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Transcript
Cell Biology Homework – Key Area: Proteins and Enzymes Homework Exercise 6 1(a). Name the “building blocks” of a protein (1) (b). What determines the shape of a protein? (1) 2. Copy the table below and draw straight lines to match the protein to its function . Protein Group Function of a Protein A. Structural 1. These proteins are vital in the control of growth and development B. Enzyme 2. Membrane protein which allow cells to recognise specific substances C. Hormone 3. Are proteins that control all of the reactions taking place in a cell. D. Antibodies 4. These proteins form muscles, nail, hair and skin. E. Receptor 5. Protect us from disease (5) 3. With reference to enzymes, define the term biological catalyst. (1) Enzymes are biological catalysts. The diagram below shows part of an enzyme controlled reaction. (a) Describe the features of an enzyme which allow it to combine with only one substrate. (1) (b) What amount of living cells produce enzymes? (i) all (ii) most (iii) some (iv) a few 21 (1) Cell Biology Homework – Key Area: Proteins and Enzymes 4. Which line in the table below correctly shows information about an enzyme? Rate of the chemical reaction Enzyme at the end of the reaction A Speeds up unchanged B Slows down unchanged C Speeds up changed D Slows down changed (1) 5. The diagram below shows three stages X, Y and Z that occur when an enzyme converts a substrate into a product. enzyme (i) This enzyme promotes the breakdown of a complex molecule into simpler molecules. Put the stages into the correct order to show this degradation reaction. ________ ________ ________ (1) (ii) Which number in the diagram shows the active site? 22 (1) Cell Biology Homework – Key Area: Proteins and Enzymes 6. The diagram below shows an investigation into the digestion of starch by amylase, using a model gut. Which line in the table below describes correctly the content of a model gut which should be used as a control? Starch solution (cm3) Amylase solution (cm3) Water (cm3) A 10 0 1 B 0 10 1 C 10 1 0 D 1 0 10 (1) 23