Biology

DNA Replication and Repair AP Biology Unit 6

By Darlene Seifert

Multiple Choice

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Which of the following statements best explains the mechanism for DNA replication?

• DNA replication is reductive, because half the total DNA present is copied.

• DNA replication is dispersive, because the two resulting DNA molecules are mixtures of parent and daughter DNA.

• DNA replication is semi-conservative, because each DNA strand serves as a template during replication.

• DNA replication is conservative, because one resulting molecule is identical to the original and the other consists of two new strands.

Multiple Choice

 

In DNA replication, DNA "unwinds" to form two template strands: the leading strand and the lagging strand.

Which of the following statements about these strands is true?

• The leading strand of DNA is synthesized continuously.

• Okazaki fragments are used to synthesize the leading strand of DNA.

• DNA polymerase can only synthesize DNA on the leading strand.

• The lagging strand can only be synthesized once the leading strand has been completed.

Multiple Choice

There are several enzymes involved in DNA replication.

Which of the following correctly pairs the DNA replication enzyme with its function?

• DNA polymerase I opens up the DNA at the replication fork.

• Helicase seals gaps between DNA fragments.

• DNA primase extends primers by adding nucleotides to the 3′ prime end.

• Topoisomerases work ahead of the replication fork to prevent supercoiling.

Multiple Choice

Which of the following separates DNA into single-strands?

• DNA polymerase

• DNA helicase

• DNA gyrase

• DNA ligase

Multiple Choice

Which of the following has 3' to 5' polymerase activity?

• DNA polymerase I

• DNA polymerase II

• none of these DNA polymerase III

Multiple Choice

Okazaki fragments appear on which strand of DNA during DNA replication?

• lagging

• leading

Multiple Choice

 

Where does DNA replication take place?

• cytoplasm

• nucleus

• ribosome

• Golgi body