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Ch. 2
Water, Biochemistry, and cells
Question | Answer |
---|---|
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 |