BIO 116 Exam Review questions with correct answers

Which of the following lists some of the levels of biological organization from less complex to more complex? Answer atoms, molecules, cells, organs What are isotopes? Answer two atoms of an element that have same number of protons but different numbers of neutrons What are valence electrons and why are they important? Answer Valence electrons are the electrons in the outermost orbital of an atom that can participate in bonding What are covalent bonds? Answer electrons shared between atoms What are ionic bonds? Answer electrons transferred between oppositely charged atoms What are hydrogen bonds? Answer hydrogen atom covalently bonded to a very electronegative atom is attracted to another electronegative atom Van der Waals interactions Answer attractions between partial positive and partial negative charges in close together molecules due to dispersion forces Rank hydrogen bonds, ionic bonds, Van der waals interactions, and covalent bonds from strongest to weakest within a cell Answer covalent bonds > ionic bonds > hydrogen bonds > van der waals interactions