Question

1. You tested small discs that had chemicals in them against bacteria. We call these chemicals ____________________________.

Answer 1

Solution

Antibiotics

You tested small discs that had chemicals in them against bacteria. We call these chemicals Antibiotics

Additional information

• Antibiotics kill or inhibit growth of bacteria
• When antibiotic containing discs are used against bacteria, it will produce a zone of inhibition around the disc
• Zone of inhibition occurs antibiotics diffuse from the disc and inhibit the growth of bacteria around it
• The word meaning of antbiotic is  "opposing life" (Greek )
• In 1928, Alexander Fleming discovered the first antibiotic, Penicillin
• Penicillin was discovered from a mold known as Penicillium notatum.
• Mechanis of action of antibiotics may vary, Some inhibith the cell wall synthesis, some disrupt the cell membrane formation, some inhibit DNA replication or transcription or some other protein synthesis