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By Pisuth Ek-Amnuay

The beetles, participants of the Order Coleoptera are the biggest order of bugs, with approximately forty % of identified species of overall insect global or approximately 400,000 species. My first version of this booklet used to be released in 2002 and was once additionally the 1st booklet of beetles to be had in Thailand. this can be a revised variation, emphasizing the species content material and hazard of extra species for all these beetle households, this version includes 509 species in comparison to the 1st variation which incorporated simply 362 species and subspecies.

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The G-protein then activates an enzyme, which brings about a reaction inside the cell. 5c shows a third type of signalling, this time involving a receptor that is also an enzyme. The receptor is made up of two parts. When the signal molecule arrives, it slots into both of these parts, connecting them to one another and forming them into an active enzyme. The enzyme then brings about reactions inside the cell. g. 5 Mechanisms of cell signalling: a receptor acts as an ion channel; b receptor activates a G-protein; c receptor acts as an enzyme.

Signals arrive at the plasma membrane from outside the cell as particular substances – for example, a hormone – or changes in electrical potential – as happens in nerve impulses. A receptor in the cell’s plasma membrane picks up these signals, and brings about actions within the cell. This process is known as cell signalling. You will meet several different examples of cell signalling as you continue through your Biology course, especially in the context of coordination by hormones and nerve impulses.

Unable to move, sponges cannot flee from other animals that eat them. Many of them have evolved a defence mechanism – they secrete toxic chemicals that deter predators, and also prevent other sponges from growing too close to them. Indeed, some other kinds of marine organisms, such as some species of crabs, carry sponges around on their bodies as a defence against predators. Some of these chemicals show promise as drugs to fight human diseases. For example, a compound called halichondrin, derived from the sponge Lissodendoryx, is being developed as a possible anti-cancer drug.

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