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IB Biology SL A4.1.2 Evidence From Sequences Questions

Use DNA, RNA and protein sequence evidence to infer common ancestry, phylogeny and divergence.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Use DNA, RNA, amino-acid or protein sequences to infer common ancestry and evolutionary relatedness.
  • Interpret sequence identity and differences as molecular evidence for phylogeny, divergence or an evolutionary clock.

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Study A4.1.2—Evidence from sequences conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL A4.1.2 Evidence From Sequences Questions question 1

[Maximum number: 1]

What is a piece of evidence that all living organisms share a common ancestor?

A

They manufacture the same proteins.

B

They obtain energy from glucose.

C

DNA triplets code for the same amino acids.

D

Cells can synthesise all the amino acids.

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