BSC 2011C Chapter Notes - Chapter 28: Unikont, Archaeplastida, Excavata
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Protists diverse, mostly unicellular groups of eukaryotes: used to refer to eukaryotes that are not plants, animals, or fungi. Some are heterotrophs, absorbing organic molecules or ingesting larger food particles e. iii. This plastid-bearing lineage gave rise to two lineages of photosynthetic protists algae (red and green) Concept 28. 2: excavates include protists with modified mitochondria and protists with unique flagella: excavata clade that was originally proposed based on morphological studies of the cytoskeleton a. i. Highly modified mitochondria and possess multiple flagella a. ii. Cause numerous human diseases (chagas, sleeping sickness) a. iv. Diplomonads have reduced mitochondria called mitosomes a. iv. 1. Lacks plastids and has highly modified mitochondria a. iv. 2. Found in anaerobic environments lack functional electron transport chains and hence can"t use oxygen to help extract energy from carbs and other organic molecules a. iv. 3. Have two equal-sized nuclei and multiple flagella a. v. Parabasalids have reduced mitochondria called hydrogenosomes a. v. 1. Generate some energy anaerobically, releasing hydrogen gas as a by-product a. vi.
