BIOL 1541L Lecture Notes - Lecture 3: Lactose Intolerance, Covalent Bond, Thyroid Nodule
2 Feb 2017
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Document Summary
Lactase: an enzyme that breaks down lactose: people who are lactose intolerant do not produce lactase into adulthood. Life"s molecular diversity is based on the properties of carbon: almost all the molecules a cell makes are composed of carbon bonded to. Other carbons and atoms of other elements: carbon based molecules are called organic compounds. Isotopes: isotope: are atoms of the same element with different numbers of neutrons, radioactive isotopes emit various types of energy as they decay. Uses of low level radiation: the messing area in thyroid scan indicates the presence of a tumor that does not take up the radioactive iodine. Uses of high level radiation: radiation kills bacteria and fungi, irradiated peaches spoil less quickly and can be kept for a longer length of time, physicians use radiation therapy to kill cancer cells. Ionic bonding: ions: form when electrons are transferred from one atom to another.
