Eukaryotic cells differ from each other due to their structure and function. Though, two eukaryotic cells could differ in the number and types of organelles they contain.
 
        
                    
             
        
        
        
Answer:
amino acid meet up inside the ribosome. Once translation has begun, it continues down the line as mRNA shifts along through the ribosome. ... During elongation, amino acids are continually added to the line, forming a long chain bound together by peptide bonds
 
        
             
        
        
        
Answer:
both options 4 and 3 is the answer..
 
        
             
        
        
        
Hi! 
An example of a membrane would be Pericardium. This membrane in particular will cover the heart.
What is the Pericardium?
This membrane is a thin, double layered membrane which protects the heart from injuries as well as external blows.In between the membranes, there is a fluid known as pericardial fluid that is present. The function of this is to also protect the heart. 
Hope I could help!
-Peaculiar