What is the primary use of penicillin derived from fungi?

Penicillin, which is derived from the Penicillium fungi, is primarily used as an antibiotic to kill or inhibit the growth of bacteria in the body. Its discovery marked a significant advancement in medical treatment, particularly during the early to mid-20th century, as it provided an effective means to combat bacterial infections that were once potentially fatal. Penicillin works by targeting the bacterial cell wall, leading to cell lysis and death, thus effectively treating various infections.

The other options do not accurately reflect the function of penicillin. Promoting cell reproduction and enhancing nutrient absorption are processes not related to the antibiotic properties of penicillin. Similarly, stimulating fungal growth contradicts the fundamental purpose of penicillin, which is to combat harmful bacteria rather than promote any form of fungal activity.