Chapter 8: The Structure of DNA, RNA and Proteins

This chapter will explore the structure of nucleic acids and proteins.

DNA Structure

DNA is composed of several different subunits. The backbone of the molecule is made of a sugar called deoxyribose. The deoxyribose is held together by phosphate groups. Deoxyribose also forms bonds with the four bases, adenine (A), cytosine ( C), thymine (T) and guanine (G). Figures 8.1-8.6 depict how the subunits are assembled in a DNA molecule. In these figures, black represents adenine, white thymine, dark gray guanine, and light gray cytosine.

Figure 8.1: Rasmol Image of DNA Double Helix Segment

Figure 8.2: Closer View of DNA

Figure 8.3: Conceptual DNA Model

Figure 8.4: Top and Side view of Two Steps

Chapter 3 describes how this structure stores information. The order of the four bases (A, T, C and G) read three at a time per table 3.2 determine the amino acid sequence in the final protein.

next: RNA structure

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DNA, RNA and Protein
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