Rungs
Rungs
� adenine
thymine
adenine
thymine
�
�
�
�
�
�
�
�
�
�
© CSIRO’s Double Helix Science Club
�
© CSIRO’s Double Helix Science Club
�
�
�
�
�
�
�
�
�
�
�
�
�
� guanine
�
�
�
�
��
��
��
��
� guanine
cytosine
© CSIRO’s Double Helix Science Club
cytosine
�
© CSIRO’s Double Helix Science Club
��
��
��
��
��
��
��
��
��
��
��
��
A DNA molecule from
CSIRO’s
A DNA molecule from
CSIRO’s
http://www.csiro.au/helix
http://www.csiro.au/helix
© CSIRO’s Double Helix Science Club
© CSIRO’s Double Helix Science Club
P
P
P
P
P
P
P
P
P
P
P
13
12
10
8
7
6
5
4
P
2
S
S
9
S
S
3
1
© CSIRO’s Double Helix Science Club
S
11
P
S
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
P
P
P
P
P
© CSIRO’s Double Helix Science Club
14
13
12
10
8
7
6
5
4
P
2
S
S
9
S
S
3
1
© CSIRO’s Double Helix Science Club
P
© CSIRO’s Double Helix Science Club
P
14
Spine A
Spine B
Spine A
S
S
11
S
S
S
S
S
S
S
S
Spine B
S
P
S
P
1
1
S
P
S
P
2
2
S
P
S
P
3
3
S
P
S
P
4
4
S
P
S
P
S
P
S
S
5
5
7
P
7
P
S
P
S
P
S
P
S
P
8
8
6
6
9
9
S
P
S
P
S
P
S
10
10
S
P
11
P
S
S
P
11
12
P
12
13
13
S
P
S
P
S
P
S
P
14
14
1. Color the spines four different colors, one for each chemical “rung” – adenine,
cytosine, guanine, and thymine.
2. Cut out spines A and B.
3. Cut out the rungs.
4. Fold down the tabs so that they are at right angles to the rungs (as shown in the
picture).
5. Put glue on one tab of each rung and stick them onto spine A in the numbered boxes.
You can attach the rungs in any order (pointing either way). Wait for the glue to set
before proceeding. You may also want to hold the rung on with a paper clip.
6. Once the glue is dry, put glue on the other tab of each rung and stick them to the
corresponding numbered position on spine B. This is the tricky part because you'll have
to support both spines while the glue is drying. Once again, this is where paper clips will
be a BIG help.