bio 202 exam 1 study guide

bio 202 exam 1 study guide - 5 atoms elements and matter...

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5. atoms, elements, and matter The properties of elements that form organic matter depend on the properties of atoms. Molecular approach to studying biology: helps us understand the molecular basis of all aspects of biological diversity. I. four different atoms make up 96% of the matter in organisms a. hydrogen: 9.5 b. carbon: 18.5 c. nitrogen: 3.3 d. oxygen: 65 life requires ~25 elements, trace elements are elements required in minute amounts but their lack can cause severe disorders. a. iron b. iodine matter: anything that has mass and takes up space mass is a constant, versus weight which depends on gravity everything on earth is made up of matter (not-living as well). Matter consists of chemical elements in pure form and in combinations (molecules and compounds). A. elements and atoms Elements are a pure substance made up of one kind of atom. Cannot be broken down into simpler substances by chemical means, 118 elements, 92 natural B. Molecules and Compounds Are when atoms are combined in fixed numbers
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