Which of the following best describes the bacterial cell wall?
A) Protects the cell from osmotic lysis
B) Contributes to pathogenicity
C) Site of action of several antibiotics
D) All of the above
Ans: D) All of the above
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If goats are crossed with sheep, embryos will form but cease development and spontaneously abort. This is an example of
A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. spermatic behavior.
Urinalysis can be used to identify all of the following
EXCEPT a. a metabolic problem. b. a bacterial infection. c. kidney disease. d. diabetes insipidus. e. cardiac damage.
The drug used against intestinal anaerobic bacteria, that can also alter normal flora causing antibiotic-associated colitis is
A. bacitracin. B. chloramphenicol. C. clindamycin. D. ciprofloxacin. E. gentamicin.
The complement components react ______.
A. in a cascade B. in parallel C. differently at different temperatures D. simultaneously