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

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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 •...

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