Biology 219 Exam 1 with Questions and Answers

Biology 219 Exam 1 with Questions and Answers Why do bonds form? ANSWER To increase stability (lowers energy) What is an ionic bond? ANSWER The complete transfer of valence electrons between atoms (between a metal and a nonmetal) What is a hydrogen bond? ANSWER A hydrogen atom and an electronegative atom (these bind water molecules to other water molecules) What is a covalent bond? ANSWER The metal sharing of one or more pairs of electrons between 2 atoms Which type of bond is most important in a cellular environment? ANSWER Covalent What is the difference between polar and non polar covalent bonds? ANSWER With non polar the electrons are shared equally, with polar the electrons are not shared equally Define Dispersion ANSWER When non polar things are dispersed by polar things, the non polar things group together to avoid the polar things (Think teacher in cafeteria analogy) What is the number one contributor to protein folding? ANSWER Dispersion Describe the functional group: phosphate ANSWER One phosphate and four oxygens