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5 Written questions

5 Matching questions

  1. valence shell
  2. ribonucleic acid(RNA)
  3. Hydrogen Bond
  4. Isotopes
  5. Atom
  1. a the nucleic acids that contains ribose acts in protein synthesis. Present in all living cells. Principal role is to aid as a messenger carrying instructions from DNA for controlling the synthesis of proteins.
  2. b An atoms outermost electron shell.
  3. c Extremely weak bonds formed when a hydrogen atom binds to one electron hungry nitrogen or oxygen atom is attracted to another electron hungry atom and a bridge if formed between them.
  4. d The building blocks of elements.
  5. e Atoms with the same number of protons and electrons but vary in the number of neutrons they contain.

5 Multiple choice questions

  1. Anything that has mass and takes up space.
  2. Atomic particles with a positive charge.
  3. Carbon containing compounds.
  4. Heavier isotopes of certain atoms are unstable and tend to decompose to become more stable.
  5. nucleic acid found in all living cells:carries the organism's hereditary information.

5 True/False questions

  1. Atomic MassThe sum of the masses of all the protons and neutrons contained in an atoms nucleus.


  2. Amino AcidsA substance that can release hydrogen ions (H+) in detectable amounts. having a sour taste and can dissolve many metals of burn a hole in your rug. pH below 7


  3. Enzyme(catalyst)Substances that conduct an electrical current in solutions.


  4. Electron ShellsOrbits or fixed regions of space around the nucleus that electrons occupy.


  5. BasesHydroxides ionize and dissociate in water releasing hydroxyl ions (OH-)