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It can either be internal in Mind Map - 2. - Explain the principle of the a direct ELISA test. tRNA is a single stranded molecule with a binding site at one end thus it can only carry one type of amino acid, and a triplet of bases (anti- substrate level phosphorylation. 1 Inheritance and Hardy-Weinberg Principle QP; 7. 1 Monomers and polymers + 1. AS BIOLOGY Unit 1 Biology and disease Thursday 26 May 2016 Time allowed: 1 hour 15 minutes Materials For this paper you must have: a ruler with millimetre measurements a calculator. 0. Cell-surface membranes are made up of a phospholipid bilayer which makes them selectively permeable . £50 / hour. Page 13 of 16 Q7. An adaptation may be anatomical, physiological or behavioural. Figure 5. • Student A sat with her eyes shut and her forearm resting on a worktop so that her hand was over the edge. SGLT1 is a carrier protein found in the cell-surface membrane of this cell, it transports AQA retains the copyright on all its publications. 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