Critical Thinking

7. Making Predictions If 2.2 picograms of DNA could be extracted from a certain number of human muscle cells, about how many picograms of DNA could be extracted from the same number of human gamete cells?

8. Applying Information Use the base-pairing rules to determine the base sequence that is complementary to the sequence C-G-A-T-T-G.

9. Making Calculations A plant's DNA has nucleotides that are 20 percent thymine. What percentage of guanine would be present?

objectives

• Summarize the process of DNA replication.

• Identify the role of enzymes in the replication of DNA.

• Describe how complementary base pairing guides DNA replication.

• Compare the number of replication forks in prokaryotic and eukaryotic cells during DNA replication.

• Describe how errors are corrected during DNA replication.

vocabulary

DNA replication helicase replication fork

DNA polymerase semi-conservative replication mutation

DNA Replication

Watson and Crick's discovery of the double helix structure of DNA caused great excitement in the scientific community. Scientists realized that this model could explain simply and elegantly how DNA can replicate exactly each time a cell divides, a key feature of hereditary material.

figure 10-9

Before a cell divides, its DNA is copied in a process called DNA replication. One copy of each chromosome moves to each new cell. In the photo above, the chromosomes (seen as the blue rods on each side of the cell) were in the process of moving during cell division.

figure 10-9

Before a cell divides, its DNA is copied in a process called DNA replication. One copy of each chromosome moves to each new cell. In the photo above, the chromosomes (seen as the blue rods on each side of the cell) were in the process of moving during cell division.

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