Gizzmo Dna Essay

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Gizmo Warm-up The Building DNA Gizmo™ allows you to construct a DNA molecule and go through the process of DNA replication. Examine the components that make up a DNA molecule. 1. What are the two DNA components shown in the Gizmo? The DNA components shown in the Gizmo are phosphate molecules and deoxyribose sugars 2. A nucleoside has two parts: a pentagonal sugar (deoxyribose) and a nitrogenous base (in color). When a nucleoside is joined to a phosphate, it is called a nucleotide. How many different nitrogenous bases do you see? 4 Note: The names of these nitrogenous bases are adenine (red), cytosine (yellow), guanine (blue), and thymine (green). Activity A: Build a DNA molecule Get the Gizmo ready: • If necessary, click Reset to start the building process. Question: What is the structure of DNA? 1. Build: Follow the steps given in the Gizmo to construct a molecule of DNA. (Note: For simplicity, this DNA molecule is shown in two dimensions, without the twist.) Stop when the hint reads: “The DNA molecule is complete.” In the spaces at right, list the sequence of nitrogenous bases on the left-hand side of the DNA molecule and the right-hand side. 2. Take a picture: Click the camera ( ) at upper right to take a snapshot of your DNA molecule. Open a blank word-processing document, and select paste. Label this image “Original DNA molecule.” Left side Right side _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ 3. Explain: Describe the structure of the DNA molecule you made. A. What makes up the sides of the DNA molecule? ____________________________ B. What makes up the “rungs” of the DNA molecule?

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