Unit 6 AP Biology Practice

Front

Which enzyme is responsible for joining the fragments on the lagging strand?

Back

Ligase is the enzyme that joins Okazaki fragments on the lagging strand during DNA replication.

Front

What does it mean that DNA replication follows a 'semi-conservative' model?

Back

In semi-conservative replication, each new DNA molecule consists of one parental strand and one newly synthesized daughter strand.

Front

What holds the two strands of DNA together?

Back

The two strands of DNA are held together by hydrogen bonds between complementary nitrogenous bases.

Front

Which enzyme requires RNA primers to initiate DNA synthesis?

Back

DNA polymerase requires RNA primers to start the synthesis of a new DNA strand.

Front

In what phase of the cell cycle does DNA replication take place?

Back

DNA replication occurs during the S phase of the cell cycle.

Front

What are Okazaki fragments?

Back

Okazaki fragments are short sequences of DNA synthesized on the lagging strand during DNA replication.

Front

What is the role of helicase in DNA replication?

Back

Helicase unwinds the double helix of DNA, separating the two strands to allow replication.

Front

What is the function of topoisomerase during DNA replication?

Back

Topoisomerase relieves the tension and prevents supercoiling ahead of the replication fork.

Front

What are the building blocks of DNA?

Back

The building blocks of DNA are nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.

Front

What is the difference between leading and lagging strands in DNA replication?

Back

The leading strand is synthesized continuously, while the lagging strand is synthesized in short segments called Okazaki fragments.