Biology · Unity and diversity

A2.3 — Viruses

Biology · SL / HL · syllabus-mapped notes

1. A2.3.1

   Structural features common to viruses

   State the structural features shared by all viruses.

2. A2.3.2

   Diversity of structure in viruses

   Describe how viruses vary in structure, with examples.

3. A2.3.3

   Lytic cycle of a virus

   Describe the phases of the lytic cycle, using bacteriophage lambda.

4. A2.3.4

   Lysogenic cycle of a virus

   Describe the lysogenic cycle, using bacteriophage lambda.

5. A2.3.5

   Evidence for several origins of viruses from other organisms

   Explain why the diversity of viruses suggests several separate origins.

6. A2.3.6

   Rapid evolution in viruses

   Explain why some viruses evolve very rapidly, and what that means for treating the diseases they cause.