Structure of prokaryotic cells and of viruses (3.2.1.2) | AQA A-Level Biology - (7402) | KnowledgeSet

Structure of prokaryotic cells and of viruses

Biology · A-Level · AQA · AQA A-Level Biology - (7402) · Specification point · 3.2.1.2 · Cells · Cell structure

Next Steps

Read Notes

Read clear notes for this topic.

Exam Questions

Coming soon

Flashcards

Flip through flashcards to lock it in.

Lesson

Coming soon

Ask Sage

Get help from Sage on this topic.

3.2.1.2 Structure of prokaryotic cells and of viruses

Content	Opportunities for skills development
$Prokaryotic cells are much smaller than eukaryotic cells. They also differ from eukaryotic cells in having: cytoplasm that lacks membrane-bound organelles smaller ribosomes no nucleus; instead they have a single circular DNA molecule that is free in the cytoplasm and is not associated with proteins a cell wall that contains murein, a glycoprotein. In addition, many prokaryotic cells have: one or more plasmids a capsule surrounding the cell one or more flagella. Details of these structural differences are not required. Viruses are acellular and non-living. The structure of virus particles to include genetic material, capsid and attachment protein.$

Content

Opportunities for skills development

Prokaryotic cells are much smaller than eukaryotic cells. They also differ from eukaryotic cells in having: cytoplasm that lacks membrane-bound organelles smaller ribosomes no nucleus; instead they have a single circular DNA molecule that is free in the cytoplasm and is not associated with proteins a cell wall that contains murein, a glycoprotein. In addition, many prokaryotic cells have: one or more plasmids a capsule surrounding the cell one or more flagella. Details of these structural differences are not required. Viruses are acellular and non-living. The structure of virus particles to include genetic material, capsid and attachment protein.