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Unformatted text preview: Biology 1002 Test 1 Notes The thing is very clear, the more biologists looks, the more species are found. There are about 1.8 million unidentified species and possibly 5 to 50 times more which havent yet been studied. The incredible number of species and the ways that they all interact form the basis of biodiversity . Biodiversity- species interact together when theyre present in the same ecosystem. They interact in bad ways (infections), benign ways (no effect whatsoever), and in beneficial ways (bacteria in your large intestine). Since prehistoric times, people have been studying, observing, and recording the species around them. The aspect of species-species interaction is a very intricate idea that biologists have trouble studying. The planet is rich with species and they are found in almost every possible natural habitat. Even places that seem inhospitable have numerous organisms interacting. When we look at species we already know about, we are losing them at a remarkable rate. We have been losing species at an alarming rate and we are just beginning to realize that there are some very important relationships between species. The loss of one species may result in the subsequent loss of other species. We feel powerless in a lot of respects to stop this. Out of sight, out of mind. Species that havent been examined, identified, characterized, studied, etc. are being lost all over the world. Most drugs are originally from fungal and plant sources. Things we are doing on the planet is causing mass extinctions equivalent to that of an asteroid, etc. Microorganisms consist of organisms that are too small to be seen clearly without a microscope. These microorganisms include: Prokaryotes- range in size from 2-10 micrometers in diameter Eukaryotes- unicellular eukaryotic organisms of the kingdom protista that are in the 10- 100 micrometer range (fig. 19-1) Most of the time, bacteria is of no effect at all, or is beneficial. There are groups of biological entities that are even smaller than bacteria. These groups are: Viruses Viroids Prions Some are pathogens that can make organisms sick. These are not organisms because they dont have. A virus particle is small (.05-2 micrometers) and comes in many different shapes (fig. 19-3). These particles have 2 parts: Genome- genetic information that can be DNA or RNA (ds or ss) Capsid- protein coat surrounding and protecting genome, makes up shape of virus Some viruses have an envelope- membrane (phospholipid bilayer) that surrounds the capsid....
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This note was uploaded on 04/07/2008 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.
- Spring '08