Category:Cell

Cell Biology looks at cell structure, function and chemistry.

Osmosis

Osmosis is the diffusion of water through a partially permeable membrane. Osmosis is especially important in plant; where it is used to regulate the turgidity of cells. They become flaccid when loosing water and turgid when gaining. See Osmosis

Gas Exchange

Gas exchange depends on the surface area to volume ratio, this influences transport systems. Gas exchange occurs in fish with their gills - water is passed over the lamellae and oxygen is extracted from it. See Gas Exchange

Cell Transport

The cell membrane is a phospholipid bilayer with imbedded proteins. Substances can travel across the membrane by diffusion, osmosis or active transport; the proteins in the membrane are often responsible in these processes. See Cell Transport

Cell Structure

The eukaryotic cell consists of many different organelles, including the nucleus, mitochondrion, endoplasmic reticulum and golgi body. Endosymbiosis is a theory that explains the origins of organelles in eukarotic cells. See Cell Structure

Cell Cycle

The cell cycle is the life of a cell: interphase (rest, replication and growth), mitosis (prophase, metaphase, anaphase, telophase) and cytokinesis (splitting). Follow the different stages of the chromosome. See Cell Cycle

Analysing Cells

Different components of cells can be seen using the electron microscope which is very powerful. Differential centrifugation is a process that breaks open a cell and it is homogenised and centrifuged. See Analysing Cells