Bio Lab Wksht & HW Questions 26

Bio Lab Wksht - Although similar to green algae which you will observe later in their possession of both chlorophyll a and b euglenoids differ in

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21 C. The Diversity of Protists: You will observe a variety of protist groups based on the current phylogeny given in Campbell and Reece (2005). Protists are the oldest and most diverse of the eukaryotes. Think about this diversity as you look at the different specimens. They are mostly microscopic unicellular organisms but there are also more complex colonial and multicellular forms. Remember that protists probably share common ancestors with the multicellular plants, animals, and fungi. Later on in the semester as you learn about each of these other Kingdoms you should be able to observe characteristics in the protists that distinguish them from plants, animals and fungi. C-1. Kingdom Euglenozoa: Euglenozoa consists of two major groups of protists, the euglenoids and the kinetoplastids (not observed in lab). Members of Euglenozoa can be photosynthetic or heterotrophic (obtain food from other organisms). Like many other protist groups, euglenozoans possess flagella that are used for locomotion.
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Unformatted text preview: Although similar to green algae, which you will observe later, in their possession of both chlorophyll a and b , euglenoids differ in that they do not have a cell wall composed of cellulose as green algae do, and they store their energy as paramylon rather than as starch. It is now thought that ancestral euglenoids ingested green algae, and subsequently (by endosymbiosis) formed a stable relationship with the former green algal chloroplasts. Prepare a wet mount slide of Euglena and examine using the 40X objective lens. Draw living members of Euglena . Notice the flexibility of the cell wall. This is due to the presence of a series of flexible protein strips that, in conjunction with the cell membrane, form a structure termed the pellicle . Watch Euglena move through the culture. Prepare another wet mount, but add a drop of methyl cellulose to your slide. Can you see the flagella , the chloroplasts , and the eyespot ?...
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This note was uploaded on 12/27/2011 for the course BSC 1020 taught by Professor Danmoon during the Fall '11 term at UNF.

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