Which of the following is a protective layer of cell envelope?

A. Pilus
B. Glycocalyx
C. Ribosome
D. Fimbria
E. Nucleoid


Answer: B. Glycocalyx

Biology & Microbiology

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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 medium was differential. C. The culture was contaminated. D. The incubation temperature was incorrect. E. The culture medium was selective.

Biology & Microbiology

All of the varied sensations we experience are due to which three categories of sensory receptors? 

A. visioceptor, audioceptor, olfactoceptor B. exteroceptor, interoceptor, proprioceptor C. mechanoreceptor, chemoreceptor, electromagnetic receptor D. mechanoreceptor, olfactory receptor, photoreceptor E. mechanoreceptor, chemoreceptor, nociceptor

Biology & Microbiology

_______ is a genus of protist whose secondary host is a mouse and primary host is a cat. This parasitic protist, however, can infect a human fetus by crossing the placental barrier, ultimately causing brain damage.

a. Plasmodium b. Paramecium c. Trypanosoma d. Giardia e. Toxoplasma

Biology & Microbiology

An insect bite can transmit a disease-causing _____ to a human host

a. trypanosome c. ciliate b. apicomplexan d. both trypanosome and apicomplexan

Biology & Microbiology