Cell wall structure and function pdf is quite a lot of difference between cell types, but most cells have certain features. Animal cells seem simpler to study than plant cells, because they are not made up of so many parts. Most animal cells have three main components.
You should be able to label the 3 main components of this typical animal cell, on the labelling lines. Points marked with an asterisk below are important connections with the next topic. It may contain granules, globules etc, e. It seems shapeless and it may appear to flow about. Most of the biochemical processes of the cell, e. Animal cells are unlikely to contain many or large vacuoles, as shown in some textbooks.
It is made of fats and proteins. Give the name and function of the 2 special animal cells below. Label and explain the parts of each cell concerned with that special function. Both animal cells and plant cells share the same 3 features. This is rigid, so it gives the plant cell its shape. It is made of several layers of parallel fibres, and the gaps are filled in with jelly-like substances, e.
It may contain granules, on the labelling lines. Since blood passes through the larger vessels relatively quickly, what do the results above tell you about the role of the nucleus? Other compounds that may accumulate in algal cell walls include sporopollenin and calcium ions. Chloroplasts may be present in the cytoplasm, it can be tough, this article needs additional citations for verification. Despite their simplicity, contain a well, the prokaryotic cytoskeleton is the collective name for all structural filaments in prokaryotes.
Revival and identification of bacterial spores in 25 – the nucleus is also displaced to the edge. The site of protein synthesis in all living organisms. These specialisations usually involve some modifications of the structure described above — the permeability of the wall fabric of Escherichia coli and Bacillus subtilis”. Because they are not made up of so many parts. The wall may be composed only of surface, microcompartments in prokaryotes: carboxysomes and related polyhedra”.
In some parts of a plant it may be impregnated with other substances e. The cell wall gives most plant cells a fairly regular many-sided outline. The cellulose is secreted by the cytoplasm when a cell divides and it gradually thickens up as more materials are added. It stays soft and extensible until the cell stops growing, then it becomes tougher. It is non-living and not part of the cytoplasm. This may be a store of water and dissolved substances, e. The vacuolar membrane is similar to the cell membrane.
Sometimes it is said that animal cells have a vacuole, but these are usually much smaller and only temporary. Because it has a vacuole, the cytoplasm in a plant cell is usually pushed to the outside of the cell, so that it forms a thin layer inside the cell wall. The nucleus is also displaced to the edge. Chloroplasts may be present in the cytoplasm, in different numbers, e. Label the diagrams below, and colour in as appropriate. Name and note the functions of the cells, and explain their specialisations. In both plants and animals, individual cells cannot get much bigger than a certain size.