Microbilogy Chapter 12

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Eukaryotes and Microorgansim

All algae are


Select one:


a. Photoautotrophs.

b. Plants.

c. Unicellular.

d. Toxic.

e. None of these.

e. None of these.

Which of the following statements is false?


Select one:


a. A lichen doesn't exist if the fungal and algal partners are separated.

b. Lichens are parasites.

c. In a lichen, the alga produces carbohydrates.

d. In a lichen, the fungus provides the holdfast.

e. Lichens are important soil producers.

b. Lichens are parasites.

Yeast infections are caused by


Select one:


a. Aspergillus.

b. Candida albicans.

c. Histoplasma.

d. Penicillium.

e. Saccharomyces cerevisiae.

b. Candida albicans.

Multinucleated amoebalike cells that produce funguslike spores.


Select one:


a. Ascomycete

b. Cellular slime mold

c. Euglenozoa

d. Tapeworm

e. Plasmodial slime mold

e. Plasmodial slime mold

Which of the following statements about fungi is false?


Select one:


a. All fungi are unicellular.

b. All fungi have eukaryotic cells.

c. Fungi are heterotrophic.

d. Most fungi are aerobic.

e. Few fungi are pathogenic to humans.

a. All fungi are unicellular.

Helminthic diseases are usually transmitted to humans by


Select one:


a. Respiratory route.

b. Genitourinary route.

c. Gastrointestinal route.

d. Vectors.

e. Aerosols.

c. Gastrointestinal route.

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


Select one:


a. Vaccination

b. Treating patients

c. Eliminate Anopheles

d. Eliminate the intermediate host

e. None of these is an effective control.

a. Vaccination

Ringworm is caused by a(n)


Select one:


a. Ascomycete.

b. Cestode.

c. Nematode.

d. Protozoan.

e. Trematode.

a. Ascomycete.

Seventeen patients in ten hospitals had cutaneous infections caused by Rhizopus. In all 17 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


Select one:


a. They are aerobic.

b. They can tolerate low-moisture conditions.

c. They prefer a neutral environment (pH 7).

d. They have a fermentative metabolism.

e. They cannot tolerate high osmotic pressure.

b. They can tolerate low-moisture conditions.

A nucleated, unicellular organism; when you change the incubation temperature, it forms filaments with conidiospores.


Select one:


a. Ascomycete

b. Cellular slime mold

c. Euglenozoa

d. Tapeworm

e. Plasmodial slime mold

a. Ascomycete

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


Select one:


a. Diatoms

b. Dinoflagellates

c. Green algae

d. Red algae

e. All of these produce compounds toxic to humans.

c. Green algae

Which of the following pairs is mismatched?


Select one:


a. Plasmogamy - union of two haploid cells

b. Karyogamy - fusion of nucleus

c. Meiosis - cell division resulting in haploid cells

d. Anamorph - produces asexual spores

e. Deuteromycota - a phylum of fungi

e. Deuteromycota - a phylum of fungi

Which of the following is NOT a characteristic of parasitic platyhelminths?


Select one:


a. They are hermaphroditic.

b. They are dorsoventrally flattened.

c. They have a complete digestive system.

d. They can be divided into flukes and tapeworms.

e. They are multicellular animals.

c. They have a complete digestive system

In a food chain consisting of the following organisms, which acts as a producer?


Select one:


a. Fungi

b. Lichens

c. Protozoa

d. Slime molds

b. Lichens

A definitive host harbors which stage of a parasite?


Select one:


a. Miracidium

b. Cyst

c. Adult

d. Larva

e. All of these

c. Adult

Which of the following statements about helminths is false?


Select one:


a. They are heterotrophic.

b. They are multicellular animals.

c. They have eukaryotic cells.

d. All are parasites.

e. Some have male and female reproductive organs in one animal.

d. All are parasites.

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


Select one:


a. Lice

b. Fleas

c. Houseflies

d. Mosquitoes

e. Kissing bugs

c. Houseflies

Which of the following pairs is mismatched?


Select one:


a. Dinoflagellates - paralytic shellfish poisoning

b. Brown algae - algin

c. Red algae - agar

d. Diatoms - petroleum

e. Green algae - prokaryotic

e. Green algae - prokaryotic

Which of the following statements is false?


Select one:


a. Fungi produce sexual spores.

b. Fungi produce asexual spores.

c. Fungal spores are used in identification of fungi.

d. Fungal spores are resting spores to protect the fungus from adverse environmental conditions.

e. Fungal spores are for reproduction.

d. Fungal spores are resting spores to protect the fungus from adverse environmental conditions.

A multicellular organism; the digestive tract has one opening.


Select one:


a. Ascomycete

b. Cellular slime mold

c. Euglenozoa

d. Tapeworm

e. Plasmodial slime mold

d. Tapeworm

Which of the following statements about fungi is false?


Select one:


a. All fungi are unicellular.

b. All fungi have eukaryotic cells.

c. Fungi are heterotrophic.

d. Most fungi are aerobic.

e. Few fungi are pathogenic to humans.

a. All fungi are unicellular.

Which of the following pairs is mismatched?


Select one:


a. Plasmogamy - union of two haploid cells

b. Karyogamy - fusion of nucleus

c. Meiosis - cell division resulting in haploid cells

d. Anamorph - produces asexual spores

e. Deuteromycota - a phylum of fungi

e. Deuteromycota - a phylum of fungi

Which of the following statements about algae is false?


Select one:


a. They use light as their energy source.

b. They use CO2 as their carbon source.

c. They produce oxygen from hydrolysis of water.

d. All are unicellular.

e. Some are capable of sexual reproduction.

d. All are unicellular.

Which of the following is NOT a characteristic of parasitic platyhelminths?


Select one:


a. They are hermaphroditic.

b. They are dorsoventrally flattened.

c. They have a complete digestive system.

d. They can be divided into flukes and tapeworms.

e. They are multicellular animals.

c. They have a complete digestive system.

An organism that can grow photoautotrophically in the light and chemoheterotrophically in the dark.


Select one:


a. Oomycote

b. Cellular slime mold

c. Euglena

d. Phytophthora

e. Plasmodial slime mold

c. Euglena

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


Select one:


a. Diatoms

b. Dinoflagellates

c. Green algae

d. Red algae

e. All of these produce compounds toxic to humans.

c. Green algae

All algae are


Select one:


a. Photoautotrophs.

b. Plants.

c. Unicellular.

d. Toxic.

e. None of these.

e. None of these

Which of the following statements about helminths is false?


Select one:


a. They are heterotrophic.

b. They are multicellular animals.

c. They have eukaryotic cells.

d. All are parasites.

e. Some have male and female reproductive organs in one animal.

d. All are parasites.

Which of the following statements about the Oomycote algae is false?
A) They form hyphae .
B) They produce zoospores in a sporangium
.C) They cause plant diseases .
D) They have chlorophyll.
E) They reproduce sexually.

D) They have chlorophyll.

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
A) Gram-negative bacterium
B) Dimorphic fungus
C) Parasitic algae
D) Yeast
E) Protozoan.

B) Dimorphic fungus

Which of the following tends to be more complex in a parasitic helminth than in free-living helminths?
A) Digestive system
B) Nervous system
C) Locomotion
D) Reproductive system
E) All of the above are more complex in a parasitic helminth.

D) Reproductive system

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
A) 1 and 2 B) 2 and 3 C) 2 and 5 D) 3 and 4 E) 4 and 5

C) 2 and 5

Cercariae, metacercaria, miracidia, and rediae are stages in the life cycle of
A) Cestodes.
B) Trematodes
C) Nematodes
D) Sporozoans
E) Sarcodina

C) Nematodes

Which stage immediately precedes the adult?
A) Cercaria
B) Metacercaria
C) Miracidium
D) Redia
E) Proglottid

B) Metacercaria

You see acid-fast oocysts in a fecal sample from a patient who has diarrhea. What is the most likely cause?
A) Cryptosporidium
B) Diatoms
C) Entamoeba
D) Giardia
E) Taenia

A) Cryptosporidium

If a larva of Echinococcus granulosus is found in humans, humans are the
A) Definitive host
.B) Infected host
.C) Intermediate host .
D) Reservoir
.E) None of the above

.C) Intermediate 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)
A) Ascomycete fungus .
B) Green alga .
C) Oomycote alga .
D) Tapeworm
.E) Zygomycete fungus.

C) Oomycote alga .

The cells of plasmodial slime molds can grow to several centimeters in diameter because
A)They have organelles
B) They distribute nutrients by cytoplasmic streaming
C) The large surface can absorb nutrients.
D) They form spores
E) None of the above.

B) They distribute nutrients by cytoplasmic streaming

An organism that can grow photoautotrophically in the light and chemoheterotrophically in the dark
.A) Oomycote
B) Cellular slime mold
C) Euglena
D) Phytophthora
E) Plasmodial slime mold

C) Euglena

Which of the following pairs is mismatched?
A) Tick - Rocky Mountain spotted fever
B) Tick - Lyme disease
C) Mosquito - malaria
D) Mosquito - Pneumocystis
E) Mosquito - encephalitis

D) Mosquito - Pneumocystis

Amoebalike vegetative structures that produce sporangia
.A) Ascomycete
B) Cellular slime mold
C) Euglenozoa
D) Tapeworm
E) Plasmodial slime mold

B) Cellular slime mold

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?
A) Salting fish before eating
B) Refrigerating stored fish
C) Cooking fish before eating
D) Wearing gloves while handling fish
E) Not swimming in fish-infested waters

C) Cooking fish before eating

The microspora and archaezoa are unusual eukaryotes because they
A) Are motile
. B) Lack mitochondria
.C) Lack nuclei
.D) Don't produce cysts
.E) Do produce cysts.

. B) Lack mitochondria

Which of the following statements about algae is false?
A) They use light as their energy source
B) They use CO2 as their carbon source .
C) They produce oxygen from hydrolysis of water .
D) All are unicellular .
E) Some are capable of sexual reproduction

E) Some are capable of sexual reproduction

The encysted larva of the beef tapeworm is called a
A) Redia
B) Cercaria
.C) Cysticercus.
D) Metacercaria .
E) Proglottid

.C) Cysticercus.

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