exam 1 review

exam 1 review - 1 Metabolism the total chemical activity of...

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1. Metabolism: the total chemical activity of an organism. It consists of thousands of chemical reactions that must be coordinated by genes 2. Atoms and molecules 3. Subatomic particles: protons (+), Neutrons (0), Electrons (-) 4. Elements and compounds 5. The hierarchy of the units of life a. Molecules, made up of atoms b. Cells c. Tissue d. Organs e. Organism f. Population g. Communities h. Biosphere 6. major events in the history of life on earth a. life arose from nonlife about 4 billion years ago by means of chemical evolution b. biological evolution began about 3.8 billion years ago when interacting systems of molecules became enclosed in membranes to form cells c. photosynthetic prokaryotes released large amounts of oxygen into Earth’s atmosphere, making aerobic metabolism possible d. Complex eukaryotic cells evolved by incorporation of smaller cells that survived being ingested. e. Multicellular organisms appeared when cells evolved the ability to transform themselves and to stick together and communicate after they divided. The individual cells of multicellular organisms became modified to carry out varied functions within the organism f. The evolution of sex sped up rates of biological evolution 7. the scientific method, including hypothesis-prediction a. Make observations b. Ask questions c. Form hypotheses d. Make predictions based on hypotheses e. Test predictions 8. Darwin’s view of differential reproductive success and evolution: believed in Natural Selection 9. natural selection a. Individuals within a species vary b. They compete for limited resources c. Those with traits best suited for competition will survive d. This results in changes in the make up in the gene pool of that species 10. domains of life a. i. Differ so fundamentally from one another in the metabolic processes b. Eukarya
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i. Has eukaryotic cells ii. Four groups: 1. Protista: single celled organisms 11. Kingdoms of life a. Plantae: photosynthesis called autotrohps b. Fungi: mold, mushroom, yeast, other heterotrophs. They break down food molecules; important as decomposers c. Animalia: heterotrophs that ingest food source 12. what determines the chemical behavior of an atom 13. electrons and electron “shells” a. energy levels around the nucleus. 1
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This note was uploaded on 03/31/2008 for the course BSC 1010 taught by Professor Presley during the Spring '06 term at Virginia Tech.

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exam 1 review - 1 Metabolism the total chemical activity of...

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