Observing The Cell Cycle Biology Worksheet Page 28
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293. Begin by creating the phosphate and sugar backbone of the DNA molecule.
Determine the number of bases and indicate this number in Table 2.
4. Recall that the bases attach to the sugar molecules. Calculate the number of sugar
molecules that will be needed and record this in Table 2. Since the backbone is
alternating phosphate and sugar molecules, calculate the number of phosphate
molecules that will be needed. Record this in Table 2.
5. Using your calculations recorded in Table 2, create two phosphate-sugar backbones
that provide the framework to build your DNA model.
6. Using the base sequence provided by your teacher, create your DNA model. Table 1
contains the base color coding for the pop beads that will be used in creating your
sample of DNA.
7. Once you have created your DNA sample, wait for instructions from your teacher.
8. Once everyone in the class is done creating their DNA models, compare your DNA
model with those of your classmates. Once a match is found, each group should open
their envelopes to determine the source of the DNA sample.
B
Thinking about what you observed
a. Who was the person that took a bite from the apple on your teacher’s desk?
b. Why is it important to correctly construct the DNA model of the different samples?
How could mistakes in the construction of the original models lead to a mistake in the
c.
identity of the suspect?
2
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