BIOL 221
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BIOLOGY 221 MICRO.-PP NOTES & QUIZES chapter. 14, 15 & 20 Questions With Complete Solutions
- Exam (elaborations) • 22 pages • 2023
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Penicillin was considered a "miracle drug" for which of the following reasons? correct answer: It was the first antibiotic 
it does not affect eukaryotic cells 
It has selective toxicity 
It kills bacteria 
 
Most of the available antimicrobial agents are effective (useful) against: correct answer: Bacteria 
 
In what ways are semisynthetic penicillins and natural penicillins alike? correct answer: Both are based on B-lactam 
 
More than half of our antibiotics are: correct answer: Produce...
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BIOL 221 MICRO. EXAM 3 Chapters 14,15 & 20 multiple choice & essay questions with complete solutions
- Exam (elaborations) • 9 pages • 2023
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The most frequently used portal of entry that can cause Hepatitis A is the: correct answer: Mucus membranes of the respiratory tract. 
 
The ability of some microbes such as Trypanosoma or Giardia to alter their surface molecules and evade destruction by the hosts antibodies is called: correct answer: Antigenic variation. 
 
Which of the following statements is TRUE? 
 
-IgA proteases can destroy IgA antibodies. 
-Hemolysins lose red blood cells. 
-leukocidins lose white blood cells. 
-hemolys...
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