The choices are:
<span>A.  Matrix protein
B.  Hemagglutinin
C.  An ion channel
D.  Neuraminidase
</span>
The right answer is B. Hemaglutinin
Explanation:
Haemagglutinins are triangular rods. They allow the attachment of Influenzaviruses on the target cells of the respiratory tree. In the presence of red blood cells, a haemagglutination (liquid medium) is obtained.
<u>About the other components of Influenza virus:</u>Neuraminidase is a mushroom-shaped spike composed of a tetramer consisting of 4 subunits of a single glycoprotein. At 37 ° C, the neuraminidase destroys the bonds (virus - cells) and thus allows the release of neoformed virions in the external environment: it is elution.
The membrane protein M and the protein subunits of the nucleocapsid are antigenic and are the basis of the classification of Influenzavirus types A, B and C. They induce the synthesis of non-protective antibodies fixing the complement.
        
             
        
        
        
Answer:
The cell membrane (also called the phospholipid bilayer or the plasma membrane) is one of the most important structures a cell has. If you think of the cell as a really popular nightclub, the membrane is the bouncer. It decides what enters and exits the cell.
 
        
             
        
        
        
I think True, sorry if i'm incorrect :(
        
             
        
        
        
Answer:
1 is A 2 is D 3 is B 4 is C 
Explanation:
have a nice day!!
 
        
                    
             
        
        
        
Answer: chloride ions
Explanation:
This movements of  chloride ions  into the blood plasma to replace the outward diffused bicarbonate ions is  called  chloride shift, It  occurs  to restore the blood ionic balance altered by the bicarbonate ions diffusion out into plasma
The same amounts of Chloride ions replaced the lost amount of  bicarbonate ions