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275 Words


Ribosomes are the sites within cells where proteins are ..

The nucleus is surrounded by the nuclear membrane
ribosome - small organelles composed of RNA-rich cytoplasmic granules that are sites of protein synthesis.
rough endoplasmic reticulum - (rough ER) a vast system of interconnected, membranous, infolded and convoluted sacks that are located in the cell's cytoplasm (the ER is continuous with the outer nuclear membrane).

A Science Odyssey: You Try It: DNA Workshop - PBS

Exotoxinsare usually secreted by bacteria and act at a site removed frombacterial growth. However, in some cases, exotoxins are only releasedbylysis of the bacterial cell. Exotoxins are usually proteins, minimallypolypeptides, that act enzymatically or through direct action with hostcells and stimulate a variety of host responses. Most exotoxins act attissue sites remote from the original point of bacterial invasionor growth. However, some bacterial exotoxins act at the site ofpathogen colonizationand may play a role in invasion.

An embryonic cell divides again and again

At a chemical level, there are two main types ofbacterial toxins,lipopolysaccharides,which are associated with the cell wall of Gram-negative bacteria, andproteins,which are released from bacterial cells and may act at tissue sitesremovedfrom the site of bacterial growth. The cell-associated toxinsare referred to as endotoxinsand the extracellulardiffusible toxins are referred to as exotoxins.

The net increase in total protein during development of tomato fruit locule tissue has been further investigated with respect to the sites of protein synthesis within the cells. The results point to the plastids as being the major sites of protein synthesis. This is supported by radioisotope experiments in which labelled carbon from bicarbonate has been show to appear in protein at a higher rate than exogenously supplied amino acid. Isolated plastids incorporate carbon from bicarbonate, glucose and pyruvate into protein, and it is suggested that the pathway of carbon into protein involves photosynthetic pathways. The results are discussed with reference to possible differences between protein synthesis in plastids, and protein synthesis in the cytoplasm of plant cells.

Where there was one cell there are two, then four, then eight,..

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