BIOLOGY Paper 1

Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Show all your working. • Do all rough work in this book. Cross through any work you do not want to be marked. Information • The marks for the questions are shown in brackets. • The maximum mark for this paper is 75. Answer all questions in the spaces provided. box . Figure 1 shows the structure of some biological molecules. Figure 1 Complete Table 1 by writing the correct letter, A, B, C, D or E, in the box next to each statement. Each letter may be used once, more than once, or not at all. box [4 marks] Table 1 Letter Statement is hydrolysed in the ileum and a product of this hydrolysis is found in micelles is formed by a condensation reaction between two α-glucose molecules is formed by the action of DNA polymerase gives a positive result in an emulsion test . Describe the mechanism for the absorption of amino acids in the ileum. [4 marks] Turn over for the next question Turn over ► box . Complete Table 2 to give four structural differences between a DNA molecule and an mRNA molecule. [4 marks] Table 2