Ch. 12

Which of the following pairs is mismatched? mosquito - encephalitis tick - Lyme disease mosquito - malaria tick - Rocky Mountain spotted fever mosquito - Pneumocystis

mosquito - Pneumocystis

Below are paired items referring to the heartworm Dirofilaria immitis. Which of the pairs is mismatched? mosquito--vector mosquito--definitive host dog--sexual reproduction dog--definitive host None of the pairs is mismatched

mosquito--definitive host

Assume you have isolated a multicellular heterotrophic organism that produces coenocytic hyphae, motile zoospores, and cellulose cell walls. It is most likely a(n) green alga tapeworm oomycote alga zygomycete fungus ascomycete fungus

oomycote alga

In the microscope, you observe multinucleated amoeboid cells with sporangia that form spores. This is a(n) cellular slime mold plasmodial slime mold Euglenozoa ascomycete tapeworm

plasmodial slime mold

You observe a mass of amboeba-like cells that swarm together, form a stalk, and produce spores. This is a(n) ascomycete tapeworm plasmodial slime mold cellular slime mold Euglenozoa

plasmodial slime mold

Which of the following tends to be more complex in a parasitic helminth than in free-living helminths? digestive system nervous system reproductive system digestive and nervous systems digestive, reproductive, and nervous systems

reproductive system

All of the following are characteristic of lichens EXCEPT they are used as indicators of air pollution. they serve as primary producers in rocky ecosystems. they are arranged in foliose, fruticose, or crustose morphologies. they are a major food source for tundra herbivores. they are a symbiotic relationship of a fungus and a protozoan.

they are a symbiotic relationship of a fungus and a protozoan.

The cells of plasmodial slime molds can grow to several centimeters in diameter because they distribute nutrients by cytoplasmic streaming the large surface can absorb nutrients they have organelles they form spores they have a mouth to ingest nutrients

they distribute nutrients by cytoplasmic streaming

Which of the following groups of algae does NOT produce compounds that are toxic to humans? red algae dinoflagellates green algae diatoms None of the answers is correct; all of these groups algae produce compounds toxic to humans

green algae

Ringworm is caused by a nematode protozoan trematode fungus cestode

fungus

In the table, which of these spores are asexual spores?

1 4 5 6 7

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

In the table, which of these spores are characteristic of Rhizopus?

7 and 8

Which of the following statements about helminths is FALSE? They are multicellular animals They have eukaryotic cells They are heterotrophic All are parasites Some have male and female reproductive organs in one animal

All are parasites

Which of the following statements about algae is FALSE? They use CO2 as their carbon source. They produce oxygen from hydrolysis of water. Some are capable of sexual reproduction. They use light as their energy source. All are unicellular.

All are unicellular

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

Cryptosporidium

Which of the following organisms is photoautotrophic protozoan? cellular slime mold Phytophthora oomycote Euglena plasmodial slime mold

Euglena

Which of the following statements regarding lichens is FALSE? Lichens are very tolerant to pollution The fungal partner provides a means of attachment and protects the algal partner from desiccation Lichens represent a mutualistic relationship between a fungus and an alga The algal partner produces carbohydrates that are absorbed by the fungal partner lichens are often the first life form to colonize rock or soil

Lichens are very tolerant to pollution

Which of the following statements regarding fungi is FALSE? Fungi tolerate low moisture conditions Fungi reproduce by forming asexual or sexual spores Most fungi are eukaryotic heterotrophs Most fungi grow well in acidic culture condition Most fungi are pathogenic for humans.

Most fungi are pathogenic for humans

Which of the following statements regarding protozoa is FALSE? Protozoa are unicellular eukaryotes. Some protozoan pathogens are transmitted by arthropod vectors. Most protozoa reproduce asexually. Nearly all protozoa cause disease. Protozoa are common in water and soil.

Nearly all protozoa cause disease

Which of the following statements about the oomycote algae is FALSE? They cause plant diseases They form hyphae They reproduce sexually They have chlorophyll They produce zoospores in a sporangium

They have chlorophyll

A definitive host harbors which stage of a parasite? miracidium cyst larva adult All of the answers are correct

adult

Which of the following pairs is mismatched? Zygomycota sporangiospores Ascomycota conidiospores Basidiomycota basidiospores anamorphs lack spores microsporidia lack mitochondria

anamorphs lack spores

Which of the following is a nucleated, unicellular organism that, if you changed the incubation temperature, would form filaments with conidiospores? euglenozoa tapeworm cellular slime mold plasmodial slime mold ascomycete

ascomycete

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 are aerobic can tolerate low moisture conditions prefer a neutral environment (pH 7) have a fermentative metabolism cannot tolerate high osmotic pressure

can tolerate low-moisture conditions

Which of the following pairs is mismatched? nematodes many are free living nematodes completes digestive tract cestodes segmented body of proglottids cestodes all are free living trematodes flukes

cestodes all are free living

Which of the following pairs is mismatched? coenocytic hyphae hyphae with cross-walls teleomorph produces both sexual and asexual spores dimorphic fungus grows as a yeast or a mold dermatomycosis fungal infection of the skin systemic mycosis fungal infection of body organs

coenocytic hyphae hyphae with cross-walls

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? not swimming in fish infested waters refrigerating stored fish wearing gloves while handling fish salting fish before eating cooking fish before eating

cooking fish before eating

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 35°C on blood agar. On the same day, a smear was made for Gram staining. The Gram stain showed large (10 µm) cells. Brownish, waxy colonies grew on the blood agar. Slide cultures set up on February 1 and incubated at 25°C showed septate hyphae and single conidia. The most likely cause of the infection is a dimorphic fungus yeast protozoan parasitic alga gram negative bacterium

dimorphic fungus

Which of the following is the most effective control for malaria? eliminate the intermediate host eliminate Anopheles treating patients vaccination None of these is an effective control

eliminate Anopheles

All of the following are characteristic of the Platyhelminthes EXCEPT that they are dorsoventrally flattened. have highly developed digestive and nervous systems. can be divided into flukes and tapeworms. are hermaphroditic. are multicellular animals.

have highly developed digestive and nervous systems.

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 Paragonimus life cycle, the source of the infection was the river water. the crayfish are the definitive host and humans are the intermediate host. both humans and crayfish are definitive hosts .both humans and crayfish are intermediate hosts. humans are the definitive host and crayfish are the intermediate host.

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

In the malaria parasite life cycle humans are the intermediate host. mosquitoes are the definitive host. mosquitoes are the vector. humans are the intermediate host and mosquitos are the definitive host. humans are the intermediate host and mosquitoes are both the definitive host and the vector.

humans are the intermediate host and mosquitoes are both the definitive host and the vector.

If a larva of Echinococcus granulosus is found in humans, humans are the definitive host infected host intermediate host reservoir None of the answers is correct

intermediate host