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Ch. 2

Water, Biochemistry, and cells

First property associated with living organisms 1)Common set of biological molecules *cell=basic unit of life (uni- or multi-cellular CELLS-TISSUES-ORGANS-ORGAN SYSTEMS-ORGANISM
Second property associated with living organisms 2) Growth=increase in size & number of cells *building outweighs breaking down process
Third property associated with living organisms 3) Movement
Fourth property associated with living organisms 4) Reproduction *Asexual=one parent cell--all offspring identical; ex: mitosis *Sexual=two parent cells--all offspring genetically different; ex: misosis
Fifth property associated with living organisms 5) Response to external stimuli (environmental); changes (stimuli)
Sixth property associated with living organisms 6) Metabolism-chemical reactions *anabolism: build up; synthesis of substances necessary for life *Catabolism: break down of substances to produce energy
Seventh property associated with living organisms 7) Maintain Homeostasis; balance=constant/maintaining
Eighth property associated with living organisms 8) Evolve-change of time
Define Elements Fundamental forms of matter; CHNOPS (6 elements) Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
Define Atoms Smallest unit of each element
Subatomic particles of an Atom, their charge & location *Atomic Nucleus (center of atom) -Protons=positive charge -Neutrons=negative charge *Electron cloud (outside) -Electrons: negative charge
Define Atomic Number number of Protons in neucleus
Ions Atoms w/ electrical charge; difference in # of protons & electrons; lost or gained electrons to achieve stability *Anion=negative *Cation=positive
Neutral Atom Has equal # of protons & electrons (P+E=N)
Molecules Two or more atoms held together by chemical bonds
Describe Hydrogen Bonds WEAK chemical bond that forms when partially positive hydrogen attracted to partially negative atom
Created by: monieluvfitness