Prokaryotic Cells = do not have a nucleus; generally smaller and simpler that Eukaryotic cells. 
-Smaller
-does NOT have a Nucleus
-translates to ‘no Nucleus’ OR  ‘no true Nucleus’
-simpler
-they don't have all of their genetic material bound in a nucleus, which is why they are simpler forms of life. 
-Prokaryotic cells do have genetic information but it is just stored differently
Ex: Bacteria and Single-Celled organisms 
Eukaryotic Cells = Contains a Nucleus and are usually larger and more complex than a Prokaryotic cell
-Bigger
-DOES have a Nucleus
-More Complex
-Specialized to do certain things
Ex: All the Cells in a Human’s body. Skin cells, Red Blood cells
 
        
             
        
        
        
Answer:
a. methylation at lysine 9 or 27 of histone H3.
Explanation:
Methylation causes the switching off of genes using steric hinderance to prevent access to DNA.
 
        
             
        
        
        
A). Calculation: Given mass of Au * 1mol of Au/molar mass of Au= # of moles
;
 57.01 g Au*1 mole of Au/196.97g Au=0.3 moles of Au.  So the answer is 0.3 moles of gold(Au). Good luck on the rest,  and message me on Brainly if you need more help. I'll be happy to.