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protista q&A
protista q&a (monera)
| Question | Answer |
|---|---|
| What two kingdoms may algae belong to and why | Algae are frequently classified in either the Kingdom Protista, because they are simple eukaryotes, or the Kingdom Plantae because they have cell walls and chloroplasts. |
| What is meant by "alternation of generations," and what algae demonstrate this property | Alternation of generations describes a reproductive strategy that involves a succession of haploid and diploid phases. Brown and Red Algae show alternation of generations in their life cycles. |
| What characteristics make euglenoids difficult to classify | Euglenoids are highly motile and lack cell walls, like protozoa. However, they are photoautotrophs like the algae. |
| Describe Lynn Margulis' endosymbiotic theory of chloroplast evolution | chloroplasts may have evolved when small photosynthesizing cells were engulfed by larger cells but not digested; the two types of cells developed a symbiotic relationship with the photoautotroph living inside the larger cell and gradually reduced to an o |
| Compare the processes of phagocytosis and pinocytosis | Phagocytosis is used to bring large particles into the cell and involves a bulging out of part of the cell membrane. Pinocytosis is used to bring in small particles and liquids and involves the pinching off of an invagination of the cell membrane. |
| Describe the method of transmission of African Sleeping Sickness | The protozoa responsible for the sleeping sickness, Trypanosoma gambiense, lives in the blood of animals. When an infected animal is bitten by a tsetse fly, the trypanosoma are sucked into the fly's intestines. Here they undergo a physiological change t |
| Describe the eukaryotic cilia and name two functions they perform | Eukaryotic cilia are similar in internal structure to flagella, but are much shorter and hair-like. They can be connected at the base to contractile fibers that allow them to beat in fixed patters. Cilia may be used for locomotion or to sweep food particl |
| Describe the process of conjugation and distinguish between the haploid and diploid phases | Conjugation begins when individuals of opposite mating types meet, the adhere to each other at the oral groove. The micronuclei then divide meiotically, producing four haploid nuclei each. All but one nucleus from each paramecium disintegrate. The macronu |
| Describe amebiod movement. | Helped by filaments of a structural protein called actin, the cytoplasm of a cell flows beneath the cell membrane into new pseudopods, causing the cell to move in a given direction. |
| Describe the differences between reproduction in cellular and acellular slime molds. | Cellular slime molds reproduce sexually and asexually, whereas acellular slime molds only reproduce sexually. Cellular slime molds have a haploid amebiod stage, but in acellular slime molds, the ameboid stage is diploid and multinucleate. |
| At what points in their life cycle do slime molds resemble protozoa& Fungi | slime molds resemble protozoa in their ameboid stages. However, when the develop fruiting bodies that produce spores, the resemble fungi. |
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vcopeland
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