To determine if the type of agar affects bacterial growth, a scientist cultures

Question

To determine if the type of agar affects bacterial growth, a scientist cultures E. coli on four different types of agar. Five petri dishes are set up to collect results:

One with nutrient agar and E. coli

One with mannitol-salt agar and E. coli

One with MacConkey agar and E. coli

One with LB agar and E. coli

One with nutrient agar but NO E. coli

All of the petri dishes received the same volume of agar, and were the same shape and size. During the experiment, the temperature at which the petri dishes were stored, and at the air quality remained the same. After one week the amount of bacterial growth was measured.

A. Independent Variable:

B. Dependent Variable:

C. Controlled Variables/Constants:

D. Experimental Controls/Control Groups

Explanation / Answer

A. Independent Variable: Type of agar medium

B. Dependent Variable: amount of bacterial growth

C. Controlled Variables/Constants: All of the petri dishes received the same volume of agar, and were the same shape and size. During the experiment, the temperature at which the petri dishes were stored, and at the air quality remained the same.

D. Experimental Controls/Control Groups: One with nutrient agar but NO E. coli (Contain only growth media, but no bacteria)

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