MCB 2010 – which of these spores are asexual spores

10 Jun MCB 2010 – which of these spores are asexual spores

Question
48) In Table 12.1, which of these spores are asexual spores?

A) 1, 4, 5, 6, 7

B) 2, 3, 6, 8

C) 1, 3, 5, 8

D) 2, 4, 6, 7, 8

E) All of the spores are asexual.

49) Which of the following pairs is mismatched?

A) teleomorph — produces both sexual and asexual spores

B) dermatomycosis — fungal infection of the skin

C) dimorphic fungus — grows as a yeast or a mold

D) systemic mycosis — fungal infection of body organs

E) coenocytic hyphae — hyphae with cross-walls

50) Which of the following statements regarding protozoa is FALSE?

A) Protozoa are unicellular eukaryotes.

B) Nearly all protozoa cause disease.

C) Most protozoa reproduce asexually.

D) Protozoa are common in water and soil.

E) Some protozoan pathogens are transmitted by arthropod vectors.

51) 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 alga.

D) yeast.

E) protozoan.

52) 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) reproductive system

D) digestive and nervous systems

E) digestive, reproductive, and nervous systems

53) Which of the following statements is FALSE?

A) Fungi produce sexual spores.

B) Fungi produce asexual spores.

C) Fungal spores are used in identification of fungi.

D) Fungal spores are highly resistant to heat and chemical agents.

E) Fungal spores are for asexual or sexual reproduction.

54) 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

55) Which of the following pairs is mismatched?

A) dinoflagellates — paralytic shellfish poisoning

B) brown algae — algin

C) red algae — agar

D) diatoms — petroleum

E) green algae — prokaryotic

56) Helminthic diseases are usually transmitted to humans by

A) respiratory route.

B) genitourinary route.

C) gastrointestinal route.

D) vectors.

E) aerosols.

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

A) are hermaphroditic.

B) are dorsoventrally flattened.

C) have highly developed digestive and nervous systems.

D) can be divided into flukes and tapeworms.

E) are multicellular animals.

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

A) definitive; intermediate

B) intermediate; intermediate

C) temporary; final

D) vector; intermediate

E) intermediate; definitive

59) 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,

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

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

C) both humans and crayfish are intermediate hosts.

D) both humans and crayfish are definitive hosts.

E) the source of the infection was the river water.

60) The encysted larva of the beef tapeworm is called a

A) redia.

B) cercaria.

C) cysticercus.

D) metacercaria.

E) proglottid.

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

A) lice

B) fleas

C) houseflies

D) mosquitoes

E) kissing bugs

62) 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.

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

A) dog — definitive host

B) dog — sexual reproduction

C) mosquito — vector

D) mosquito — definitive host

E) None of the pairs is mismatched.

64) All of the following are characteristic of algae EXCEPT which ONE of the following?

A) Most are photoautotrophs.

B) They are currently classified as plants.

C) They may be unicellular or multicellular.

D) Some produce harmful toxins.

E) They mostly live in aquatic habitats.

65) A definitive host harbors which stage of a parasite?

A) miracidium

B) cyst

C) adult

D) larva

E) All of the answers are correct.

66) What do tapeworms eat?

A) intestinal bacteria

B) host tissues

C) red blood cells

D) intestinal contents

E) plant matter

67) Giardia and Trichomonas are unusual eukaryotes because they

A) are motile.

B) lack mitochondria.

C) lack nuclei.

D) do not produce cysts.

E) do produce cysts.

68) 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

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

A) vaccination

B) treating patients

C) eliminate Anophelesmosquitoes

D) eliminate the intermediate host

E) None of these is an effective control.

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

A) ascomycete.

B) cellular slime mold.

C) Euglenozoa.

D) tapeworm.

E) plasmodial slime mold.

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

A) ascomycete.

B) cellular slime mold.

C) Euglenozoa.

D) tapeworm.

E) plasmodial slime mold.

72) Which of the following pairs is mismatched?

A) nematodes — complete digestive tract

B) cestodes — segmented body made of proglottids

C) trematodes — flukes

D) nematodes — many are free-living

E) cestodes — all are free-living

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

A) ascomycete

B) cellular slime mold

C) euglenozoa

D) tapeworm

E) plasmodial slime mold