Cell Theory - Discuss the theory that living organisms are composed of cells.

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IB Biology Syllabus

Unit 1

1.1 Cell Theory (3h)

1.1.1 Discuss the theory that living organisms are composed of cells.

1.1.2 State that a virus is a non-cellular structure consisting of DNA and RNA surrounded by a protein coat.

A virus is a non-cellular structure consisting of DNA and RNA surrounded by a protein coat

1.1.3 State that all cells are formed from other cells.

All cells are formed from other cells

1.1.4 Explain three advantages of using light microscopes.

* Colors of material from specimen can be seen

* Living material can be studied and larger field of view

* Cell activities and movement can be studied

1.1.5 Outline the advantages of using electron microscopes.

Electron microscope

* Greater resolution so smaller structures can be seen

* gives interior/3-D view

1.1.6 Define organelle

Organelle - a small body with a specialized structure within a cell for a specific function

1.1.7 Compare relative sizes of molecules, cell membrane thickness, viruses, bacteria, organelles and cells, using appropriate SI units.

Size comparison:

* molecules - 1 nm

* macromolecules - 100