IB Biology SL A4.1.2 Sequence evidence Question Bank
Practise IB Biology SL A4.1.2 by using conserved DNA, amino-acid and protein evidence to explain common ancestry and relatedness.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Use shared DNA triplets, conserved residues or protein sequences as evidence of common ancestry.
- Interpret sequence differences to compare relatedness between organisms or populations.
A4.1.2—Evidence from sequences 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.
C
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