Answer:
Iodine, or more accurately iodide (I-), is avidly taken up from blood by thyroid epithelial cells, which have on their outer plasma membrane a sodium-iodide symporter or "iodine trap". Once inside the cell, iodide is transported into the lumen of the follicle along with thyroglobulin.
Explanation:
Answer : B) In step 2, there was a chemical change which was observed in sugar.
Explanation : In A step 2 there was a physical change that was seen. By just boiling the dissolved salt solution salt was obtained. Therefore, it is a physical change. In B step 2 there was a chemical change seen as sugar solution was thickened and turned brown. It was not obtained in its original form; there was a chemical reaction that took place during sugar evaporation. As chemical change is the one where the reaction is irreversible.
Therefore only in B step 2 there was a chemical change that was observed.
Enzymes<span> are catalysts, which means that they make chemical reactions go faster, but are not changed by the reaction. For example, digestive </span>enzymes<span> cause food that you eat to be broken down much faster than </span>would<span> occur </span>without<span> them, but they are not broken down in the reaction they are speeding up.
hope this helps !
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