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Lecture 8

BIOL 1202 Lecture Notes - Lecture 8: Gametophyte, Paraphyly, Mitosis

Biological Sciences
Course Code
BIOL 1202

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1. The chloroplasts of land plants are thought to have been derived according to which
evolutionary sequence?
a. Cyanobacteriagreen algaeland plants
2. Giardia intestinalis is an intestinal parasite of humans and other mammals that causes
intestinal ailments in most people who ingest the cysts. Upon ingestion, each cyst
releases two motile cells, called trophozoites. These attach to the small intestine's lining
via a ventral adhesive disk. The trophozoites anaerobically metabolize glucose from the
host's intestinal contents to produce ATP. Reproduction is completely asexual, occurring
by longitudinal binary fission of trophozoites, with each daughter cell receiving two,
haploid nuclei (n = 5). A trophozoite will often encyst as it passes into the large intestine
by secreting around itself a case that is resistant to cold, heat, and dehydration. Infection
usually occurs by drinking untreated water that contains cysts. The cysts of Giardia are
most analogous to the
a. Endospores of bacteria
3. Healthy individuals of Paramecium bursaria contain photosynthetic algal endosymbionts
of the genus Chlorella. When within their hosts, the algae are referred to as
zoochlorellae. In aquaria with light coming from only one side, P. bursaria gathers at the
well-lit side, whereas other species of Paramecium gather at the opposite side. The
zoochlorellae provide their hosts with glucose and oxygen, and P. bursaria provides its
zoochlorellae with protection and motility. P. bursaria can lose its zoochlorellae in two
ways: (1) if kept in darkness, the algae will die; and (2) if prey items (mostly bacteria) are
absent from its habitat, P. bursaria will digest its zoochlorellae. Which term best
describes the symbiotic relationship of well-fed P. bursaria to their zoochlorellae?
a. Mutualistic
4. You are given the task of designing an aquatic protist that is a primary producer. It cannot
swim on its own, yet must stay in well-lit surface waters. It must be resistant to physical
damage from wave action. It should be most similar to a(n)
a. Diatom
5. A sign on the beach states, "Beach Closed. Red Tide." The organisms interfering with
your use of this beach are probably _____.
a. Dinoflagellates
6. Which of the following pairs of protists and their characteristics is mismatched?
a. Ciliatesred tide organisms
7. Which of the following statements about dinoflagellates is true?
a. They possess two flagella
8. A large seaweed that floats freely on the surface of deep bodies of water would be
expected to lack which of the following?
a. Holdfasts
9. Which of the following is a characteristic of the water molds (oomycetes)?
a. The presence of filamentous feeding structures
10. Reinforced, threadlike pseudopods that can perform phagocytosis are generally
characteristic of which group?
a. Radiolarians and forams
11. A snail-like, coiled, porous test (shell) of calcium carbonate is characteristic of which
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