Biology Crossword

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Across
  1. 2. upper chamber of the heart
  2. 6. the sides of the DNA helix are made up of sugars and ____________.
  3. 8. a whip-like tail on a bacterium for movement
  4. 9. the myelin sheath covers this part of the neuron
  5. 10. rod shaped bacteria
  6. 12. pumping chamber of the heart
  7. 13. RNA contains this base but DNA does not
  8. 14. a nonliving particle that invades cells and causes disease
  9. 15. space between neurons where neurotransmitter chemicals are found
Down
  1. 1. part of the neuron that receives the signals
  2. 3. tiny blood vessel through which oxygen and nutrients can pass
  3. 4. made of a sugar, phosphate, and a nitrogenous base
  4. 5. made in your mouth; part of the first line of defense in the immune system
  5. 7. the amount of cytosine in DNA equals the amount of __________.
  6. 10. made by the liver to help break down fats
  7. 11. DNA contains the code for making these molecules
  8. 12. injection of pieces of a virus to prevent you from getting the disease