See attachments for full descriptions of the problems
37. The most basic amino acid is ________
38. The most acidic amino acid is ________
39. The reaction below (see attached) is an example of:
a. nucleophilic addition
b. electrophilic addition
c. nucleophilic acyl substitution
d. electrophilic substitution
Use the following terms for the next few questions:
b. Fibrous proteins
c. Conjugated protein
e. Simple protein
f. Globular proteins
40. _________ Proteins which yield other compounds in addition to amino acids on hydrolysis
41. _________ Proteins which are tough and insoluble in water
42. _________ Enzymes which catalyze the breaking away of a small molecule such as H2O from a substrate.
43. _________ Enzymes which catalyze the bonding together of two substrates.
Match the diagrams in the attachment to:
44. starting material for fatty acid biosynthesis
45. a phosophoglyceride
46. a prostaglandin
47. monoterpene precursor
48. a triglyceride
49. a sphingolipid
50. a soap
51. a cephalin
52. a steroid
53. a sesquiterpene
54. Abietic acid is an example of:
a. a monoterpene
b. a sesquiterpene
c. a diterpene
d. a sesterpene
55. Draw the most stable chair conformation of terpin hydrate.
56. Mixtures of esters of long-chain carboxylic acids with long-chain alcohols are called:
b. fats and oils
c. fatty acids
57. Chemically, these are triacylglycerols, triesters of glycerol with three long-chain carboxylic acids.
b. fats and oils
c. fatty acids
58. The major lipid components of cell membranes are:
59. A group of C20 lipids that contain a five-membered ring with two long side chains
60. Cell membranes, which form an effective barrier to the passage of ions and other components into and out of the cell, are:
a. fatty acid esters
c. lipid bilayers
Twenty Three Biochemistry Test Review Questions with Structures
Proteins and Lipid Structures!!!
37. Arginine is the most basic amino acid because it has the highest isoelectric point. That's the pH at which the molecule is neutral.
38. The most acidic is, therefore, glutamic acid.
39. The reaction is a nucleophilic addition ...
A selection of organic chemistry problems involving amino acids, fill in the blanks, matching and fatty acids.
Fatty acids, membrane proteins, steroids, lipid bilayers, prostaglandin synthase, arachidonic acid.
Which fatty acid -palmitic, stearic, palmitoleic, or arachidonic, would have lowest m.p. and explain why.
Which would be chiral? A)glyceryl tripalmitate,B) glyceryl 1-stearate, 2,3 dipalmitate,C) glyceryl 2-stearate, 1,3-dipalmitate. Explain why.
A lipid is isolated and treated with boiling aqueous NaOH. The products obtained are sphingosine, sodium stearate,glucose,galactose and mannose. To which class would this lipid belong? Explain.
What is the major driving force in the formation of lipid bilayers?
Which amino acid, Lys or Val, would be more likely to be found in the transmembrane section of an integral membrane protein. Explain.
A certain membrane protein has palmitic acid covalently bonded to its N-terminal amino acid. The protein consists primarily of charged amino acids, particularly Lys and Arg. Do you think this would be a periperal or integral membrane protein? Why? What is the probable function of the palmitic acid?
Explain the orientation of polar and nonpolar amino acid side chains in the transmembrane sections of channel proteins (either alpha helix or beta sheet) and how this contributes to the function of these proteins?
How many chiral carbons does cholesterol have? Draw the structure and show them.
Why do phospholipids form bilayers rather than micelles?
Is prostaglandin synthase a peripheral or integral membrane protein?
Explain how the substrate of prostaglandin synthase, arachidonic acid, reaches the active site without passing thru an aqueous environment.
Explain why an unsaturated fatty acid will have a lower m.p. than a saturated fatty acid containing the same number of carbons.
The steroid hormone which is closest in chemical structure to cholesterol is?
A female lacks the enzyme which removes the methyl group from the 10 position of the steroid ring on testosterone. Discuss the possible physiological implications of this mutation.View Full Posting Details