Question

Alexander Fleming discovered penicillin in 1928, while working with:
A. Streptomyces
B. Bacteria (Staphylococcus)
C. Penicillium notatum
D. P. Chrysogenum

Answer 1

Hint: Penicillin is a group of antibiotics, discovered initially from basic molds known as Penicillium molds; which includes penicillin G (intravenous use), penicillin V (use by mouth), procaine penicillin and benzathine penicillin (intramuscular use).

Complete Answer:
Penicillin was among the main meds to be successful against numerous bacterial diseases brought about by staphylococci and streptococci. In 1928, Alexander Fleming was investigating the properties of Staphylococci. One day, he observed that the culture of Staphylococci was contaminated with fungus and that colonies of the culture surrounding the fungus had been destroyed.

Fleming grew the mold in a pure culture and found that it produced a substance that killed a number of disease-causing bacteria. He identified the mold (fungus) as being from the Penicillium genus and named the substance it released Penicillin. He investigated its positive antibacterial effect on many organisms and noticed that it affected bacteria such as Staphylococci and many other Gram-positive pathogens that cause scarlet fever, pneumonia, meningitis, diphtheria but not typhoid fever caused by Gram-negative bacteria.

Penicillin hinders action of catalysts that are required for the cross connecting of peptidoglycans in bacterial cell walls, which is the last advance in cell wall biosynthesis. It does this by official penicillin restricting proteins with the beta-lactam ring, a structure found on penicillin molecules. This causes the cell wall to debilitate because of less cross links and means water wildly streams into the cell since it can't keep up the right osmotic slope. This results in cell lysis and demise.

The revelation of penicillin changed the world of medication immensely. With its turn of events, diseases that were already serious and regularly lethal, as bacterial endocarditis, bacterial meningitis and pneumococcal pneumonia, could be effortlessly treated.

Thus, the correct answer for this question is B, i.e. Bacteria (Staphylococcus).

Note: Some microbes produce catalysts that separate the beta-lactam ring, called beta-lactamases, which make the microscopic organisms impervious to penicillin. Accordingly, a few penicillins are adjusted or given with different medications for use against anti-toxin safe microscopic organisms or in immunocompromised patients.