I think you're talking about histones. Histones are proteins found in eukayotic cell nuclei. Histones are what DNA wrap around so it fits inside the nucleus and helps with the formation of chromosomes.
        
             
        
        
        
<span>Antrophocentric ideas and beliefs involve believing that only human beings and human beings alone are of the utmost importance above all else, that the human self is of the total concern. It is a very "self" oriented set of ideas. Eccocentrists are particularly and primarily focused on the environment, preservation, and "green" movements.</span>
        
             
        
        
        
Answer:
C.  The drum will work on Earth and in outer space. The drum will not work under the water.
 
        
             
        
        
        
Answer: Oligodynamic and unaffected by antimicrobial resistance
Explanation:
Silver is one of the most affected effective antimicrobial which is so effective that the microbes die when being exposed to the silver.
It is used in case of wound dressing, and it is used to coat medical devices . It is used as an external application such as on the skin and while dressing.
The oligodynamic action of the metal is to block the free carbonyl and sufhydryl group present in the organism.
Even in the small concentration it can be used to kill the microbes.
 
        
             
        
        
        
Answer:
a. deterioration of neurons that produce the neurotransmitter acetylcholine.
Explanation: 
Alzheimer's disease -  
It is a disease associated with memory , it is a type of dementia . 
The initial stages of the disease is the remember new things , the day to day task becomes very difficult with time . 
During this disease the neurons get deteriorated day by day , which are responsible to produce the acetylcholine . 
Hence , the correct statement about Alzheimer's disease is ( a ) .