A mass in the right mandibular angle is misdiagnosed as a cervical/pharyngeal cyst. A biopsy of the cyst shows whorls of epithelial reticular cells (Hassall's corpuscles). What is the correct diagnosis of the cyst?
A. Adenocarcinoma
B. Benign hypertrophy of glandular tissues
C. Chondrocytes
D. Ectopic thymus
E. Osteoma of mandible
Ans: D. Ectopic thymus
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Select the formula below that correctly represents the behavior of CO2 in the blood.
A. CO2 + H2O ? H2CO3 + CO B. CO2 + H+ ? HCO3+ ? H2O + H2CO3 C. CO2 + HCO3- ? H+ + H2O + H2CO3 D. CO2 + H2O ? H2CO3 ? HCO3- + H+ E. CO2 + H2CO3 + O2 ? H2O + CO2 + H2CO3
Commercial canning processes
A. are geared to destroy Clostridium botulinum spores. B. kill all endospores. C. are especially needed on low acid foods. D. are 12D processes (designed to kill 1012 endospores). E. are geared to destroy Clostridium botulinum spores, are especially needed on low acid foods, AND are 12D (designed to kill 1012 endospores) processes.
During the treatment of a bacterial infection with antibiotic, the yeast Candida can grow out of control and cause a vaginal or intestinal infection. What is the best explanation for fungal infection?
A. There are fewer bacteria present to compete with the yeast. B. Antibiotics are often contaminated with Candida yeast. C. The antibiotic weakens the immune system. D. Bacteria normally digest yeast cells. E. The antibiotic causes mutations in the yeast that give the yeast resistance.
A client has a serious case of the flu. A random sample of sputum was taken from the patient coughing up blood. The lab tech said they had isolated a bacterium that did not have any peptidoglycan. You hypothesize that the identity of this microbe could possibly be
A. Mycobacterium tuberculosis. B. Borrelia burghdorferi. C. Streptococcus pneumoniae. D. Mycoplasma pneumoniae. E. Staphylococcus aureus.