A urine specimen from a maternity patient with the complaint of cystitis was received in the laboratory. The culture of this sample grew a lactose-positive, gram-negative bacillus that was presumptively identified as Escherichia coli. On differential and selective media this organism would demonstrate which reaction?

A. Hektoen Enteric Agar- green/colorless with black centers
B. MacConkey Agar= colorless colonies
C. Xylose-lysine Desoxycholate Agar= yellow colonies
D. Xylose-lysine Desoxycholate Agar = Colorless colonies


Ans: B. MacConkey Agar= colorless colonies

Biology & Microbiology

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Which of the following lipid compositions would yield the greatest membrane fluidity?

A. Phospholipids with long-chain, saturated fatty acids at low temperature B. Phospholipids with long-chain, unsaturated fatty acids, plus cholesterol at normal temperature C. Phospholipids with short-chain, unsaturated fatty acids, plus cholesterol at low temperature D. Phospholipids with short-chain, saturated fatty acids, plus cholesterol at normal temperature

Biology & Microbiology

The drugs of choice for most Enterococcal infections are:

a. vancomycin and a penicillin. b. clindamycin and vancomycin. c. penicillin and an aminoglycoside. d. septra.

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Which of the following plant hormones is associated with the closure of stomata when a plant experiences water stress?

A. cytokinin B. gibberellins C. auxin D. abscisic acid

Biology & Microbiology

Body mass index (BMI) is an indirect measurement of ____.

A. caloric intake B. energy utilization C. basal metabolic weight D. age E. body fat

Biology & Microbiology