mastering chapter 12

Which of the following organisms requires an additional nonhuman host to complete its life cycle?

Plasmodium species. The life cycle of Plasmodium species requires two hosts, one of which is a mosquito.

Which of the following groups of algae does NOT produce compounds that are toxic to humans?

green algae

How do pseudohyphae in yeasts differ from vegetative hyphae in filamentous fungi?

Yeasts use pseudohyphae to invade host tissue, whereas filamentous fungi use their vegetative hyphae for obtaining nutrients.

A definitive host harbors which stage of a parasite?

adult

Which of the following statements about algae is false?

are all unicellular

Which of the following infections are also caused by C. albicans?

-fulminating disease -oral thrush

Which of the following could Tori's physician choose as a treatment for her yeast infection?

-a topical over-the-counter ointment, such as clotrimazole or miconazole -a single oral dose of fluconazole

Which of the following statements about helminths is false?

All are parasites.

Which phylum of protozoa contains organisms that are nonmotile obligate intracellular parasites?

Apicomplexa.Apicomplexa contains many species that cause disease, including the Plasmodium species that cause Malaria.

How do blastoconidia and chlamydoconidia produced by yeast differ from bacterial endospores?

Blastoconidia and chlamydoconidia are spore structures produced by budding in yeasts, whereas bacterial endospores are produced by bacteria under extreme conditions.

Based on the lab results, which organism is most likely causing Tori's new symptoms?

Candida albicans Diagnosis of a yeast infection usually involves patient history, observation of yeast cells via microscopy, and growth of a culture on Sabouraud dextrose agar. Differentiation between yeasts and bacteria is reliant on biochemical characteristics. Differentiation between yeasts and molds is reliant on spore type and function.

Which of the following statements best describes why the treatment for Tori's fungal infection may result in side effects to her own cells?

Fungal cells and human cells have a nucleus, multiple organelles, and 80S ribosomes for protein synthesis.

Which of the following statements about fungi is true?

Karyogamy refers to a part of the sexual reproduction cycle in which two haploid nuclei fuse to form a diploid zygote.

Which of the following statements regarding fungi is FALSE?

Most fungi are pathogenic for humans.

Which of the following best explains why Tori developed a new series of symptoms?

The antibiotics that treated Tori's primary respiratory infection also removed some of her normal bacterial flora, resulting in an overgrowth of other organisms.

Which of the following statements regarding protozoa is FALSE?

nearly all protozoa cause disease.