IB BIO I Macromolecule Test Van Roekel. Name Date Period. 1. Which of the following reactions occurs when a dipeptide is formed from amino acids?

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1 IB BI I Macromolecule Test Van Roekel ame Date Period 1. Which of the following reactions occurs when a dipeptide is formed from amino acids? ydrolysis Denaturation. ondensation xidation. Which structure represents an amino acid? S. 3. Which is not a primary function of protein molecules? ormones/regulatory Energy storage. Transport Structure 4. Which of the following could cause denaturation of an enzyme? Substrate concentration A competitive inhibitor. igh temperature Low salt concentration 1

2 IB BI I Macromolecule Test Van Roekel 5. Which diagram correctly illustrates a dipeptide?. 6. What determines the specificity of an enzyme for its substrate? The temperature at which it is operating The optimum p of the enzymes. The concentration of the substrate The structure of the enzyme molecule 7. What is an active site? The part of an enzyme that binds only to the product molecules. The sequence of amino acids responsible for the catalytic activity of enzymes.. The sequence of amino acids responsible for the structure of an enzyme. The specific area responsible for the activity of all proteins. 9. Which graph shows the relationship between the substrate concentration and the rate of an enzyme controlled reaction? Rate of reaction Rate of reaction Substrate concentration Substrate concentration.

3 IB BI I Macromolecule Test Van Roekel 8. What happens during end product inhibition of the pathway shown below? Substance W enzyme I Substance X enzyme II Substance Y enzyme III Substance Z Enzyme I is inhibited by substance X. Enzyme I is inhibited by substance Z.. Enzyme III is inhibited by substance W. Enzyme III is inhibited by substance Y. 10. The graph below shows enzyme activity plotted against temperature. What is happening at point I? Enzyme activity / arbitrary units I Temperature / The enzyme is being denatured. p changes are slowing the reaction.. The concentration of the substrate remains constant. The reaction is increasing in speed. 3

4 IB BI I Macromolecule Test Van Roekel 11. The diagram below represents a DA nucleotide. What could the part labelled X represent? Ribose Uracil. Guanine Phosphate 1. In the structure of DA what binds with cytosine? Deoxyribose Ribose. Thymine Adenine 13. What type of bond holds the complementary base pairs together in a double helix of DA? ovalent bonds Peptide bonds. Glycosidic bonds ydrogen bonds 14. What are the components of a DA nucleotide? Deoxyribose, a phosphate and one of the bases: adenine, cytosine, guanine or thymine Ribose, a phosphate and one of the bases: adenine, cytosine, guanine or uracil. Deoxyribose, a nitrate and one of the bases: adenine, cytosine, guanine or thymine Ribose, a nitrate and one of the bases: adenine, cytosine, guanine or thymine 4

5 IB BI I Macromolecule Test Van Roekel 15. Which molecule represents ribose?. 16. What is a role of carbohydrates in animal cells? As channels for passive transport As enzymes. As energy storage As components of the animal cell wall 17. Which molecule is a monosaccharide? Ribose Glycogen. Amylase Glycerol 18. What is the maximum number of fatty acids that can be condensed with glycerol? ne Two. Three Four 5

6 IB BI I Macromolecule Test Van Roekel 19. Which is the structure of glycerol?. Short Answer 0. Explain the effect of substrate concentration on enzyme activity. (Total 3 marks) 1. Distinguish between the structure of DA and R (Total 3 marks). The diagrams below show various molecular structures. I. ( ) 3 n II. III. IV. R (a) Identify which of the diagrams represent (i) (ii) (iii) the structure of glucose; the structure of amino acids; the structure of fatty acids. 3. utline how monosaccharides are converted into polysaccharides. (Total marks) 6

7 IB BI I Macromolecule Test Van Roekel 4. List four functions of proteins, giving an example of each. 5. utline enzyme-substrate specificity. 6. Explain the effects of temperature, p and substrate concentration on enzyme activity. 7. Draw a diagram of the molecular structure of a portion of D (Total 4 marks) (Total 5 marks) (Total 8 marks) (Total 4 marks) 7