Biology Review 1

2. any change in copying the DNA message
8. form the rungs of a DNA molecule
12. the DNA that is formed when DNA from one organism is put into the DNA of another organism
13. a chemical that acts as a messenger for DNA
15. ______ twins are two children that form from the splitting of one fertilized egg
16. three pairs of small glands located under the tongue and behind the jaw
18. the changing of food into a usable form
19. a tube hat connects the mouth to the stomach
20. the adding of a healthy gene into the body of a person suffering from a disorder caused by a defective or mutated gene

1. energy that is given off by atoms
3. a liquid that is formed in the mouth and that contains an enzyme. (speeds up chemical change in carbohydrates)
4. A ______ turns food into a form the cells can use
5. ______ twins are twins that form from two different fertilized egg
6. the bringing together of two living things to produce offspring
7. A ______ occurs when large food pieces are broken down into smaller pieces
9. the code that translates the DNA language into the protein language
10. chemicals that speed up the rate of chemical change
11. a molecule that makes up genes and determines the traits of all living things
14. ______ system is a group of organs that take in food and change it into a form the body can use
17. a baglike, muscular organ that mixes and chemically changes protein