DNA

<p>In the <em>DNA</em> leveled reader fundamental science concepts in chemistry are explained through easily understood text and colorful illustrations and photographs. Children will learn that DNA stands for deoxyribonucleic acid which is a polymer made of two long strands wrapped around each other in a double helix shape. A polymer is a long chain of atoms and molecules linked together. DNA is found inside the cells of living things and contains four bases: adenine thymine guanine and cytosine. These bases line up in pairs inside the double helix. The sequences of the bases makes a genetic code that is read by proteins and determines many of the characteristics of a living thing. Each person has a different genetic code making everyone unique.</p><p>A pronunciation guide of scientific terms is included. 24 pages. Reading Level 2-5. Interest Level 2-5. Lexile measure 480L. 395 words.</p>