microbiology chap 12 Flashcards

1. In the late nineteenth century, immigration from Ireland to the United States occurred in high numbers due to an infection of potatoes by

A. bacteria.
B. viruses.
C. fungi.
D. amoeboid protozoa.
E. water molds.

2. Plant pathology grew in importance as a field of study after it was shown that the Irish potato blight was caused by
A. bacteria.
B. viruses.
C. fungi.
D. amoeboid protozoa.
E. water molds.

3. Most fungi are
A. aerobic or facultatively anaerobic.
B. obligate anaerobes.
C. obligate aerobes.
D. microaerophiles.

4. Fungi are particularly adept at infecting
A. protozoans.
B. algae.
C. animals.
D. plants.

5. The return of carbon dioxide to the atmosphere and nitrogen to the soil is due to the action of
A. viruses and plants.
B. bacteria and viruses.
C. fungi and bacteria.
D. fungi and viruses.

6. All fungi have ______ in their cell walls.
A. cellulose
B. pectin
C. peptidoglycan
D. chitin

7. Fungi are classified according to their
A. mode of locomotion.
B. morphology.
C. mode of nutrition.
D. method of sexual reproduction.

8. The group of Fungi in which sexual reproduction has not been observed is
A. Ascomycetes.
B. Deuteromycetes.
C. Zygomycetes.
D. Basidiomycetes.

9. Deuteromycetes has been further classified using
A. DNA probes.
B. rRNA analysis.
C. Southern blotting.
D. replica plating.

10. The terms yeast, mold, and mushrooms refers to fungal
A. reproduction.
B. morphology.
C. nutrition.
D. parasites.

11. A tangle of fungal hyphae is generally known as a
A. bud.
B. mycelium.
C. germ tube.
D. spore.

12. Dimorphic fungi
A. may grow as mycelia or yeast.
B. are often associated with disease in humans.
C. are mushrooms.
D. are strictly hyphae.
E. may grow as mycelia or yeast AND are often associated with disease in humans.

13. Fungal spores are a major cause of
A. anaerobic disease.
B. fermentation.
C. food spoilage.
D. asthma.

14. The pH at which most fungi thrive is
A. 3.0.
B. 5.0.
C. 7.0.
D. 8.0.

15. Lichens may be an association of
A. several different fungi.
B. protozoa and bacteria.
C. algae and fungus.
D. virus and algae.

16. Mycorrhizae
A. are vital for the survival of lichens.
B. are vital for the survival of many plants.
C. increase the absorptive ability of roots.
D. are used in the production of wine, beer, and bread.

E. are vital for the survival of many plants AND increase the absorptive ability of roots.

17. Haustoria
A. are a form of parasitic protozoan.
B. refers to the reproductive structure formed by slime molds.
C. are specialized hyphae used by parasitic fungi.
D. are the reproductive form of protozoans.

18. Fungi capable of dimorphism grow either as
A. rhizoids or hyphae.
B. yeast-like or mycelium.
C. germ tubes or buds.
D. spores or mushrooms.

19. Fungal diseases are generally referred to as
A. mycoses.
B. infections.
C. systemics.
D. infestations.

20. Aflatoxins
A. are produced by Aspergillus.
B. are possible carcinogens.
C. may be found in peanuts.
D. are toxins.
E. All of the choices are correct.

21. Fungi that are important for fermentation of fruits
A. are yeasts.
B. are facultative anaerobes.
C. grow well at acid pH.
D. secrete enzymes that degrade organic molecules.
E. All of the choices are correct.

22. Coccidioidomycosis is
A. a fungal disease.
B. a protozoal disease.
C. caused by Coccidioides sp.
D. caused by Candida sp.
E. a fungal disease AND caused by Coccidioides sp.

23. Fungi are important in
A. food production.
B. food spoilage.
C. production of antibiotics.
D. disease of plants.
E. All of the choices are correct.

24. Fungi are important because of their ability to
A. help many plants grow.
B. cause disease in plants.
C. make certain foods and beverages.
D. spoil food.
E. All of the above.

25. Algae are important environmentally as
A. major producers of carbon dioxide.
B. major producers of oxygen.
C. local flora.
D. local contaminants.

26. Free-floating, photosynthetic organisms found in marine environments are
A. Bucella.
B. blue-green algae.
C. krill.
D. phytoplankton.

27. Algae
A. often grow in areas where other forms of life may have difficulty.
B. are strictly macroscopic organisms.
C. have a vascular system similar to plants.
D. are only found in the soil.

28. Macroscopic algae possess a special structure that acts as an anchor and is commonly called
A. a thallus.
B. a holdfast.
C. roots.
D. the stipe.

29. Agar is obtained from
A. bacteria.
B. algae.
C. protozoans.
D. plants.

30. Diatoms are algae whose silicon dioxide-containing shells are useful economically as
A. filters.
B. fertilizers.
C. stabilizers.
D. thickeners.

31. The site in a photosynthetic eukaryotic cell where photosynthesis occurs is the
A. nucleus.
B. carotenoid.
C. mitochondria.
D. chloroplast.

32. Sexual reproduction in algae utilizes meiosis that results in the production of
A. spores with twice as much DNA as the parental cells.
B. gametes with half the amount of DNA as in the parental cells.
C. spores with the same amount of DNA as the parental cells.
D. swarming cells with the same amount of DNA as the parental cells.

33. Paralytic shellfish poisoning occurs when humans eat shellfish that have fed on
A. Gonyaulax spp.
B. Salmonella spp.
C. Vibrio cholerae.

34. Gonyaulax
A. produces a non-protein neurotoxin.
B. infects the nervous system of humans.
C. is a dinoflagellate.
D. produces a non-protein neurotoxin AND is a dinoflagellate.

35. Organisms that may cause red tide are

A. green algae.

B. brown algae.

C. dinoflagellates

D. euglenids.

36. Single-celled eukaryotic organisms that lack chlorophyll are called
A. Algae.
B. Protozoa.
C. Chlorophyta.
D. Salmonella.

Protozoan classification used to be based on their means of

A. locomotion.
B. growth.
C. reproduction.
D. obtaining nutrients.

38. Sarcodina move by means of
A. flagella.
B. apicomplexans.
C. cilia.
D. pseudopodia.

39. Protozoans are an important part of the food chain ingesting large numbers of
A. fish.
B. bacteria and algae.
C. shellfish.
D. other protozoans.

40. The most necessary habitat requirement of protozoa is
A. moisture.
B. light.
C. temperature.
D. UV light.

41. The ability to exist as either a trophozoite or a cyst is characteristic of many
A. fungi.
B. viruses.
C. protozoa.
D. bacteria.

42. Schizogony
A. means multiple fissions.
B. is performed by bacteria.
C. is performed by protozoa.
D. is a form of reproduction.
E. means multiple fissions AND is performed by protozoa.

43. One of the greatest causes of human deaths through time has been due to
A. Giardia spp.
B. Histoplasma spp.
C. Trypanosoma spp.
D. Plasmodium spp.

44. Convergent evolution
A. explains the morphological similarity yet major genetic differences found between slime molds and fungi.
B. refers to two different organisms that develop similar characteristics in adaptation to similar environments.
C. explains the structure of lichens.
D. refers to the one organism dividing into two.
E. explains the morphological similarity yet major genetic differences found between slime molds and fungi AND refers to two different organisms that develop similar characteristics in adaptation to similar environments.

45. When cellular slime molds run out of food, they form a
A. plasmodium.
B. slug.
C. myxamoeba.
D. rhizoid.

46. Lyme disease is transmitted by
A. ticks.
B. lice.
C. mosquitoes.
D. fleas.

47. Pediculus humanus
A. only uses humans as a host.
B. is carried by mosquitoes.
C. only infects hands.
D. can transmit a bacterial disease.
E. only uses humans as a host AND can transmit a bacterial disease.

48. Lice and mites
A. are both arachnids.
B. may both be spread by personal contact.
C. are intestinal parasites.
D. cause Lyme disease.

49. Which are not arthropods?
A. Mosquitoes

B. Fleas

C. Lice

D. Ticks

E. Flukes

50. Sarcoptes scabiei
A. transmit bacterial disease.
B. are responsible for scabies.
C. infect the blood.
D. are transmitted by mosquitoes.

51. Fleas
A. may transmit Yersinia pestis.
B. may transmit Lyme disease.
C. may transmit a toxin.

52. Nematodes
A. are roundworms.
B. are found in the gastrointestinal tract or the blood.
C. are carried by bacteria.
D. have flat segmented bodies.
E. are roundworms AND are found in the gastrointestinal tract or the blood.

53. Tapeworms
A. have a complicated digestive system.
B. do not have a digestive system.
C. may be transmitted by eating undercooked meat.
D. have a larval stage known as a cercaria.
E. do not have a digestive system AND may be transmitted by eating undercooked meat.

63. Why would all protozoa be expected to require large amounts of water in their habitats?
A. They require water to avoid dehydration and death. Without being in water, they would quickly dehydrate (due to their small size) and die.
B. They require water to help them during photosynthesis by providing an electron source.
C. They require water to move around in to seek food particles. Without water, they would be unable to move at all.
D. All of the above are correct.

64. Are all fungi detrimental (bad) for other organisms?
A. Yes-think of molds that destroy plant crops, or fungal infections that cause athlete's foot. All fungi are bad for organisms they colonize.
B. Yes-fungi feed directly on organic material (oftentimes killing it or feeding on it after the original organism has died). As such, they are always bad for other organisms.
C. No-fungi are sometimes good, sometimes bad for other organisms. It really depends on which fungus you're talking about and the relationship it has with the other organism. Some fungi, for example, can form a symbiotic relationship with plant roots that increases their nutrient and water absorption. This is good.
D. No-fungi are ALWAYS good when they interact with other organisms. There's never a downside or negative aspect to such interactions. Both sides always benefit from the relationship.

65. Why were the slime molds and water molds once considered to be fungi?
A. Early identification methods focused on appearances rather than biochemical characteristics.
B. Early identification methods focused on appearances rather than genetic similarities/differences.
C. They ARE fungi.

66. How would increased travel lead to increased spread of multicellular eukaryotic parasites?
A. Many eukaryotic parasites are transmitted directly from person to person via airborne transmission-so getting an infected individual onto a plane of susceptible individuals would increase spread.
B. Many eukaryotic parasites depend on vectors (often small blood-sucking insects) for transmission-so moving an infected individual into an area with new populations of vectors and new susceptible humans would increase the spread of the illness.

C. It really would NOT-most individuals are screened for parasitic infections prior to traveling out of highly infected areas. We also have quarantine abilities at customs stations for individuals entering the United States.

Why would it be more difficult to treat diseases in humans caused by members of the Eukarya than diseases caused by the Bacteria?

A. Multicellular organisms always have their own immune systems to contend with-so any treatment we develop needs to overcome this built-in protection mechanism in such organisms.
B. Since bacteria are so much simpler (being single-celled), they are inherently easier to kill off than multi-cellular eukaryotic microbes.
C. Eukaryotic microbes use many of the same enzymes and systems as humans-so we lose the ability to target certain molecules that might be present ONLY in the cell type we want to eliminate. There's too much overlap when both organisms are eukaryotic.
D. Eukaryotic microbes (unlike prokaryotes) often secrete compounds that breakdown and eliminate drugs used against them. This makes them much harder to effectively eliminate than bacteria.