IB Biology HL D1.1.8 Hl Functions in Replication Questions

Explore primer synthesis, polymerase extension or replacement and ligase joining of Okazaki fragments in IB Biology HL D1.1.8.

Exam points

Explain how primase adds an RNA primer, DNA polymerase III extends new DNA, and DNA polymerase I replaces RNA primers with DNA.
Explain how DNA ligase joins Okazaki fragments.

[Maximum number: 2]

(a)

Explain the role of the following enzymes in DNA replication.

[ 2 ]

(i)

Explain the role of DNA polymerase III in DNA replication.

[ 1 ]

connects/forms (covalent) bonds between nucleotides in a $5^{\prime}$ to $3^{\prime}$ direction (OWTTE) / polymerizes nucleotides

(ii)

Explain the role of RNA primase in DNA replication.

[ 1 ]

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