Materials:

• Empty 2-liter soda bottle
• Scissors
• Tape
• Red, yellow, green, and blue paint
• Paintbrushes

Instructions:

1. Cut the bottom off of the soda bottle.
2. Cut the sides of the bottle into strips, about 1 inch wide.
3. Tape the strips together to form a double helix shape.
4. Paint the strips to represent the different nitrogenous bases. Red for adenine, yellow for thymine, green for cytosine, and blue for guanine.

Materials:

• Candy (such as gummy bears, Skittles, or M&Ms)
• Toothpicks

Instructions:

1. Use the toothpicks to connect the candy pieces together to form the double helix shape of DNA.
2. Use different colored candy to represent the different nitrogenous bases. For example, you could use red candy for adenine, yellow candy for thymine, green candy for cytosine, and blue candy for guanine.

Materials:

• Lego bricks

Instructions:

1. Use the Lego bricks to build a model of the double helix shape of DNA.
2. Use different colored Lego bricks to represent the different nitrogenous bases. For example, you could use red bricks for adenine, yellow bricks for thymine, green bricks for cytosine, and blue bricks for guanine.

Materials:

• Paper plates
• Scissors
• Glue
• Markers

Instructions:

1. Cut two paper plates in half.
2. Glue the two halves of the paper plates together to form a circle.
3. Cut out a spiral shape from the center of the circle.
4. Color the spiral to represent the different nitrogenous bases. Red for adenine, yellow for thymine, green for cytosine, and blue for guanine.

Materials:

• Pool noodles
• Scissors
• Tape

Instructions:

1. Cut the pool noodles into strips, about 1 inch wide.
2. Tape the strips together to form a double helix shape.
3. Use different colored pool noodles to represent the different nitrogenous bases. For example, you could use red pool noodles for adenine, yellow pool noodles for thymine, green pool noodles for cytosine, and blue pool noodles for guanine.

• Collect empty soda cans and remove the tops and bottoms.
• Cut the cans lengthwise and flatten them.
• Use markers or paint to draw the nitrogenous bases (A, T, C, G) on the strips of aluminum.
• Assemble the DNA strands by connecting the strips together with tape or glue.

• Collect empty plastic bottles and cut them in half.
• Use scissors or a craft knife to cut out the shape of a DNA double helix from the plastic.
• Attach the two halves of the DNA helix together with tape or glue.
• Use markers or paint to label the nitrogenous bases on the DNA model.

• Collect pieces of cardboard and cut them into strips.
• Wrap the cardboard strips around a cylinder or dowel rod to form the shape of a DNA double helix.
• Secure the cardboard strips together with tape or glue.
• Use markers, paint, or construction paper to represent the nitrogenous bases on the DNA model.

• Collect scrap paper and tear it into small pieces.
• Mix the paper pieces with water and glue to create a paper mache paste.
• Shape the paper mache paste into the form of a DNA double helix.
• Allow the paper mache DNA model to dry and harden.
• Paint or decorate the DNA model to represent the nitrogenous bases.

• Collect bottle caps in different colors to represent the nitrogenous bases.
• Arrange the bottle caps in the sequence of a DNA double helix.
• Glue or tape the bottle caps together to form the DNA model.
• Create a key to identify the different nitrogenous bases.