Observing The Cell Cycle Biology Worksheet Page 25
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29Investigation 12A
The DNA Molecule
8. Once you have created the complimentary DNA strand, use the clear plastic
connectors to “bond” the base pairs together. These connectors represent the weak
bonds that keep the base pairs together.
9. Draw a sketch of your DNA molecule in Table 3.
10. Hold the model from the top, and gently twist the DNA ladder to the right. You
should see that the DNA looks like a spiral staircase. The model now represents the
helical structure of DNA. Your teacher may instruct you to take your model and
attach all the DNA models together to make a longer strand of DNA. Do not do this
until instructed by your teacher.
.
Table 3: DNA molecule sketch
C
Thinking about what you observed
a. Which molecules make up the backbone of the DNA molecule?
b. Why is DNA called “deoxyribonucleic acid”?
What type of bond keeps the bases paired together?
c.
d. Which base always pairs with adenine? Which base always pairs with cytosine?
3
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