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5 Written questions

5 Matching questions

  1. acid
  2. active site
  3. molecule
  4. protein
  5. catalyst
  1. a compound whose atoms are held together by covalent bonds
  2. b substance that releases hydrogen ions (H+) when dissolved in water; an acidic solution has a pH less than 7.
  3. c specific place where a substrate binds on an enzyme.
  4. d organic compound made of amino acids joined by peptide bonds; primary building block of organisms.
  5. e substance that speeds up a chemical reaction by reducing the activation energy.

5 Multiple choice questions

  1. large molecule formed from smaller repeating units or identical, or nearly identical, compounds linked by covalent bonds.
  2. energy-requiring process by which atoms or groups of atoms in substances are changed into different substances
  3. center of an atom; contains neutrons and protons. In eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA
  4. large molecule formed by joining smaller organic molecules together
  5. positively charged particle in an atom's nucleus.

5 True/False questions

  1. reactantsubstance that exists before a chemical reaction starts; located on the left side of the arrow in a chemical reaction.


  2. isotopetwo or more atoms of the same element having different numbers of neutrons.


  3. neutronparticle without a charge in an atom's nucleus


  4. productsubstance formed by a chemical reaction; located on the right side of the arrow in a chemical equation.


  5. lipidhydrophobic biological molecule composed mostly or carbon and hydrogen; fats, oils, and waxes are lipids


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