Which of the following is/are used to identify methicillin-resistant Staphylococcus aureus?
A) selective media
B) differential media
C) PCR
D) selective media, differential media, and PCR
Answer: D
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Winogradsky columns are used primarily for enrichment of
A) aerobic cultures, although occasionally anaerobes do appear. B) anaerobic cultures, although occasionally aerobes do appear. C) aerobes, anaerobes, and phototrophs. D) phototrophs, although occasionally heterotrophs do appear.
Generally speaking, nutritionally variant streptococci require what ingredient not found in most conventional media?
a. Vitamin B6 b. Nalidixic acid and its components c. Nicotinamide adenine dinucleotide (NAD) enrichment d. Blood or blood products
Pepsin, a digestive enzyme that degrades proteins in the stomach, is synthesized as pepsinogen and converted to active
pepsin in the stomach by the removal of several amino acids. The activation of pepsin is an example of ____.
a. transcriptional regulation b. translational regulation c. posttranscriptional regulation d. posttranslational regulation e. RNAi
Which term refers to the selective movement of specific small molecules and ions into excretory system tubules?
a. release b. secretion c. reabsorption d. filtration