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5 Written questions

5 Matching questions

  1. amino acid
  2. molecule
  3. ionic bond
  4. element
  5. reactant
  1. a substance that exists before a chemical reaction starts; located on the left side of the arrow in a chemical reaction.
  2. b carbon compound joined by peptide bonds; building block of proteins.
  3. c electrical attraction between two oppositely charged atoms or groups of atoms.
  4. d compound whose atoms are held together by covalent bonds
  5. e pure substance composed of only one type of atom; cannot be broken down into another substance by physical or chemical means

5 Multiple choice questions

  1. organic compound containing carbon, hydrogen, and oxygen in a ratio of on oxygen and two hydrogen atoms for each carbon atom.
  2. protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction
  3. building block of matter; contains subatomic particles—neutrons, protons, and electrons
  4. substance formed by a chemical reaction; located on the right side of the arrow in a chemical equation.
  5. mixture that can react with an acid or a base to maintain the pH within a specific range.

5 True/False questions

  1. nucleic acidcomplex macromolecule that stores and communicates genetic information.


  2. compoundpure substance with unique properties; formed when two or more different elements combine.


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


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


  5. nucleuscenter of an atom; contains neutrons and protons. In eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA


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