Question

In a microbiology laboratory, the technician used heat to sterilize the nutrient solution that is used to grow a fungus. When the heating system broke down, he sterilized the solution by passing it (in a sterile environment) through a sterile filter with a pore size of 0.2 micrometers. When the fungus was grown on the filtered nutrient solution it stopped growing and looked unhealthy within a few days. Which statement is the most likely explanation for the observed effects on the fungus?

• A. The nutrient solution contain a virus
• B. Heating makes the glucose in the nutrient solution more digestible
• C. Filtering removed one of the larger nutrient molecules
• D. Filtering changed the pH of the nutrient solution

Answer 1

The correct option is A

The nutrient solution contain a virus

The correct option is D:

Explanation of the correct option:

1. When the heating system was broken down the nutrient solution was contaminated with a virus, although the technician passed the solution (in a sterile environment) through a sterile filter with a pore size of 0.2 micrometres.
2. The virus present in the nutrient solution entered the host and stopped the growth of the fungus. Also used nutrition for reproducing daughter cells.

Final Answer:

The effects are observed on the fungus because the nutrient solution contains a virus.