Biology HSC Notes - Maintaining a Balance

Biology (HSC Course) Topic 1: Maintaining a Balance Enzymes The usage of Enzymes Enzymes social occasion is to maintain the localise of chemical activity in an organism. They argon biological catalysts, increase the rate of reaction in metabolic processes. They also alter reactions to occur at refuse temperatures, which means that personate temperatures do not have to be so high. Chemical Composition Enzymes argon specialized freehanded proteins, which are composed of chains of amino acids, which are folded, to bring on a 3-D protein structure. (3D: rouse be denatured). Lock-and-key implement (model) Enzymes reign specific reactions, therefore only one increase ignore react with a particular enzyme. The model employ describes how the enzyme tight fits into the shape of the substratum (compound). The active site is where the enzyme catalyses the reaction. Diagram: acidulousness of a substance PH levels describe the acidity of a substance. pH ranges fr om 1-14, where lower levels are acidic, higher levels are canonic and 7 is neutral. Maintenance of a unvarying internal purlieu The maintenance of a constant internal environment is master(prenominal) for optimal metabolic efficiency. This is because enzymes require specific temperatures, substrate parsimony and pH levels to be able to function thereby maintaining optimal metabolic efficiency. There is only a actually minute temp range and pH range in which enzymes can work. Temp: 36-40 pH: 7.35-7.45 Specific concentrations of hormones, salts, glucose, water Homeostasis Homeostasis is the process by which organisms maintain a comparatively stable internal environment.

The 2 Stages of Homeostasis The organism detects changes from the stable verbalize e.g. change in body temp. The organism responds and counteracts the changes to bring the body back to its stable state. The role of the Nervous System The body detects changes via the sickening system, which along with the ductless gland system, co-ordinates and controls the... im sure everyone has a different panache of prep for exams. From a HSC perspective i would comment adage these are most to breif going into trials (and im only in yr 11). good destiny with the exams though. If you want to get a in force(p) essay, order it on our website: BestEssayCheap.com

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