Giardia lamblia and Trichomonas vaginalis are commonly seen flagellates. Their life cycles include cyst and trophozoite forms. The infective form of Trichomonas vaginalis is a ______, thus this flagellate must be passed from person to person.
A) Cyst
B) Trophozoite
B) Trophozoite
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An aquatic ecosystem that may include protists and bacteria as producers in a well-lit zone and detritus feeders in a
deeper dark zone is a(n) ____.
a. estuary b. stream c. lake d. coral reef e. hydrothermal vent
The process of filtration in the glomerulus is
driven by a. active transport. b. blood pressure. c. osmosis. d. dialysis. e. sodium-potassium pumps
Karyogamy produces a _____.
a) diploid zygote b) haploid zygote c) spores d) mycelium e) hypha
Aspen trees are the most widely distributed tree in North America. A forest of many aspen trees, some of which may be tens of thousands of years old, is actually one single clone. What is likely to be the greatest threat to the long-term survival of aspen forests?
A) insects, which may bore holes in the stems of trees B) climate change, which alters aspen trees' typical moist and cool environment to dry and warm C) a fungus that is often found associated with roots of some trees in the stand D) lack of pollinators