quiz_3 - between the body and the environment. Some obvious...

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Name_____________________________  BIOLOGY 325H QUIZ 3  [5 pts] _____________________________________________________________ 1.  [2 pts]  Name at least two adaptations that animals use to prevent the loss  of heat from their bodies to  the external environment. There are several: - coverings of the body surface that provide insulation, such as fur, feathers, and subcutaneous fat - acquiring artificial coverings (e.g. clothing) - reduce blood flow to the skin - reduce sweating - seek out microenvironments with a higher ambient temperature ( e.g.  a hot spring) NOTE: the generation of additional body heat (e.g. shivering) is not the same thing as reducing the   loss of body heat.  2.  [2 pts] Certain organs in an animal's body can be described as "chemical exchange systems". Name one organ  that functions as a chemical exchange system, and name at least one molecule that it exchanges 
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Unformatted text preview: between the body and the environment. Some obvious examples: Lungs or gills - O 2 and CO 2 Small intestine (digestive system) - glucose, amino acids, nucleic acids, fatty acids Kidneys (excretory system) - urea, creatinine, H 2 O and salts 3. [1 pt] Oxidative metabolism can generate 18X as much ATP as non-oxidative metabolism starting from the same amount of glucose. Given the poor efficiency of non-oxidative metabolism, why haven't all of the anaerobic bacteria gone extinct? Name_____________________________ The Earth offers a vast array of differing habitats, and some of those habitats have very low O 2 partial pressure. Anaerobic bacteria are better adapted to live in those places than aerobic organisms, and hence out compete them....
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This note was uploaded on 04/07/2008 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas.

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quiz_3 - between the body and the environment. Some obvious...

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