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Bio Biological Molecules
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  Cambridge AS Level Biology Section: B ‘Biological Molecules’   Waleed Ahmad Khan 0347  –  4443879 Page 1    A Levels (ECP) 1.   The diagram shows a reaction resulting in the formation of a bond between two molecules. Which bond is formed and what is the type of reaction? 2.   What is the general formula for a monosaccharide? A C(H 2 O) n B (CH 2 O) n C C 2 (H 2 O) n D C n (H 2 O)   3.   Four sugar solutions were tested with a standard Benedict’s solution. The table shows the colour of the solutions after testing. What is the best interpretation of the results?  Cambridge AS Level Biology Section: B ‘Biological Molecules’   Waleed Ahmad Khan 0347  –  4443879 Page 2    A Levels (ECP) 4.   Which molecule is found in glycogen? 5.   The diagram shows a molecule which is an important component of living organisms. A forensic sample is tested for the presence of a polymer of this molecule. Which polymer is tested for? A DNA B lipid C protein D starch 6.   How many fatty acid residues are normally present in a phospholipid molecule? A 1 B 2 C 3 D 4 7. What is the theoretical number of chemically different dipeptides that may be assembled from 12 different types of amino acids?  A 24 B 72 C 144 D 400 8. What are the features of triglycerides?  Cambridge AS Level Biology Section: B ‘Biological Molecules’   Waleed Ahmad Khan 0347  –  4443879 Page 3    A Levels (ECP) 9. Which polysaccharides are branched and which are unbranched? 10. The diagram shows a molecule. Which arrow labels a peptide bond? Which bonds are the last to break when an enzyme is heated?  A disulphide B hydrogen C hydrophobic interactions D ionic 11. How many haem groups are there in one molecule of human haemoglobin?  A 1 B 2 C 3 D 4 12. Which substance contains carbon, hydrogen, oxygen and nitrogen?  A collagen B glycogen C amylopectin D triglyceride 13. Which levels of protein structure are demonstrated by a haemoglobin molecule?  Cambridge AS Level Biology Section: B ‘Biological Molecules’   Waleed Ahmad Khan 0347  –  4443879 Page 4    A Levels (ECP) 14. The diagram shows two molecules of glucose. Four possible bonding positions are labelled p, q, r, and s, and t, u, v, w. When these two molecules condense to form glycogen, where could bonds form?  A p - u or p  –  v B p - u or q - w C p - v or q  –  w D p - w or v - w 15. The diagram shows a molecule. Which test on a polymer of this molecule would give a positive result?  A adding biuret solution B adding iodine in potassium iodide solution C heating with Benedict’s solution  D shaking with ethanol then pouring into water 16. Which property of water minimises temperature changes in cells and organisms?  A cohesion B heat of vaporisation C maximum density at 4 o C D specific heat capacity 17. The graph shows the effect of pH on the structure of a protein which consists entirely of repeating residues of one amino acid. Which statement is true?  A At pH2 the protein has lost its secondary structure. B At pH2 the protein has lost its tertiary structure. C At pH10 the protein has lost its primary structure. D At pH10 the protein has lost its secondary structure..
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