Which of the following describe l existing bacteria? A) extremophiles, tiny, abundant B) tiny, ubiquitous, metabolically diverse C) morphologically diverse, metabolically diverse, extremophiles D) pathogenic, omnipresent, morphologically diverse You have found a new prokaryote. What line of evidence would support your hypothesis that the organism is a A) It lacks cell walls. B) It is able to form colonies and produce oxygen. C) It is an endosymbiont D) It forms chains called mycelia. Which statement about the domain Archaea is true? A) The genomes of archaeans are unique, containing no genes that originated within bacteria. B) No archaeans can inhabit solutions that are nearly 30% salt C) No archaeans are adapted to waters with temperatures above the boiling point. D) Genetic prospecting has recently revealed the existence of many previously unknown archaean species. Which of the following traits do archaeans and bacteria share? A) composition of the cell wall B) composition of the cell wall and lack of a nuclear envelope C) presence of plasma membrane and composition of the cell wall D) lack of a nuclear envelope and presence of plasma membrane Assuming that each of these possesses a cell wall, which prokaryotes should be expected to be most strongly resistant to plasmolysis in hypertonic environments? A) methanogens B) cyanobacteria C) extreme thermophiles D) extreme halophiles The thermoacidophile Sulirolobus acidocaldarius lacks peptidogycan, but still possesses a cell wall. What is likely to be true of this species 1. It is a bacterium. 2. It is an archaean. 3. The optimal pH of its enzymes will lie above pH 7 4. The optimal pH of its enzymes will lie below pH 7 5. It could inhabit certain hydrothermal springs. 6. It could inhabit alkaline hot springs. A) 1, 3, and 5 B) 1, 3, and 6 C) 1, 4, and 5 D) 2, 4, and 5 A fish that has been salt-cured subsequently develops a reddish colour. You suspect that the fish has been contaminated by the extreme halophile Halobactenium. Which of these features of cells removed from the surface of the fish, if confirmed, would support your suspicion? 1. the presence of the same photosynthetic pigments found in cyanobacteria 2. cell walls that lack peptidoglycan 3. cells that are isotonic to conditions on the surface of the fish 4. cells unable to survive salt concentrations lower than 9% 5. the presence of very large numbers of ion pumps in its plasma membrane A) 1, 4, and 5 B) 2, 3, 4, and 5 C) 2 and5 D) 3 and4

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