Biology

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Across
  1. 2. A group of similar organisms that can breed and produce fertile offspring
  2. 4. Attraction between molecules of the same substance
  3. 8. A molecule that is a constituent of the inner bilayer of biological membranes, having a polar, hydrophilic head and a nonpolar, hydrophobic tail
  4. 12. A double sugar, consisting of two monosaccharides joined by dehydration synthesis.
  5. 14. Energy needed to get a reaction started
  6. 15. Water fearing
  7. 17. A subatomic particle that has no charge and that is found in the nucleus of an atom
  8. 19. lipid molecule with four fused carbon rings
  9. 20. A type of protein that speeds up a chemical reaction in a living thing
Down
  1. 1. A chemical substance that is present at the start of a chemical reaction
  2. 3. Carbohydrates that are made up of more than two monosaccharides
  3. 5. A group of ecosystems that share similar climates and typical organisms
  4. 6. the energy required to break a chemical bond and form neutral isolated atoms
  5. 7. The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree celcius
  6. 9. A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level
  7. 10. An attraction between molecules of different substances
  8. 11. Formed when one or more electrons are transferred from one atom to another
  9. 13. A fat that is solid at room temperature and found in animal fats, lards, and dairy products
  10. 16. describes a molecule in which the positive and negative charges are separated
  11. 18. A liquid substance capable of dissolving other substances