pset1Q - Name_ Section_ TA_ 2010 7.012 Problem Set 1 Please...

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Name_____________________________________ Section_______ TA_____________ 1 2010 7.012 Problem Set 1 Please print out this problem set and answer the questions on the printout. Answers to this problem set are to be turned in at the box outside 68-120 before 1:15 pm, Friday Sept 17 th . Question 1 The major macromolecules present in the cells of all living organisms are proteins, nucleic acids, carbohydrates and lipids. These macromolecules (with the exception of most lipids) are formed by the joining of specific monomers. a) Name the four elements commonly found in the major types of biological macromolecules. b) From the following, circle the type of bond or interaction that joins the monomers to form the polymers. Covalent bonds ionic bonds hydrophobic interactions van der Waals forces c) What is produced as a byproduct of a condensation reaction? d) Proteins are among the major classes of biological macromolecules. They show organelle –specific location and have defined functions. List the subcellular location of each of the following eukaryotic proteins in their active (functional) state. Choose from: Lysosomes, Extracellular matrix (ECM), cytoplasm, nucleus, mitochondria, endoplasmic reticulum, golgi body, cell wall. Protein Location in active (functional) state A protein that binds to deoxyribonucleic acid (DNA) A protein that glues the cells together into tissues A protein involved in the synthesis of ATP via oxidative phosphorylation A protein involved in the synthesis of ATP via Fermentation Question 2 a) Consider the following carbohydrate that is a part of a protein . i. Name each bond or interaction that is circled in the schematic above. Explain why you selected these options. Choose from polar covalent, nonpolar covalent, ionic, hydrophobic, van der Waals . Bond #1 (C-C): Bond #2 (C-OH): #1 #2 H
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Name_____________________________________ Section_______ TA_____________ 2 Question 2 continued ii. Would you expect this polymer shown in 2 (a) on the previous page to be soluble in the aqueous environment? Explain your answer. iii. What type of bonds or interactions occur between two such long polymers? Choose from: covalent, hydrogen, hydrophobic, ionic, van der Waals . Explain your answer. b) Proteins are composed of amino acids. i. Draw a peptide N-ala-gly-val-C in the form it would be at pH=7. ii. Circle each peptide bond in your drawing above. iii. The side-chains of the amino acids that make this peptide would be classified as… Polar, non-polar, charged, uncharged, hydrophilic, /hydrophobic . Circle all the correct options. iv. How does the amino acid glycine (gly) differ from all the other amino acids? c) Consider the structures below to answer the following questions. i.
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pset1Q - Name_ Section_ TA_ 2010 7.012 Problem Set 1 Please...

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