MicroBiology-Draft/Sample

particles into their mouthparts, and ciliated cells in the mammalian respiratory tract beat in synchrony to sweep mucus
and debris up and out of the lungs (Figure 3.55).

Figure 3.55 (a) Eukaryotic flagella and cilia are composed of a 9+2 array of microtubules, as seen in this
transmission electron micrograph cross-section. (b) The sliding of these microtubules relative to each other causes a
flagellum to bend. (c) An illustration ofTrichomonas vaginalis, a flagellated protozoan parasite that causes vaginitis.
(d) Many protozoans, like thisParamecium, have numerous cilia that aid in locomotion as well as in feeding. Note the
mouth opening shown here.

Resolution

Since amoxicillin has not resolved Barbara’s case of pneumonia, the PA prescribes another antibiotic,

azithromycin, which targets bacterial ribosomes rather than peptidoglycan. After taking the azithromycin as

Clinical Focus

Chapter 3 | The Cell 131