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Chapter 28 - Chapter 28 Protists I Which of the following...

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Chapter 28 Protists I. Which of the following best describes most members of the kingdom Protista? a. They are multi-cellular and eukaryotic b. They are single celled and eukaryotic c. They are multi-cellular and prokaryotic d. They are single celled and prokaryotic i. These are the bacteria and Achaea II. Concept 28.1: Most eukaryotes are single-celled organisms a. Protists are more diverse than all other eukaryotes i. No longer considered a single kingdom 1. Plants, animals, and fungi = eukaryotes b. Mostly unicellular, but some colonial and multi-cellular forms III. Protists are nutritionally diverse a. Photoautotroph’s i. Contain chloroplasts, photosynthesize b. Heterotroph i. Absorb organic molecules as an energy source and as a source of carbon ii. or ingest larger particles c. Mixotrophs i. Combine photosynthesis and heterotrophic nutrition IV.Endosymbiosis in Eukaryotic Evolution a. Much Protists diversity has its origin in endosymbiosis b. Plastid – bearing lineage evolved into red and green algae c. Both underwent secondary endosymbiosis
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V. Which of the following would be a key identifying characteristic of an organelle that has undergone secondary endosymbiosis? a. Single plasma membrane b. Two plasma membranes c. Four plasma membranes d. None of the above VI.Motility in Protists a. Flagellates: move by 1 or more flagellae i. Eukaryotic Flagellum different from bacterium flagellae b. Ciliates: move by coordinated movement of cilia i. Ciliate paramecium ii. Cilia is same as flagella but much shorter and many more of them surrounding the cell c. Amoebae: move by means of pseudopodia, “false foot” i. Accomplished by extending the plasma membrane and then allowing the cytoplasm to stream into the pseudopodium and then just string along the rest of the cells VII. Sexual reproduction in Protists a. Protists will be diploid sometime in their lifetime can undergo meiosis which is capable of sexual reproduction in contrast to the prokaryotes that just reproduced asexually by binary fission b. Protists have a wide variety of life histories i. Zygotic life cycle: Haploid cells transform into gametes, gametes fuse to form zygotes (e.g. Plasmodium, which causes malaria) ii. Alternation of generations: Produce 2 types of multi-cellular organisms (n and 2n); many algae and all land plants VIII.
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