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5 Written questions

5 Matching questions

  1. nucleic acid
  2. neutron
  3. isotope
  4. catalyst
  5. molecule
  1. a complex macromolecule that stores and communicates genetic information.
  2. b substance that speeds up a chemical reaction by reducing the activation energy.
  3. c compound whose atoms are held together by covalent bonds
  4. d two or more atoms of the same element having different numbers of neutrons.
  5. e particle without a charge in an atom's nucleus

5 Multiple choice questions

  1. organic compound made of amino acids joined by peptide bonds; primary building block of organisms.
  2. homogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent).
  3. energy-requiring process by which atoms or groups of atoms in substances are changed into different substances
  4. electrical attraction between two oppositely charged atoms or groups of atoms.
  5. carbon compound joined by peptide bonds; building block of proteins.

5 True/False questions

  1. protonpositively charged particle in an atom's nucleus.


  2. atombuilding block of matter; contains subatomic particles—neutrons, protons, and electrons


  3. enzymelarge molecule formed from smaller repeating units or identical, or nearly identical, compounds linked by covalent bonds.


  4. buffersubstance that releases hydroxide ions (OH-) when dissolved in water; a basic solution has a pH greater than 7.


  5. solventsubstance in which another substance is dissolved.


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