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IB Biology HL D1.1.6 Hl Dna Polymerase Directionality Questions

Explore 3-prime-end nucleotide addition, phosphodiester linkage and antiparallel-strand synthesis in IB Biology HL D1.1.6.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that DNA polymerase adds each nucleotide to the 3' end of a growing strand, so new DNA is synthesized 5' to 3'.
  • Identify the phosphodiester linkage between the phosphate of a free nucleotide and the deoxyribose of the growing DNA strand.

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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