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 ( ) to take a
snapshot of your DNA molecule. Right-click the
image and select Copy Image. Paste the image
into a blank document, and label this image
“Original DNA molecule.”

Left side Right side