BIOL 211 Supplemental Instruction September 14, 2017 BIOL 211 Supplemental Instruction

Quick Review of Protists Ancestors of plants, fungi, and animals. They are abundant in aquatic ecosystems, autotrophic protists (algae) produce oxygen by photosynthesis, provides habitat for small fish, some protists are decomposers that are important in energy and nutrient flow pathways as well as being consumers (also important in energy and nutrient flow.)

Characteristics of Protists Eukaryotic Occur as unicellular or colonies Simple body plan Can be heterotrophic or autotrophic (algae) Autotrophic protists have chloroplasts (unlike autotrophic prokaryotes that have only chlorophyll.) They are motile – flagella, cilia, and pseudopodia Aerobic cellular respiration produces ATP Reproduce asexually by mitosis and sexually by meiosis..

Question #1 Which of the following statements are correct? In protists, cellular respiration occurs almost exclusively by anaerobic cellular respiration. b) Mitochondria are absent in all protist cells. * c) Some species of protists normally reproduce asexually by mitosis, but then reproduce sexually when environmental conditions become stressful. d) Statements a, b, and c are all correct.

Question #2 Which of the following statements accurately describes the life cycle of the protist (Plasmodium) that causes malaria? Plasmodium is transmitted to a human by a rat flea bite, Plasmodium infects human liver and blood cells, and undergoes meiosis followed by fertilization, Plasmodium is transmitted from human to a rat flea where it multiplies by mitosis in the rat flea body. b) Plasmodium is transmitted to a human by a rat flea bite, Plasmodium infects gastrointestinal cells, and multiplies by mitosis, Plasmodium is transmitted from a human to a rat flea where it multiplies by mitosis in the rat flea body. c) A human is infected with Plasmodium when water contaminated with this parasite is ingested. Plasmodium infects gastrointestinal cells, then undergoes meiosis followed by fertilization and formation of cysts. Plasmodium cysts are released into the water with human waste. * d) Plasmodium is transmitted to a human by a mosquito bite, Plasmodium infects human liver and blood cells and multiplies by mitosis, Plasmodium is transmitted from the human to a mosquito by a mosquito bite, Plasmodium undergoes fertilization and meiosis in the mosquito body.

The Dead Zone