In the 1920s, Frederick Griffith conducted an experiment in which he mixed the dead cells of a bacterial strain that can cause pneumonia with live cells of a bacterial strain that cannot. When he cultured the live cells, some of the daughter colonies proved able to cause pneumonia. Which of the following processes of bacterial DNA transfer does this experiment demonstrate?
A) transduction
B) conjugation
C) transformation
Answer: C
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Acute phase mediators such as C-reactive protein and antiviral proteins such as interferon can be described as similar because both
A. depend on activation of complement. B. prepare host cells for pathogen invasion. C. are acquired immune defenses. D. All of the choices are correct.
While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening. Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:
A. abscisic acid. B. gibberellin. C. indoleacetic acid. D. ethylene. E. cytokinin.
Streptokinase is involved in which of the following?
A) producing antibiotics B) cheese production C) biosensors D) dissolving blood clots E) insecticide
Which of these drugs is useful in treating infections by methicillin-resistant S. aureus and vancomycin-resistant Enterococcus?
A. aminoglycosides B. linezolid C. tetracycline D. cephalosporins E. isoniazid