chapter 12

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Microbiology
Chapter 12
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1

Which of the following statements regarding fungi is FALSE?

Most fungi are pathogenic for humans.

2

Which of the following statements about helminths is FALSE?

All are parasites.

3

Which of the following statements about the oomycote algae is FALSE

They have chlorophyll.

4

Seventeen patients in ten hospitals had cutaneous infections caused by Rhizopus. In all seventeen patients, Elastoplast bandages were placed over sterile gauze pads to cover wounds. Fourteen of the patients had surgical wounds, two had venous line insertion sites, and one had a bite wound. Lesions present when the bandages were removed ranged from vesiculopustular eruptions to ulcerations and skin necrosis requiring debridement. Fungi are more likely than bacteria to contaminate bandages because they

can tolerate low-moisture conditions

5

Which of the following statements regarding lichens is FALSE?

Lichens are a mutualistic relationship between a fungus and a protozoan

6

Which of the following pairs is mismatched?

anamorphs lack spores

7

In Table 12.1, which is a thick-walled spore formed as a segment within a hypha?

5

8

1-Arthroconidium 5-Chlamydoconidium

2-Ascospore 6-Conidiospore

3-Basidiospore 7-Sporangiospore

4-Blastoconidium 8-Zygospore

In Table 12.1, which of these spores are characteristic of Penicillium?

2 and 6

9

In Table 12.1, which of these spores are characteristic of Rhizopus?

7 and 8

10

In Table 12.1, which of these spores are asexual spores?

1 4 5 6 7

11

Which of the following pairs is mismatched?

coenocytic hyphae hyphae with cross-walls

12

Which of the following statements regarding protozoa is FALSE?

Nearly all protozoa cause disease.

13

In mid-December, a woman with insulin-dependent diabetes who had been on prednisone fell and received an abrasion on the dorsal side of her right hand. She was placed on penicillin. By the end of January, the ulcer had not healed, and she was referred to a plastic surgeon. On January 30, a swab of the wound was cultured at 35C on blood agar. On the same day, a smear was made for Gram staining. The Gram stain showed large (10 m) cells. Brownish, waxy colonies grew on the blood agar. Slide cultures set up on February 1 and incubated at 25C showed septate hyphae and single conidia. The most likely cause of the infection is a

dimorphic fungus.

14

Which of the following tends to be more complex in a parasitic helminth than in free-living helminths

reproductive system

15

Which of the following statements is FALSE

Fungal spores are highly resistant to heat and chemical agents.

16

Which of the following pairs are mismatched

1. arthroconidium formed by fragmentation

2. sporangiospore formed within hyphae

3. conidiospore formed in a chain

4. blastoconidium formed from a bud

5. chlamydoconidium formed in a sac

2 and 5

17

Which of the following pairs is mismatched?

green algae prokaryotic

18

Helminthic diseases are usually transmitted to humans by

gastrointestinal route.

19

All of the following are characteristic of the Platyhelminthes EXCEPT that they

have highly developed digestive and nervous systems

20

In the malaria parasite life cycle, humans are the ________ host, while mosquitoes are the ________ host as well as the vector.

intermediate; definitive

21

Three weeks after a river rafting trip, three family members experienced symptoms of coughing, fever, and chest pain. During the rafting trip, the family had consumed crayfish that they caught along the river banks. An examination of the patients sputum revealed helminth eggs, and serum samples were positive for antibodies to Paragonimus. All of the family members recovered following treatment with praziquantel. In the Paragonimuslife cycle,

humans are the definitive host and crayfish are the intermediate host.

22

The encysted larva of the beef tapeworm is called a

cysticercus.

23

Which of the following arthropods does NOT transmit diseases by sucking blood from a human host

houseflies

24

Which of the following statements about algae is FALSE?

All are unicellular.

25

Below are paired items referring to the heartworm Dirofilaria immitis. Which of the pairs is mismatched

mosquito definitive host

26

All of the following are characteristic of algae EXCEPT which ONE of the following

They are currently classified as plants.

27

A definitive host harbors which stage of a parasite

adult

28

What do tapeworms eat

intestinal contents

29

Giardia and Trichomonas are unusual eukaryotes because they

lack mitochondria.

30

The life cycle of the fish tapeworm is similar to that of the beef tapeworm. Which of the following is the most effective preventive measure?

cooking fish before eating

31

Which of the following is the most effective control for malaria?

eliminate Anopheles mosquitoes

32

In the microscope, you observe multinucleated amoeboid cells with sporangia that form spores. This is a(n)

plasmodial slime mold.

33

You observe a mass of amoeba-like cells that swarm together, form a stalk, and produce spores. This is a(n)

cellular slime mold.

34

Which of the following pairs is mismatched?

cestodes all are free-living

35

Which of the following is a nucleated, unicellular organism that, if you changed the incubation temperature, would form filaments with conidiospores?

ascomycete

36

Which of the following organisms is photoautotrophic protozoan?

Euglena

37

Which of the following pairs is mismatched

mosquito Pneumocystis

38

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

green algae

39

The cells of plasmodial slime molds can grow to several centimeters in diameter because

they distribute nutrients by cytoplasmic streaming.

40

Assume you have isolated a multicellular heterotrophic organism that produces coenocytic hyphae, motile zoospores, and cellulose cell walls. It is most likely a(n)

oomycote alga.

41

If a larva of Echinococcus granulosus is found in humans, humans are the

intermediate host

42

Ringworm is caused by a(n)

fungus.

43

Yeast infections are caused by

Candida albicans.

44

All of the following are characteristic of lichens EXCEPT

they are a symbiotic relationship between a fungus and a protozoan

45

You see acid-fast oocysts in a fecal sample from a patient who has diarrhea. What is the MOST likely cause?

Cryptosporidium