On the first day of examination of the primary plates of an eye culture from a 10-year-old female, the following results were noted:
BAP: moderate growth of small, alpha-hemolytic colonies showing some depressions in the center of each colony
CHOC: moderate growth of small, colonies showing depressions in the center of each and
surrounded by a green zone of discoloration
MAC: no growth
Results of testing of the alpha hemolytic colony:
Gram stain: gram-positive cocci in pairs and short chains
Catalase: no bubbles
Optochin susceptibility: 16 mm
Susceptibility testing on Mueller-Hinton with sheep blood agar against 1 g oxacillin: 17 mm
Given the testing results above, this organism is possibly a
A) penicillin-sensitive Streptococcus viridans. B) penicillin-resistant Streptococcus viridans.
C) penicillin-resistant Streptococcus pneumoniae. D) penicillin-sensitive Streptococcus pneumoniae.
Question 2
Acyl-cholesterol acyltransferase:
A. Esterifies free cholesterol from the outer layer of the lipoprotein followed by a shift of the esterified cholesterol to the core of the chylomicrons.
B. Hydrolyzes triglycerides on the surface of chylomicrons to glycerol and fatty acids.
C. Converts free cholesterol to esterified cholesterol for storage.
D. Converts cholesterol to esterified cholesterol.
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