2 marksAspects of Biochemistry

CAPE Biology Unit 1 · 2013 · Paper 2 · Question 1(a)(i)

Table 1 presents results of an investigation of the nutritional composition of various foods from an average American diet, using known reagents. The Grease Spot on Brown Paper Test involves rubbing a food sample on brown paper, removing excess food, and leaving it to dry for about 10 minutes. A translucent spot indicates a positive result. Isopropyl alcohol dissolves the nutrient in the food substance.

State the nutrient being tested for, by EACH of the following tests: Biuret, Benedict's, Lugol's Iodine, Grease spot.

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Other parts of this question

1(a)(ii)Using the data presented in Table 1, determine TWO food substances which contain all four nutrients being tested for in this investigation.[1 mark]
1(a)(iii)With reference to the qualitative results given in Table 1, suggest which foods are good sources of nutrients for cell structure and growth of the cell, and…[4 marks]
1(b)(i)Using a labelled arrow on Figure 1, highlight the location of EACH of the following: a) An alpha 1,4-glycosidic linkage b) An alpha 1,6-glycosidic linkage.[2 marks]
1(b)(ii)In the space below, sketch the general shape of one glycogen molecule. [Details of individual glucose residues are NOT required.][2 marks]
1(b)(iii)Amylose (starch) and cellulose are both polymers of glucose molecules but they differ in their structure and function in plant cells. With reference to ONE…[4 marks]

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