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MCAT Organic Chemistry 2

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. What stabilizes lipid bilayer?






2. What configuration do all naturally occuring amino acids have?






3. Nonpolar - hydrophobic amino acids






4. 4 causes of denaturation of proteins






5. Unique feature of cysteine






6. Right handed helix w/ carboxyl of one amino acid bound to the amine of another amino acid three residues away - proline never resides in this structure b/c it would place a kink in the helix






7. Physiological pH






8. Hydrophobic and hydrophilic interactions btw amino acids more distant from each other on the polypeptide chain






9. Fatty acid w/ no double bonds and maximum number of hydrogens






10. (+) and (-) describe what?






11. Sulfur containing amino acids






12. Glycosidic linkage of maltose






13. PH at which positive and negative charges balance to form a zwitterion






14. Basic amino acids






15. Fxn of cholesterol in the membrane?






16. Characteristics of polar amino acids






17. Hydrolysis






18. (R) and (S) describe what?






19. Energy storage molecule of carbohydrates for animals






20. Acidic amino acids






21. 3 physiological roles of lipids






22. Macromolecule that performs a variety of bodily functions and is composed of up to 20 different amino acids






23. Interaction btw polypeptide subunits arranged in polypeptide. can be covalent bonds or intermolecular forces - disulfide bond that does not form btw residues on the same protein affect (blank)






24. 3 carbon triol that forms backbone of triacylglycerol






25. Glycosidic linkage of lactose






26. What kind of lipids compromise the lipid bilayer?






27. Energy storage molecule of carbohydrates for plants






28. Separation is due to charge - with negative charge moving toward positive electrode and positive charge moving toward negative electrode






29. 2 reasons why fats have more efficient energy stores than carbs






30. Storage form of fatty acid that is composed of 3 esterified fatty acid to a glycerol molecule






31. Fatty acid w/ one or more double bonds in cis form predominately






32. Adjacent polypeptide strands running in the same direction in Beta pleated sheet structure






33. Name for 6 membered ring






34. 2 things that accelerate the rate of hydrolysis for peptide cleavage?






35. Name for 5 membered ring






36. Molecules with the same atoms and same bonds - but different bond geometries; can either be enantiomers or diastereomers






37. Interconversion btw two anomers






38. Generated btw either thiols on different proteins or thiols on the same protein






39. Adjacent polypeptide strands running in opposite directions in Beta pleated sheet structure






40. Acetic acid formula?






41. PH at which the amino acid has a net neutral charge






42. Sugar with an aldehyde at the first carbon position






43. 1. it requires an enzyme to linearize and mutarotate 2. it is not a reducing sugar and give negative Benedict's test






44. Property of fatty acids where one end is hydrophobic and the other is hydrophilic






45. Amino group placed on the left of a fischer projection is a?






46. Glyceraldehyde






47. Covalent bond formed btw carboxyl group of one atom and the amino group of another amino acid in an addition - elimination mechanism - enzymes are required to carry out rxn






48. Structure where H bonds occur btw residues distant from each other - or on a separate chain. backbone is extended rather than coiled






49. Epimers of sugars that vary in the configuration of their anomeric carbons






50. 1.has partial double bond character due to resonance 2. it cannot rotate 3. amide H is someWhat acidic and can H bond







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