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3.1a Construct a biological key for separation of organisms in kingdom Protista into phyla. You can assume that any organism for which you use the key is already known to be in kingdom Protista. You can also assume that if an organism is completely
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3.1b autorophic it belongs in subkingdom Algae, but if it is at all heterotrophic it belongs in subkingdom Protozoa. With those assumptions, you should be able to use the characteristics in Figure 3.1 to construct the questions for the key.
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Biology OYO
Module 3
| Question | Answer |
|---|---|
| 3.1a Construct a biological key for separation of organisms in kingdom Protista into phyla. You can assume that any organism for which you use the key is already known to be in kingdom Protista. You can also assume that if an organism is completely | 3.1a |
| 3.1b autorophic it belongs in subkingdom Algae, but if it is at all heterotrophic it belongs in subkingdom Protozoa. With those assumptions, you should be able to use the characteristics in Figure 3.1 to construct the questions for the key. | 3.1b |
| 3.2 Suppose your were observing anamoeba under the microscope and it suddenly exploded. What organelle was probably not working properly in the amoeba? | The contractile vacuole. |
| 3.3 A biologist is studying an amoeba and sees a vacuole with several small solid objects in it. Most likely, what kind of vacuole is it? | The food vacuole. |
| 3.4 A euglena is in dim light. There is a bright spot of light not too far away, but the euglena does not move towards it. Instead it seems to wander aimlessly. What organelle is not functioning properly in the euglena? | The eyespot. |
| 3.5 According to most biologists, an organism must always perform photosynthesis or chemosynthesis to be considered autotrophic. Why do these biologists say that the euglena is not autotrophic? | Because they are also saprophytes, organisms that feed on living matter. |
| 3.6a In a later section of this module, you will learn about members of genus Plasmodium, which can live in people. These microorganisms get food and shelter from the people they inhabit, but they cause malaria, which can be deadly. | |
| 3.6b Is this an example of symbiosis? If so, what kind? | Yes. Parasitism. |
| 3.7 A paramecium cannot conjugate. What organelle is not functioning properly? | The oral groove. |
| 3.8 A biologist studies a group of bacteria(all one species)and a group of paramecia(all one species). She notices that while the bacteria all seem to be almost exact duplicates of each other, there is a great deal of variation among the paramecia.Why? | Because the paramecia conjugate, exchange DNA, right before they reproduce asexually. |
| 3.9 What is the difference between cysts (such as those formed by amoebae and ciliates) and spores? | A cyst protects a mature organism, but a spore is a reproductive cell with hard, protective coating. |
| 3.10 One way that people fight the spread of malaria is to significantly reduce the population of mosquitoes in their vicinity. Why does this work? | Because mosquitoes spread malaria from person to person. |
| 3.11 If an organism is in phylum Chlorophyta, it must have a chloroplast. Why? | Because that's where it stores its chlorophyll. |
| 3.12 Of the three genera of green algae previously dicussed, Chlorella, Desmid, and Spirogyra, which would you consider the most complex? | I would consider two, Chlorella for its life habitat, and Desmid for its design. |
| 3.13 You might say that diatoms are the most important form of algae in creation. Why? | Because they are the greatest producers of oxygen in creation. |
| 3.14a Suppose you could analyze a water sample for the presence of any chemical. If you were given two samples, one that contained members of phylum Chlorophyta and another that contained members of phylum Chrysophyta, | |
| 3.14b how could you determine which was which? | The Chlorophyta has a cell wall composed of cellulose and the Chrysophyta has a cell wall composed of silicon dioxide. |
| 3.15a In the book of Exodus (chapter 7), God caused several plagues to befall Egypt. In the first plague, all of the rivers turned to blood, the fish died, and the Egyptians could not drink from the rivers. | |
| 3.15b Some have said that algae offer a natural explanation for this miracle. What algae are they referring to and why do they think this? Why is this not a good explanation? | They are referring to the algae called dinoflagellates because it is the most logical explanation to them. The Bible specifically says that the river turned to blood. |
| 3.16a A biologists has a sample of what looks to be a marine plant. He thinks, however, that it might be an unknown species of brown algae. To test this, he takes part of the "plant," dries it, crushes it into a powder, and mixes it with a solution. | |
| 3.16b The solution thickens. Is this evidence that the organism is a plant or an alga? Why? | It is an alga because one characteristic of algae is that it can be used as a thickening agent. |
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LiseBrinkley
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