A Microbiologist Inoculates Staphylococcus Epidermidis and Escherichia Coli into a Culture

question 71

Multiple Choice

A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium. Following incubation, only the E. coli grows in the culture. What is the most likely explanation?

• A) The microbiologist used too much inoculum.
• B) The culture was contaminated.
• C) The incubation temperature was incorrect.
• D) The culture medium was differential.
• E) The culture medium was selective.

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Definitions:

Urethra

The tube leading from the bladder to the outside of the body, allowing urine to be expelled.

Sertoli Cells

Male reproductive cells that support, nourish, and regulate the sperm-producing cells.

Semen

A fluid containing spermatozoa and secretions from the male reproductive glands, involved in the fertilization process.

Meiosis

A type of cell division in sexually reproducing organisms that results in four daughter cells, each with half the chromosome number of the parent cell.