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IB Biology SL D Continuity and Change Questions

Practise IB Biology SL D Continuity and Change through questions on genes, inheritance, evolution and biodiversity change.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain DNA replication, protein synthesis, mutation and gene editing using sequence and molecular evidence.
  • Apply cell-division, reproduction, inheritance and water-potential principles to diagrams, pedigrees and experimental data.
  • Explain homeostasis and natural selection through feedback, variation, competition and reproductive success.
  • Analyse ecosystem stability and climate change using feedbacks, trophic data, biodiversity and environmental evidence.

Covered syllabus points

D1.1 DNA replicationD1.2 Protein synthesisD1.3 Mutation and gene editingD2.1 Cell and nuclear divisionD2.3 Water potentialD3.1 ReproductionD3.2 InheritanceD3.3 HomeostasisD4.1 Natural selectionD4.2 Stability and changeD4.3 Climate change

Learn this topic

Study D Continuity and Change conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]

What is required to replicate DNA?

A

Temperature of 37∘C37^{\circ} \mathrm{C}

B

Free nucleotides carrying A, C, G and T bases

C

Plasmids

D

Endonuclease

Question 2

[Maximum number: 8]

Mitosis produces genetically identical cells, which become specialized by expressing specific genes. This ensures that tissues and organs are adapted to their functions.

Question (a)

(a)

Outline how the behaviour of chromosomes during mitosis ensures the production of genetically identical cells.

[ 4 ]

Question (b)

(b)

Describe how mRNA is produced in the nucleus.

[ 4 ]

Question 3

[Maximum number: 2]

Psammonobiotus balticus belongs to a group of protists (unicellular eukaryotic organisms) that have a shell surrounding most of the cell, which provides shelter from predators. The graph shows the frequency of varying shell lengths in a population of P. balticus.

Figure for Question 3 — IB Biology SL

Mutations may increase variation within a species. Compare and contrast substitution and insertion mutations.

Question 4

[Maximum number: 1]

Which process contributes to growth of a multicellular body?

A

Exocytosis

B

Meiosis

C

Mitosis

D

Osmosis

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