Building dna

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DNA GIZMO
DNA GIZMO, DNA GIZMO

Question: What is the structure of DNA
You are building left side 1 st

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?

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.) You are building left side 1^st.

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.

Left side Right side

_____g________ _______c______

_____________ ______t_______

___c__________ ______g_______
_____t________ _______a______
_____g________ _______c______
___a__________ ______t_______
____c_________ _____g________
___t__________ _________a____

Explain: Describe the structure of the DNA molecule you made.

What makes up the sides of the DNA molecule? ____________________phosphates________

What makes up the “rungs” of the DNA molecule? ________nucleosides___________________

Fill in: Write the name of the nitrogenous base that joins to each of the bases below:

Adenine, thymine thymine adenie

Adenine (A) joins to ___________thymine____ Thymine (T) joins to ____adenine___________

Cytosine (C) joins to ____guanine___________ Guanine (G) joins to _______cytosine ________

P ractice: The left side of a DNA molecule is shown. Draw a complementary right side of the molecule.

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