PARTB:DNA Replication
5.Discuss with your lab group how the
model you built for Part A may be used to
illustrate the process of replication.
6.Write a question you would like to explore
about replication. Use your model to
explore the question you wrote. Sketch
and label the steps of replication.PARTC:Test Hypothesis
Answer each of the following questions by
writing a hypothesis. Use your model to test
each hypothesis, and describe your results.
7.Mitosis follows replication. How might
the cells produced by mitosis be affected
if nucleotides on one DNA strand were
incorrectly paired during replication?
8.What would happen if only one strand in
a DNA molecule were copied during
replication?PARTD:Cleanup and Disposal
- Dispose of damaged pushpins in the
designated waste container. - Clean up your work area and all lab
equipment. Return lab equipment to
its proper place. Wash your hands thor-
oughly before you leave the lab and after
you finish all work.
Analyze and Conclude
- Analyzing ResultsIn your original DNA
model, were the two strands identical to
each other? - Relating Concepts How does DNA
structure ensure that the two DNA mole-
cules made by replication are the same as
the original DNA molecule? - Drawing Conclusions Did the two DNA
molecules you made in step 6 have the
same nitrogen-base sequence as your origi-
nal model DNA molecule? - Inferring RelationshipsThe order of
nitrogen bases on a DNA strand is a code
for making proteins. What does this mean
has happened to the “code” in one of the
DNA molecules you made in step 7? - Predicting OutcomesWhat would hap-
pen if the DNA in a cell that is about to
divide were not replicated? - Inferring InformationWhat are the
advantages of having DNA remain in the
nucleus of a cell? - Further InquiryWrite a new question
about DNA that could be explored with
your model.
CHAPTER 9DNA: The Genetic Material 205
http://www.scilinks.org
Topic:DNA
Keyword:HX4058Do You Know?
Do research in the library or media center
to answer these questions:
1.Are there any pollutants in the environ-
ment that disrupt replication when an
organism is exposed to the pollutant?
2.How do DNA molecules differ among
various species of animals and plants?
How are they similar?
Use the following Internet resources to
explore your own questions about DNA.