Exam 1 Review - Chapter 1(pgs.2-4 5-6 19:24:00 ←...

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Unformatted text preview: Chapter 1 (pgs.2-4, 5-6) 13/02/2008 19:24:00 ← Characteristics of Living Organisms • Contain biomolecules o Nucleic acids, proteins, carbohydrates, lipids • Composed of cells o RedBC – Disks & WhiteBC – Sphere – Division, Reproduction, Growth, and Repair • Reproduce • Acquire and use energy and raw materials o Metabolic activities – organisms extract energy from nutrients and change it to do other kinds of work • Respond to stimuli o Sensory organs used to detect stimuli • Maintain homeostasis o Maintain stable and internal environment (if hot, cool yourself off) • Populations evolve o Individuals with heritable traits are most likely to survive – their traits will get passed on ← ← Hierarchical Organization of Life • Subatomic particles (protons, electrons, neutrons) • Atom • Molecule (Chemical component of cells) • Cell (Smallest unit of life) • Tissue (Group of similar cells that perform the same function) • Organ (Structure with two or more tissues working together to perform a function) • Organ system (At least two organs working together to perform a function) • Individual (multicellular organism) – Single organisms • Population (all individuals of the same species in an area) • Community (All the species in an ecosystem that can interact) o All the species that live and interact in an alpine meadow • Ecosystem (A community and its physical life) o All the living organisms in a defined area and their physical environment o Whole earth, a particular forest, single rotting log within a forest • Biosphere (The part of the earth that supports life) Chapter 2 (pgs 15-34) 13/02/2008 19:24:00 ← Atoms (Typically have an overall neutral charge) • Building blocks of matter • Composed of subatomic particles (protons, neutrons, electrons) • Cannot be broken down into simpler substance by ordinary chemical means ← ← Atomic Structure: • Atomic nucleus • Electron shells (“cloud”) • Subatomic particles ← ← Atomic Nucleus • At the center of the atom • Contains protons and neutrons ← ← Electron Shells “Cloud” • Electrons occupy the space around the nucleus in regions called “shells” • If the atomic number (# of protons) is known then the number of electrons floating around is the same o First shell – 2 electrons o Second shell – 8 electrons o Outermost shell – 8 electrons o Atoms with more than 10 electrons have additional shells ← ← Subatomic Particles (AMU – Atomic mass unites) Particle Charge Mass Location Protons +1 1 amu/Dalton Nucleus Neutrons 1 amu/Dalton Nucleus Electrons-1 Negligible “e-cloud” ← ← ← Element • Form of matter containing only one kind of atom...
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Exam 1 Review - Chapter 1(pgs.2-4 5-6 19:24:00 ←...

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