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The passageways in the nuclear envelope for movement of substances between the nucleus and cytoplasm are called nuclear ______.


A) histones
B) pores
C) chromatin
D) endoplasmic reticulum
E) inclusions

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Mitochondria possess all of the following except ______.


A) cristae
B) 70S ribosomes
C) enzymes for photosynthesis
D) electron carriers
E) metabolic enzymes

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Which of the following statements is correct?


A) All saprobes are heterotrophic, but only some are parasitic.
B) All heterotrophs are fungi, and include both parasites and saprobes.
C) All heterotrophs are parasites, but only some are saprobes.
D) All fungi, whether parasite or saprobe, are heterotrophs.

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Chitin is a chemical component of the cell walls of ______.


A) helminths
B) protozoa
C) algae
D) fungi
E) bacteria

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After returning from a trip to Africa,Tom feels tired and weak and has severe anemia.A blood smear reveals a protozoan in his blood and the health care provider diagnoses malaria.Which of the following could be the causative agent of this disease?


A) Plasmodium vivax
B) Giardia lamblia
C) Trichophyton rubrum
D) Taenia solium
E) HIV

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The eukaryotic cell membrane is composed of ______.


A) sterols
B) proteins
C) phospholipids
D) sterols, proteins, and phospholipids
E) sterols and phospholipids only

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All fungi can form hyphae.

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In humans,helminths generally infect the ______.


A) nervous system
B) gastrointestinal tract
C) skin
D) urinary tract
E) muscular system

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Chloroplasts are composed of membranous sacs called ______ that carry chlorophyll.Surrounding these sacs is a ground substance called ______.


A) thylakoids; stroma
B) grana; stroma
C) cristae; matrix
D) cristae; stroma
E) thylakoid; matrix

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You are observing an organism under the microscope,and it is clearly multicellular with no cell walls.Your prediction is that this organism is a(n) ______.


A) alga
B) fungus
C) helminth
D) protozoan
E) bacterium

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The drug cytochalasin targets actin filaments in the cytoskeleton,preventing them from forming.Treatment of a cell with cytochalasin would result in its inability to ______.


A) form cellular extensions
B) transport substances within the cell
C) form the nuclear envelope structure
D) prevent mutations in its chromosome

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Pfiesteria is a(n) ______ that produces a toxin harmful to humans.


A) endospore
B) protozoan
C) helminth
D) fungus
E) alga

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