science 2

4. a large organic molecule made up of many atoms
6. a combination of 2 or more elements connected by bonds
7. subunit of which nucleic acids are composed; made up of a 5 carbon sugar, a phosphate group, and a nitrogenous base
12. reactant of an enzyme- catalyzed reaction
14. energy that is needed to get a reaction started
16. molecules composed of many monomers makes up macromolecules
17. negatively charged particle that orbits the nucleus in the electron cloud
18. substance that speeds up the rate of a chemical reaction
19. pure substance that consists entirely of one type of atom
21. basic unit of life
22. type of bond between atoms in which the electrons are shared
23. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table
25. substance formed as a chemical reaction
26. equal to the total number of protons and neutrons in the nucleus of an atom
27. a reaction that releases energy
28. small chemical unit that makes up a polymer
29. the center of an atom, which contains the protons and neutrons

1. a reaction that absorbs energy
2. compound made up of carbon, hydrogen, and oxygen atoms, type of nutrient that is the major source of energy for the body
3. macromolecule made up of amino acids
5. macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes
8. compound with an amino group on one end and a carboxyl group on the other end
9. elements or compounds that enter into a chemical reaction
10. electron found in the outermost shell of an atom; helps to determine bonding
11. particle found in the nucleus that has no charge
13. biological catalyst
15. process that changes, or transforms, one set of chemicals into another set of chemicals
20. one or two letter abbreviation for a chemical element name
24. macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorous
25. positively charged particle found in the nucleus of an atom