functional complexes

Hence, option A is correct

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.