A microbiologist inoculates Staphylococcus aureus into a culture medium. Followi

Question

A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation? A. The microbiologist used too much inoculum. B. The culture is contaminated. C. The incubation temperature was incorrect. D. The culture medium must be selective. E. The culture medium must be differential. Fluoresence microscopy uses a different wavelength of light to illuminate a specimen versus other types of microscopes. This results in: A. more magnification B. better resolution C. less refraction D. more distortion of the object E. halos around the objects If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X? A. 100X B. 950X C. 85 X D. 850X E. 95X Magnification is achieved in a compound microscope through the initial magnification of specimen by the _____ lens. This image is then projected to the _____ lens that will further magnify the specimen to form a virtual image received by the eye. A, ocular; objective B, scanning; objective C. objective; ocular D, ocular; oil immersion Which type of microscope shows cells against a bright background and also shows intracellular structures of unstained cells based on their varying densities? A. bright-field B. dark-field C. phase contrast D. differential interference E. electron The Gram staining procedure is best described as a/n _____ staining technique. A. selective B. differential C negative D. Special E. simple

Explanation / Answer

Question: 45. A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?

Answer: B. The culture is contaminated

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