Lecture 1 - Humans in the World of Biology Biology Life...

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Unformatted text preview: Humans in the World of Biology Biology Life Living Organisms Share Basic Characteristics Contain biomolecules Composed of cells Reproduce Acquire and use energy and raw materials Respond to stimuli Maintain homeostasis Populations evolve Life Has Many Levels of Organization Life extends from the microscopic to the global scale Basic Chemistry Helps Us Understand Human Biology Matter All forms of matter are made up of atoms Atoms- units of matter that cannot be broken down into simpler substances by an ordinary chemical means Atoms Composed of subatomic particles Particle Charge Mass Location Proton +1 1 Nucleus Neutron 1 Nucleus Electron-1 Electron cloud Elements Element An element is a form of matter containing only one kind of atom. Essential Elements Elements Atoms of the different elements differ in their number of subatomic particles Atomic Number Number of Protons in the nucleus Protons and Electrons always = Number of Neutrons may vary Isotopes...
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Lecture 1 - Humans in the World of Biology Biology Life...

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