Biology 116 Mini Exam 1 - Miami University questions with correct answers

Atoms Answer the basic units of matter; made of protons (+), neutrons (0), and electrons (-) Isotopes Answer same atoms but different number of neutrons and therefore have a different mass Elements Answer substance made up of one type of atom 95% of Elements Making Up Living Matter Answer carbon (C), hydrogen (H), oxygen (O), and nitrogen (N) 0.5% of Elements Making Up Living Matter Answer phosphorous (P) and sulfur (S) Molecules Answer bonding of different elements; results in different properties than those of the individual elements Covalent Bonds Answer strongest bond type; formed by the sharing of electrons; does not dissolve in water; polar and non-polar; energy needed to break (ex. water) Ionic Bonds Answer formed by the gain or loss of electrons; form ions: cation (+) and anion (-); dissolves in water; used in DNA; charged atoms are attracted to each other (ex. salt) Hydrogen Bonds Answer weak, but