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In complex multicellular organisms, eukaryotic cells become specialised for specific functions.

Specialised cells are organised into tissues, tissues into organs and organs into systems. Structure of prokaryotic cells and of viruses Students should be able to apply their knowledge of these features in explaining adaptations of eukaryotic cells. No nucleus instead they have a single circular DNA molecule that is free in the cytoplasm and is not associated with proteins.cytoplasm that lacks membrane-bound organelles.They also differ from eukaryotic cells in having: Prokaryotic cells are much smaller than eukaryotic cells. a cell wall that contains murein, a glycoprotein. In addition, many prokaryotic cells have:ĭetails of these structural differences are not required. The structure of virus particles to include genetic material, capsid and attachment protein.

The principles and limitations of optical microscopes, transmission electron microscopes and scanning electron microscopes. Measuring the size of an object viewed with an optical microscope. Principles of cell fractionation and ultracentrifugation as used to separate cell components. Students should be able to appreciate that there was aĬonsiderable period of time during which the scientific communityĭistinguished between artefacts and cell organelles. Iodide solution to identify starch grains in plant cells. Within multicellular organisms, not all cells retain the ability to divide.Įukaryotic cells that do retain the ability to divide show a cell cycle.DNA replication occurs during the interphase of the cell cycle.

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