Across
- 2. substance that speeds up the rate of a chemical reaction
- 3. the average mass of an atom of an element, usually expressed in atomic mass units; also referred to as mass number
- 6. small chemical unit that makes up a polymer
- 8. electrons that can be actively involved in chemical change; outer shell electrons
- 12. reactant of an enzyme-catalyzed reaction
- 14. macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorus
- 15. the breaking down in living organisms of more complex substances into simpler ones, with the release of energy
- 16. type of bond between atoms in which the electrons are shared
- 18. compound made up of carbon, hydrogen, and oxygen atoms; type of nutrient that is the major source of energy for the body
- 20. the center of an atom, which contains the protons and neutrons
- 22. smallest unit of most compounds that displays all the properties of that compound
- 24. compound with an amino group on one end and a carboxyl group on the other end
- 26. elements or compounds produced by a chemical reaction
- 27. substance formed by the chemical combination of two or more elements in definite proportions
- 29. the basic unit of matter
- 33. an arrangement of the elements in order of atomic number with similar elements falling into columns
- 35. negatively charged particle; located in the space surrounding the nucleus
- 36. covalent bond formed between two amino acids
- 37. the synthesis in living organisms of more complex substances from simpler ones
- 38. a carbohydrate whose molecules consist of a number of sugar molecules bonded together
- 39. simple sugar molecule
Down
- 1. macromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair
- 2. process that changes, or transforms, one set of chemicals into another set of chemicals
- 4. a compound that contains hydrocarbons, often associated with living things
- 5. atom that has a positive or negative charge
- 7. the combination of many small molecules to form large molecules
- 9. protein catalyst that speeds up the rate of specific biological reactions
- 10. subunit of which nucleic acids are composed; made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base
- 11. a link between atoms
- 13. slight attraction that develops between oppositely charged regions of nearby molecules
- 17. pure substance that consists entirely of one type of atom
- 19. any substance that is composed of two molecules of simple sugars linked to each other
- 21. hydrocarbons that contain only single bonds
- 23. hydrocarbons that contain double or triple carbon-carbon bonds
- 25. chemical bond formed when one or more electrons are transferred from one atom to another
- 28. molecules composed of many monomers; makes up macromolecules
- 30. elements or compounds that enter into a chemical reaction
- 31. macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes
- 32. energy that is needed to get a reaction started
- 34. the number of protons in an atomic nucleus