Antibiotic Zone of Inhibition A 15 mm B O mm 7 mm 15 mm a. Which antibiotic was most effective against the bacteria being tested? b. Which antibiotic would you recommend for treating a disease caused by this bacterium? c. Was antibiotic A bactericidal or bacteriostatic? How can you tell?

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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**Antibiotic Testing Results**

| Antibiotic | Zone of Inhibition |
|------------|---------------------|
| A          | 15 mm               |
| B          | 0 mm                |
| C          | 7 mm                |
| D          | 15 mm               |

**Questions:**

a. Which antibiotic was most effective against the bacteria being tested?

b. Which antibiotic would you recommend for treating a disease caused by this bacterium?

c. Was antibiotic A bactericidal or bacteriostatic? How can you tell?

**Explanation of the Table:**

The table outlines the effectiveness of four different antibiotics (A, B, C, and D) tested against a particular bacterium. The effectiveness is measured by the "Zone of Inhibition," which indicates the area around the antibiotic where bacteria cannot grow.

- Antibiotics A and D both show a zone of inhibition of 15 mm, indicating they are effective in preventing bacterial growth.
- Antibiotic B has a 0 mm zone of inhibition, meaning it is ineffective against the bacterium.
- Antibiotic C has a 7 mm zone of inhibition, showing moderate effectiveness.

**Discussion:**

- A larger zone of inhibition typically indicates greater effectiveness of the antibiotic, as it signifies a larger area where bacteria are unable to grow.
- Whether an antibiotic is bactericidal (kills bacteria) or bacteriostatic (inhibits bacterial growth) can sometimes be inferred from additional testing or known characteristics of the antibiotic, beyond the zone of inhibition.
Transcribed Image Text:**Antibiotic Testing Results** | Antibiotic | Zone of Inhibition | |------------|---------------------| | A | 15 mm | | B | 0 mm | | C | 7 mm | | D | 15 mm | **Questions:** a. Which antibiotic was most effective against the bacteria being tested? b. Which antibiotic would you recommend for treating a disease caused by this bacterium? c. Was antibiotic A bactericidal or bacteriostatic? How can you tell? **Explanation of the Table:** The table outlines the effectiveness of four different antibiotics (A, B, C, and D) tested against a particular bacterium. The effectiveness is measured by the "Zone of Inhibition," which indicates the area around the antibiotic where bacteria cannot grow. - Antibiotics A and D both show a zone of inhibition of 15 mm, indicating they are effective in preventing bacterial growth. - Antibiotic B has a 0 mm zone of inhibition, meaning it is ineffective against the bacterium. - Antibiotic C has a 7 mm zone of inhibition, showing moderate effectiveness. **Discussion:** - A larger zone of inhibition typically indicates greater effectiveness of the antibiotic, as it signifies a larger area where bacteria are unable to grow. - Whether an antibiotic is bactericidal (kills bacteria) or bacteriostatic (inhibits bacterial growth) can sometimes be inferred from additional testing or known characteristics of the antibiotic, beyond the zone of inhibition.
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