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| Frage | Antworten |
| what two photosynthetic groups do we examine in this lab? | Diatoms and Brown Algae |
| these two stramenophiles are part of what super group? | Chromalveolata |
| what color are diatoms when they are alive? why? | yellow or brown because of accessory photosynthetic pigments |
| what do diatoms have that remain after they die? | a glass-like test made of two silica halves that fit together like a petri dish. they can be very elaborate and beautiful |
| what happens to these tests after the diatoms dies? | the settle to the bottom of bodies of water and become part of a huge amount of sediment called diatomaceous earth which is commercially harvested for use for filtration, painting filler, paper products, and in insulation. |
| what are the two basic shapes of diatoms? | circular and square |
| how are diatoms classified or named in taxonomy? | based on where there markings are on there valves and what the valves look like |
| all brown algae are? | multicellular photoautotrophs |
| Diatom tests | |
| what is brown algae brown? | an excess of the photosynthetic pigment fucoxanthin |
| what kind of life cycle do they use? | alternation of generation lifecycle |
| the structure of the seaweed is like a true plant but? | it does not have true stems, leaves, or roots |
| the body of the seaweed is called the? | thallus |
| what is the stem-like structure that is part of the thallus called? | the stipe |
| the leaf-like structures that are supported by the stipe are called? | blades |
| the root-like portion that anchors the seaweed is called? | the holdfast |
| what is brown seaweed used for commercially? | a polysaccharide in the cell wall is used as a thickening agent in toothpaste, icecream, pudding and other foods. |
| what tow species of brown algae do we use? | Fucus sp. from the west coast of BC and is used in packing live crabs and shellfish. Also Laminaria sp. which is used in soup in Japan and Korea |
| what happens to brown algae when its put in hot water? | the brown pigment leeches out so the plant becomes a yellowing green as the secondary pigments can now be seen |
| next we study glaucophytes, which are part of what super group? | Archaeplastida |
| Fucus sp. brown algae | |
| Laminaria sp. brown algae | |
| Glaucophytes are said to have evolved early and they do not have chloroplats. What do they use for photosynthesis? | the cyanelle organelles |
| what are cyanelle organelles similar to? why? | cyanobacteria. they are similar in size, their peptidoglycan wall between the cyanelle membranes, both have circular prokaryotic DNA, and the same pigmentation. |
| how are cyanelle organelles similar to chloroplasts? | they have a similar gene number, genome size, how they import proteins, and they can't live outside the organism. |
| what species of glaucophytes do we study? | Glaucocystis sp. |
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Image:
bio_flashcards_P (image/jpg)
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Glaucocystis sp. |
| the second group we study from the supergroup Archaeplastida is? | Red algae |
| Red algae are? | multicellular photoautotrophs that live in marine environments. |
| unlike other algae groups red algae do not have? | a flagellum at any point in the life cycle |
| Is red algae always red? | no. all red algae has the accessory pigment phycoerythrin which can make it red, but based on other pigments present, the algae can also be green, black, or blue. the environment and water depth can also effect the color |
| what species of red algae do we study? | Porphyra sp. |
| what is porphyra sp. used for? | also called nori, it is used for wrapping sushi |
| what other red algae do we study? what is is used for? | Palmaria sp. is used like Porphyra sp, to thicken milk and dairy products using its agar from its cell walls |
| Porphyra sp. | |
| Palmaria sp. | |
| what is the third group we examine from the supergroup Archaeplastida? | green algae |
| we study three green algae species what is the first? | Chlamydomonas sp. |
| chlamydomonas sp. is? | a small egg shaped, single celled chlorophyte |
| describe the structure of chlamydomanas sp. | two flagella for moment on the pointy end of the cell. on the blunt end there is a large egg shaped chloroplast. there is a large nucleus in the middle of the cell |
| what are pyreonoids? | parts of the chloroplast where starch is made |
| Chlamydomonas sp. | |
| what is a volvo sp. | a freshwater colonial green algae. the colony is a hollow ball with thousands of vegetative cells all held together |
| how are the cells joined together? | thin strands of cytoplasm |
| where are the reproductive cells? | the rear of the colony. the front only has vegetative cells |
| how are newer daughter colonies produced? | either sexually or asexually inside the parent colony and are released when the parent colony breaks down. |
| Volvox sp. | |
| what is the third species of green algae we study | Ulva sp. |
| Ulva sp. is? | a multicellular marine green algae also called sea lettuce |
| what is the structure of a Ulva sp. like? | the standard seawee structre with a thallus, a rooted holdfast, a stipe, and blades |
| what kind of life cycle does a Ulva sp. have? | a complex alternation of generation lifecycle |
| Ulva sp. |
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