BIO 2000- Midterm Exam Guide - Comprehensive Notes for the exam ( 24 pages long!)
6 Oct 2017
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Chapter 2: matter: anything that takes up space. Magnesium & sulfur: trace elements are about 0. 01% of human body weight, boron, chromium, cobalt, copper, fluorine, iodine, iron, manganese, Molybdenum, selenium, silicon, tin, vanadium & zinc: trace elements are those required by an organism in minute quantities, nitrogen deficiency, taller plants have nitrogen rich soil & shorter plants have nitrogen poor soil. Iodine deficiency causes goiters, which is enlargement of the thyroid gland. Isotopes: are 2 atoms of the same element that differ in the number of neutrons. Of protons: radioactive isotopes decay spontaneously, giving off particles and energy, some applications of radioactive isotopes in biological research are, dating fossils: used to find the age of living things, carbon-14 decays relatively quickly. It has a half-life of 5,730 years: uranium-238 decays slowly. As the element in the newly made dna decays, it emits radiation that excites chemicals causing them to give off light.
