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IB Biology HL D1.1.6 Hl Dna Polymerase Directionality Questions

In IB Biology HL D1.1.6, review how DNA strand ends determine the direction of DNA polymerase: new nucleotides are added to the 3′ end, building DNA 5′ to 3′.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify the 5′ and 3′ ends of DNA strands and state that DNA polymerase extends a new strand from its 3′ end, synthesizing DNA 5′ to 3′.

IB Biology HL D1.1.6 Hl Dna Polymerase Directionality Questions question 1

[Maximum number: 1]

How does DNA replicate?

A

The deoxyribose of a free nucleotide is linked to the phosphate of the last nucleotide in the chain.

B

The phosphate of a free nucleotide is linked to the deoxyribose of the last nucleotide in the chain.

C

Nucleotides are linked in a 3′3^{\prime} to 5′5^{\prime} direction and the new strands are anti-parallel to the template strands.

D

Nucleotides are linked in a 5′5^{\prime} to 3′3^{\prime} direction and the new strands are parallel to the template strands.

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