O-LevelBiologyHuman Nutrition5090/21 · Oct/Nov 2014 · Q212 Marks
Fig. 2.1 shows the digestion, absorption and assimilation of a chemical (B). It also shows the formation of its waste product, chemical F. [Figure 2.1]
- (a)Name chemical B enzyme C chemical D carbohydrate E chemical F[5]
- (b)(i)Describe what happens to carbohydrate E before it can be used in metabolic reactions in body cells.[2]
- (b)(ii)Name the process in which the product of carbohydrate E is used within a body cell. process[1]
- (b)(iii)Describe how different types of body cells and tissues make use of this process.[4]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [5] B = protein / (poly)peptide ;
- [5] C = protease or named* ;
- [5] D = amino acids* ;
- [5] E = glycogen ;
- [5] F = urea ;
- [max. 2] broken down / converted / changed ;
- [max. 2] (role of) glucagon / adrenaline ;
- [max. 2] to glucose ;
- [max. 2] made soluble ;
- [1] respiration ;
- [1] to release energy ;
- [max. 3] any 3 from: for growth ;
- [max. 3] mitosis / meiosis / cell division ;
- [max. 3] active transport ;
- [max. 3] impulse production ;
- [max. 3] temperature regulation ;
- [max. 3] muscular activity / movement ;
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