Biochemistry Examination Practice Questions and Answers, Exams of Biochemistry

Download Biochemistry Examination Practice Questions and Answers and more Exams Biochemistry in PDF only on Docsity! Biochemistry examination practice questions and the most correct answers  Matter - Correct Answer Anything that has mass and/or takes up space (volume)  Element - Correct Answer A substance that cannot be broken down into other substances by chemical reactions  Molecule - Correct Answer Any combination of atoms  Compound - Correct Answer Two or more different elements combined in a fixed ratio  Atom - Correct Answer Smallest unit of matter that retains the properties of an element  Atomic Number - Correct Answer Number of protons  Mass Number - Correct Answer Number of protons plus neutrons  Atomic Weight - Correct Answer 1 mole of a substance = atomic weight in grams  Isotope - Correct Answer Atom with an abnormal number of neutrons  Proton - Correct Answer Positively charged subatomic particle  Neutron - Correct Answer Subatomic particle with no charge  Electron - Correct Answer Negatively charged subatomic particle  Valence Electron - Correct Answer Outermost electrons in an atom  Covalent Bond - Correct Answer Sharing of electrons (Two non-metals)  Ionic Bond - Correct Answer Electrostatic attraction of positive and negative ions (Metal and Non-metal)  Valence shell - Correct Answer An atom's outermost electron shell  Polar Covalent Bond - Correct Answer Unequal sharing of electrons due to difference in electronegativity  Cation - Correct Answer Positively charged ion  Anion - Correct Answer Negatively charged ion  Hydrogen bond - Correct Answer Hydrogen atom covalently bonded to an electronegative atoms is attracted to another electronegative atom  Reactants - Correct Answer Starting materials in a reaction  Products - Correct Answer Ending materials in a reaction  Cohesion - Correct Answer Two or more molecules of the same substance held together by hydrogen bonds  Adhesion - Correct Answer Two or more molecules of different substances held together by hydrogen bonds  Surface tension - Correct Answer Measure of how difficult it is to stretch/break the surface of a liquid  Specific heat - Correct Answer Amount of heat absorbed to change the temperature by 1 degree C for 1 g of a substance  Heat of vaporization - Correct Answer Quantity of heat required to turn liquid to gas  Evaporative cooling - Correct Answer As liquid evaporates surface cools since molecules left behind have less kinetic energy  Solute - Correct Answer The substance that dissolves  Solvent - Correct Answer The dissolving agent in a solution  Hydrophobic - Correct Answer Water fearing (will NOT mix with water)  Hydrophilic - Correct Answer Water fearing (mixes with water)  Temperature - Correct Answer Measure of heat energy as average kinetic energy