An important characteristic of antibacterial drugs is their selective toxicity. if antibacterial drugs were not selectively toxi
c, then they would kill or interfere with the hosts' cells as well as bacterial cells. examining cellular differences between bacterial (prokaryotic) cells and host (eukaryotic) cells suggests strategies to achieve selective toxicity. we can capitalize on these differences and take advantage of them in the design of antibacterial drugs identify antibacterial strategies that would likely be selectively toxic for bacteria.
Selective toxicity refers to the ability of the drug to targets sites that are relative specific to the microorganism responsible for infection. Sometimes these sites are unique to the microorganism or simply more essential to survival of the microorganism than to the host.
-Antibacterial action generally falls within one of four mechanisms, three of which involve the inhibition or regulation of enzymes involved in cell wall biosynthesis, nucleic acid metabolism and repair, or protein synthesis, respectively. The fourth mechanism involves the disruption of membrane structure.
The correct answer is - comparing the presence of an essential component of the L. pneumophila that is cysteine.
As we know that L-cysteine is essential for the organism L. pneumophila to grow its colonies. The identification is easy in this situation by comparing the two cultured on the traditional BCYE medium and BCYE medicum without L-cysteine.
Colonies that grow on traditional BYCE medium are likely L. pneumophila as they required L-cysteine but not on BYCE medium lacking cysteine.
• Wear safety goggles • Hold the test tube at an angle. Point the test tube away from yourself and all other people. Heat the test tube over the bunsen burner gently from the top of the substance being heated, and always. hope this helps x