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By UYSEG) University of York Science Education Group, Curriculum Centre Nuffield

ISBN-10: 1405896078

ISBN-13: 9781405896078

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These circulate in the bloodstream and bind to receptor sites on cell membranes before being taken up by the cells. Excess LDLs in the diet overload these membrane receptors, resulting in high blood cholesterol levels. Saturated fats may also reduce the activity of LDL receptors so the LDLs are not removed from the blood, thus further increasing the blood cholesterol levels. This cholesterol may be deposited in the artery walls forming atheromas. • high-density lipoproteins (HDLs) – HDLs have a higher percentage of protein compared with LDLs, hence their higher density.

Once weaning starts, a baby starts to take in solid food as well. This is where culture steps in. Adults across the globe eat very different food, and children, by and large, eat what they are given. The result is that we get used, as we grow up, to eating food that other people may think bizarre, even disgusting. Would you like to eat insect larvae, whale meat or sea cucumbers? Plenty of people do. Indeed, these foods are considered a delicacy in many countries. There aren’t just national differences in diet.

32 The glycosidic bond between the two glucose molecules in maltose can be split by hydrolysis. In this reaction water is added. Industrially this is carried out using the enzyme lactase. 33). Asian and Afro-Caribbean people have a particularly high rate of lactose intolerance, so the resulting lactose-free milk is particularly suitable for food-aid programs. Untreated milk would cause further problems for people already suffering from malnutrition and dehydration. 33 Whey waste from cheese-making contains lactose.

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Salters Nuffield Advanced Biology AS Student Book (Edexcel A Level Sciences) by UYSEG) University of York Science Education Group, Curriculum Centre Nuffield

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