<span>The cell membrane acts as the gatekeeper of the cell, determining what goes in and out.</span>
        
             
        
        
        
It's found in the thylakoid membrane.
 
        
             
        
        
        
What are your options because i have a lot that apply
        
             
        
        
        
We have that for the Question "since ph can affect the activity of the <u>antibiotics</u> why would the Kirby bauer test require that the agar have a ph of 7.4" it can be said that
- Why the Kirby <u>bauer </u>test require that the agar have a ph of 7.4 is because while <em>agents </em>may be in excessive activity, given a scenario that the <em>pH </em>is to exceed 7.4 the results might inverse.
From the question we are told 
since ph can <em>affect </em>the activity of the antibiotics why would the Kirby <u>bauer </u>test require that the agar have a ph of 7.4
Generally 
Agar has a ph value that should exist between 7.2 and 7.4 within a room temperature,given it  solidifies and this should be when initially prepared
Therefore
Why the Kirby <u>bauer </u>test require that the agar have a ph of 7.4 is because 
while <em>agents </em>may be in excessive activity, given a scenario that the <em>pH </em>is to exceed 7.4 the results might inverse.
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The right answer is C) vector
In molecular biology and genetic engineering, vectors are DNA molecules that allow the propagation of sequences of interest. These are chimeric DNA molecules such as plasmids or artificial bacterial chromosomes, containing an origin of replication and one or more genetic markers. The origin of replication allows the maintenance of the vector in the target cell during generations.