Bbc bitesize gcse enzymes and digestion,probiotics and intestinal worms,align probiotic upset stomach symptoms,best treatment for acne scars and pigmentation - Test Out

Bitesize Levels Primary KS1 Early and 1st level KS2 2nd level Secondary 3rd level 4th level CA3 KS3 GCSE National 4 National 5 NA iseanta 4 NA iseanta 5 TGAU Higher A€rd A?re All subjects Home GCSE Science Biology Nutrition, digestion and excretion Digestive system Digestion is the breakdown of carbohydrates, proteins and fats into small soluble substances to be absorbed into the blood. The table shows the main structures and associated organs of the human alimentary canal (or gut), and their functions. Because this reaction is catalysed (sped up) by enzymes [enzyme: Proteins which catalyse or speed up chemical reactions inside our bodies. The optimum conditions for the bacterial enzymes are similar to those required by the enzymes in the yeast used in traditional fermentation. This is why homeostasis is important - to keep our body temperature at a constant 37°C.As the temperature increases, so does the rate of chemical reaction. The digestive enzymes are a good example of this.Stomach acidThe stomach produces hydrochloric acid. It is used in the manufacture of fertilisers, explosives, dyes, medicines and a variety of other chemicals. This is difficult because nitrogen is such an unreactive [unreactive: Does not easily take part in chemical reactions. This means that there is a limit to the concentration of ethanol that can be achieved through fermentation.


This is because heat energy causes more collisions, with more energy, between the enzyme molecules and other molecules. This helps to begin digestion, and it kills many harmful microorganisms that might have been swallowed along with the food.
Some naturally-occurring bacteria use enzymes [enzyme: Proteins which catalyse or speed up chemical reactions inside our bodies. Enzymes are a vital in chemical digestion of food in the gut.] enzymes in yeast become denatured and the growth rate slows.
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However, if the temperature gets too high, the enzyme is denatured and stops working.A common error in exams is to write that enzymes are killed at high temperatures. The enzymes in the stomach work best in acidic conditions - in other words, at a low pH.BileAfter the stomach, food travels to the small intestine.
Enzymes are a vital in chemical digestion of food in the gut.]  to ‘fix’ nitrogen from the air, but these natural processes are not sufficient to sustain the world’s population. Since enzymes are not living things, they cannot be killed.Graph showing the effects of temperature on enzyme activityOne enzyme - one jobEnzymes are specific.


The enzymes in the small intestine work best in alkaline conditions, but the food is acidic after being in the stomach. A substance called bile neutralises the acid to provide the alkaline conditions needed in the small intestine.
Just like only one key can open a lock, only one type of enzyme can speed up a specific reaction. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so. Plants can turn the glucose produced in photosynthesis into starch for storage, and turn it back into glucose when it is needed for respiration.



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