CAPE Biology Unit 1 · 2014 · Paper 1 · Question Q5

Item 5 refers to the following information. A student crushes two foods, X and Y, and performs food tests on the extracts. The results are shown in the table below. \begin{tabular}{|l|l|l|} \hline \multicolumn{1}{|c|}{\textbf{Test}} & \multicolumn{2}{c|}{\textbf{Observation}} \\ \cline{2-3} & \textbf{Food X} & \textbf{Food Y} \\ \hline Benedict's & Blue & Orange precipitate \\ \hline Iodine & Blue-black & Blue-black \\ \hline Emulsion & Cloudy & Clear \\ \hline Biuret & Blue & Purple \\ \hline \end{tabular} Which of the following combinations indicates which molecules may be present in the foods, X and Y?

1. (A)Food X: Fat, starch, sucrose; Food Y: Protein, starch, sucrose
2. (B)Food X: Glucose, protein, starch; Food Y: Fat, protein, sucrose
3. (C)Food X: Fat, starch, sucrose; Food Y: Glucose, protein, starch
4. (D)Food X: Fat, protein, starch; Food Y: Glucose, protein, starch