flashcards_ch._23-34 - Characteristics of life that are...

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Characteristics of life that  are absent in a virus: Steps in a lytic cycle: How is a lysogenic cycle  different from a lytic  cycle? How do prokaryotic cells  differ from eukaryotic  cells? Contrast viroids, prions  and viruses ~ Can’t reproduce  without a host cell ~ Cannot perform  metabolic activity ~ Has DNA  or  RNA,  not both 1) attachment 2) penetration 3) replication 4) assembly 5) release Lysogenic doesn’t always  kill host cell, it is mostly  temperate Prokaryotic cells do not  have membrane bound  organelles Viroid- short RNA strand  with no protein coat Prion- only protein Viruses- larger than both What protests are  important ecologically?  why? What are three informal  groups of protests? Contrast plants and algae What is the ecological  significance of  saprotrophic fungi,  lichens, and mycorrhizae? What characteristics  distinguish fungi from  other organisms?
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Plankton are main source  of aquatic food Plant like(algae) , animal  like(protozoans), water  and slime molds Algae are single cellular,  are covered in scales,  asexual reproduction, and  have zoospores Fungi – absorb nutrients  from organic waste,  otherwise dead org. are  useless Lichens – measure air  pollution Mycorrhizae –  decomposes organic  material in soil Eukaryotes, membrane  enclosed nuclei,  heterotroph, obtain  preformed carbon  molecules produced by  other organisms Why are fungi important  to someone who had an  organ transplant? What are the most 
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This note was uploaded on 04/15/2008 for the course BIOL 111 taught by Professor Hernandez during the Spring '08 term at Abilene Christian University.

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flashcards_ch._23-34 - Characteristics of life that are...

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