28.1
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20 terms
Terms | Definitions |
|---|---|
 Protists are alike in that all are | e. eukaryotic. |
| Which of the following statements concerning living phytoplanktonic organisms are true? | d. 2, 3, and 5 |
| Biologists have discovered the kingdom Protista to be paraphyletic. Which of the following statements is true, and consistent with this conclusion? | e. The protists arose from a common ancestor that was a parabasalid. |
| The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the following? | b. mitochondria and chloroplasts |
| According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate? | b. from engulfed, originally free-living prokaryotes |
| Which of the following statements is consistent with the hypothesis that certain eukaryotic organelles originated as prokaryotic endosymbionts? Such organelles | b. can be cultured on agar since they make all their own proteins. |
| Which process allows nucleomorphs to be first reduced, and then lost altogether, without the loss of any genetic information from the host cell that ultimately surrounds the nucleomorph? | b. horizontal gene transfer |
| Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes? | e. cyanobacteria |
| The chloroplasts of modern plants are thought to have been derived according to which sequence? | a. cyanobacteria green algae green plants |
| A mixotroph loses its plastids yet continues to survive. Which of the following most likely accounts for its continued survival? | c. It engulfs organic material by phagocytosis. |
| A biologist discovers a new unicellullar organism that possesses more than two flagella and two small, but equal-sized, nuclei. The organism has reduced mitochondria and no chloroplasts. How would you classify this organism? | b. diplomonad |
| Which two genera have members that can evade the human immune system by frequently changing their surface proteins? | b. 1 and 4 |
| Which of the following marine organisms produce potent neurotoxins that cause extensive fish kills, contaminate shellfish, and create severe respiratory irritation to humans along the shore? | b. dinoflagellates |
| Which of the following is mismatched? | d. ciliates-red tide organisms |
| Which of the following statements about dinoflagellates is false? | e. Their fossil remains form limestone deposits. |
| Which group(s) within the Alveolata include(s) members that are important in ocean food webs, cause(s) red tides that kill many fish, and may even be carnivorous? | c. dinoflagellates |
| Which of the following statements concerning protists is false? | b. The organism that causes malaria is transmitted to humans by the bite of the tsetse fly. |
| You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile, using many short extensions of the cytoplasm, each featuring the 9+2 pattern. It has well-developed organelles and three nuclei, one large and two small. This organism is most likely to be a member of which group? | c. ciliates |
| Which of the following is not characteristic of ciliates? | c. They can exchange genetic material with other ciliates by the process of mitosis. |
| Which process results in genetic recombination, but is separate from the process wherein the population size of paramecium increases? | d. conjugation |
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