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5 Written questions

5 Matching questions

  1. protein
  2. buffer
  3. compound
  4. acid
  5. base
  1. a pure substance with unique properties; formed when two or more different elements combine.
  2. b organic compound made of amino acids joined by peptide bonds; primary building block of organisms.
  3. c substance that releases hydroxide ions (OH-) when dissolved in water; a basic solution has a pH greater than 7.
  4. d mixture that can react with an acid or a base to maintain the pH within a specific range.
  5. e substance that releases hydrogen ions (H+) when dissolved in water; an acidic solution has a pH less than 7.

5 Multiple choice questions

  1. substance in which another substance is dissolved.
  2. compound whose atoms are held together by covalent bonds
  3. pure substance composed of only one type of atom; cannot be broken down into another substance by physical or chemical means
  4. large molecule formed by joining smaller organic molecules together
  5. large molecule formed from smaller repeating units or identical, or nearly identical, compounds linked by covalent bonds.

5 True/False questions

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

          

  2. polar moleculelarge molecule formed by joining smaller organic molecules together

          

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

          

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

          

  5. solutionhomogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent).