Bio Chapter 2
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Organisms
________ & the environment is subject to the laws of physics and chemistry.
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Electrons
________ form negatively charged "cloud "around nucleus.
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Tracers
________ used to track atoms through the bodys metabolism.
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organic molecules
They make up 96 % of living matter (carbon + hydrogen= ________)
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Radioactive isotopes
________ decay spontaneously, giving off particles and energy.
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Chemical compounds
________ can be broken down by chemical reactions & are arranged in a fixed ratio.
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Isotopes
________: 2 atoms of the same element with different number of neutrons.
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Organisms
________ are made up of matter.
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==Chemical connection to biology
==
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==Elements of Life
==
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20-25% of 92 elements are required for life (oxygen, nitrogen
ammonia, carbon, hydrogen)
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TRACE ELEMENTS
Elements required in very little amounts/minute quantities (ex
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Neutron mass =
proton mass
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Isotopes
2 atoms of the same element with different number of neutrons
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