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A microbiologist is working with two separate cultures of the same organism. The bacteria in one culture are resistant to penicillin, whereas the bacteria in the other culture are susceptible to penicillin. The bacteria from both cultures are mixed together, and all the resulting bacteria are resistant to penicillin. What caused this phenomenon?

Which is a biochemical process carried out by both obligate and facultative anaerobes?

If a laboratory uses hazardous chemicals, it must

What stain is used for medically important fungi?

The outer cell wall of the gram-negative bacteria serves three important functions, which includes all the following, except:

In what staining procedure does carbolfuchsin penetrate the bacterial cell wall through heat or detergent treatment?

Name the numerous short (3 to 10 μm) projections that extend from the cell surface and are used for cellular locomotion.

Because infections can be encountered via the air, _____ can cause transmission of some pathogens.

The human body is constantly challenged by pathogens in the environment. It is not infected by every pathogen it encounters because the microbial flora