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5 Written questions

5 Matching questions

  1. enzyme
  2. pH
  3. polar molecule
  4. amino acid
  5. nucleic acid
  1. a protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction
  2. b complex macromolecule that stores and communicates genetic information.
  3. c measure of the concentration of hydrogen ions (H+) in a solution.
  4. d molecule with oppositely charged regions
  5. e carbon compound joined by peptide bonds; building block of proteins.

5 Multiple choice questions

  1. center of an atom; contains neutrons and protons. In eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA
  2. large molecule formed from smaller repeating units or identical, or nearly identical, compounds linked by covalent bonds.
  3. type of chemical bond formed when atoms share electrons.
  4. substance in which another substance is dissolved.
  5. particle without a charge in an atom's nucleus

5 True/False questions

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


  2. solutehomogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent).


  3. mixturecombination of two or more different substances in which each substance keeps its individual characteristics; can have a uniform composition (homogeneous) or have distinct areas of substances (heterogeneous).


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


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


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