BIO SCI 93 Lecture Notes - Lecture 2: Hydrogen Bond, Chemical Formula, Evaporation
9 Nov 2016
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BIO SCI 93 Full Course Notes
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Trace elements- required by an organism in minute quantities. Ie. (fe) (i- essential ingredient for hormone produced by thyroid gland, goiter or growing of thyroid gland can be caused by iodine deficiency) Dalton-unit of measurement equivalent to amu, neutrons and protons have masses close to 1 dalton. Electrons are ignored when computing the total mass of an atom. Isotope- different atomic forms of the same element. Have slightly different masses but can behave identically in chemical reactions. Radioactive isotope- nucleus decays spontaneously and gives off particles and energy, can change # of protons leading to a different atom. Radioactive isotopes are useful as tracers to track atoms during metabolism. Radioactive isotopes can diagnose kidney disorders by identifying the tracer molecules excreted in the urine from administered radioactive substances in blood: radiation from decaying isotopes can be hazardous by damaging cellular molecules. Half-life- time it takes for 50% of a parent isotope to decay.
