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8 Cards in this Set
- Front
- Back
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Name three groups of the kingdom Protista and their characteristics.
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Algae, protozoa, and slime molds.
Algae are unicellular but can grow in large groups, such as seaweed. Protozoa are unicellular protists that lack photosynthetic ability and use their organelles of motility for both locomotion and food gathering. Slime molds are much like fungi because they usually grow on dead matter and produce spores; they are unlike fungi, however, because some mold forms have flagella or pseudopodia. |
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Explain three types of protozoal locomotion.
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Some protozoans move by flagella or the shorter, but similar, cilia structure. These structures beat back and forth by sliding pairs of microtubules against one another to make the flagella or cilia push against the water like a fish's tail or a swimmer's legs. The other type of motility is produced by pseudopodia, which are cell membrane extensions that move forward to attach a surface so that the rest of the cell can be pulled to that position in a crawling motion.
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What role do algae play in general marine life?
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Algae along with other organisms in plankton, use the Sun's energy to produce most of the organic material and oxygen available in the ocean. They are primary food sources for many of the ocean's inhabitants.
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What are algal cells made of?
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Algal cells walls are mainly composed of cellulose. Agar and pectin are also present. Members of the diatom subgroup of algae have a silicon cell wall similar to silicon found in glass and rocks.
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How do algae obtain and use sunlight?
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Algae obtain and use sunlight through chlorophyll in organelles called chloroplasts that absorbs the energy in sunlight. The chlorophyll transfers the energy on to mitochrondria that convert it into chemical energy in the form of ATP.
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How are protozoans generally classified?
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Protozoans are classified according to their locomotion apparatus. Flagellates have flagella; pseudopods have pseudopodia; ciliates have cilia; and sporozoites have no organelles of locomotion.
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How are protozoan groups commonly identified?
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Protozoan groups are commonly identified by their locomotion apparatus, general shape and size, number of nuclei, and presence of cyst forms.
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How do cellular and acellular slime molds differ?
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Cellular slime molds grow in groups of individual cells, whereas acellular slime molds grow into a plasmodium, a giant cell containing many nuclei
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