Explain why you would use selective media instead of differential media to grow an organism? A) You want to determine biochemical and physiological characteristics. B) You want to determine biochemical characteristics, not cell wall type. C) You want to determine both cell wall type and biochemical characteristics. D) You only want to determine the cell wall type, not any biochemical characteristics.

A) You want to determine biochemical and physiological characteristics.

Explanation: selective media such as MacConkey agar is used to grow, determine and study a particular organism. It allows the growth of the target organism and inhibits the growth of others thereby giving one organism to study at a time instead of growing different organisms and isolating the organism of study. It is specific.

Differential media is used to differentiate, compare and contrast two or more organisms.

D) You only want to determine the cell wall type, not any biochemical

Explanation:

Basically selective media is used in  the culture medium meant for growing only a specific microorganism, while preventing the growth of any other microbes in the medium.It is used  for ensuring the growth and survival of a desired microbe with a desired characteristics, while suppressing the growth of unwanted competitor. it its primary use it to ensure the survival of needed microbes, while neutralizing or killing any unwanted microorganism.

However, in order to distinguished one organism from another in a culture medium , that is to find out if a  micro organism is present or not, biochemical  properties  displayed by the  organism when an indicator is  added  to the medium is usually used .  That is to identify a specific microbes and therefore to differentiate  from others in the  media . It characterise the growth of  a particular microorganism based on the  biochemical properties observed when an indicator is added. it does not kill the other microbes present.

Based on this, option D is correct, because, the objective was not to identify the microorganism based on biochemical properties;or to distinguished one microbes from another;but rather to  select the organism through identification of the cell structure.

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