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Q. Do enzymes act better under basic or acid pH?
Most enzymes act in pH between 6 and 8, a range that corresponds to the general acidic level of blood and cells. There are enzymes, however, that act only under very basic or very acid pH. So enzyme activity depends on pH interval.
In the stomach, for example, the gastric juice has a very low pH, around 2, and there the enzyme pepsin acts to intensively absorb proteins. In the duodenum, pancreatic secretions increase the pH of the enteric juice for the action of other digestive enzymes, for example, trypsin.
In a numeric pyramid to which trophic level does the base always refer? What about the top level? In a numeric pyramid the base corresponds to the first trophic level, i.e., to
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Figure shows part of a DNA molecule (a) (i) What do the dotted lines in Figure represent? (ii) Name J to M. J.............................. K..............................
Most of the water taken up by a plant passes through it and is evaporated to the atmosphere.What use is made of the tiny fraction of this water which is retained by the plant?
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