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- Question 10 Observe this structure, use the pK, table, and choose the CORRECT statement. H2N-CH-C-OH CH2 OH O Tyrosine's side chain is involved in hydrogen bonding typical of secondary structures O Tyrosine's alpha carboxyl group is the most acid of the three dissociable groups O Tyrosine's side chain is partially dissociated at physiological pH O All of these are correctQuestion 1 Unsaturated fatty acids are commonly esterified at the hydroxyl substituent of glycerol at what carbon number? 1st carbon 2nd carbon O grd carbon All carbonsQUESTION 1 Which of the following concepts in column A best fits the concept in column B. p-Nitrophenyl a-D-Glucoside Action of intracellular a-GLUCOSIDASE + NaHCO3 Boiling cells Tris-pH 5.0 A. Substance that act as molecular mimic of a maltose molecule B. Develops TT-Nitrophenyl into a yellow colour reagent for measurement at 400nm c. Breaks the a-linkages of p-Nitrophenyl a-D-Glucoside, leaving p-Nitrophenyl and a glucose molecule D. Allows transport of p-Nitrophenyl a-D-Glucoside across the membrane E. Stop the reaction and release internal p-Nitrophenyl
- Question 2. An enzyme was found to convert Acetyl-coA to an acetyl-cysteine intermediate of the enzyme. The structure of cOA is: H H НО СН; HS — СH2— СH2 — N—C—CH,— CH2—N- С—С—С—CH;—0—Р- 0–CH2 Adenine н CH H H H Phosphopantetheine group of coenzyme A 2-O3PO ОН Draw a plausible chemical mechanism. Where is the acetyl-group in acetyl-coA? What is the reactive group of the protein? The reaction is enhanced at higher pH. How is this consistent with your mechanism? Is covalent catalysis involved?Question 11 Observe the titration curve below and choose the CORRECT statement. 12 - pK2 10 8- PK, 2. 0.5 1.0 1.5 Equivalents of OHO 2.0 O Two of these are correct O At point A, both acidic groups are protonated O At point A, both acidic groups are deprotonated O Cis the end point of titration for the most acidic group O B is the end point of titration for the most acidic group « Previous N. LG rotein d (basic)Rgoup Jacidic) Rgroup ged RgroupQuestion 40 Answer the following questions based on the structure below. Phospholipase A, 'CH2-O- 2CH-0,č, Phospholipase A2 3CH2 Phospholipase C H 0=P-0- ÓH H он но H H Phospholipase D Treatment of this compound with Phospholipase D leads to and OA triacyl glycerol; inositol diphosphate O B. diacyl glycerol; inositol triphosphate phosphatidic acid; inositol diphosphate All of the above. O D. None of the above. O E
- QUESTION 26 The best description of a glycoprotein is only amino acids polymerized in a chain amino acid chains with covalently bound heme groups O amino acid chains and bound carbohydrate O a protein with a covalently bound lipid Oa polysaccharide with a fatty acid modificationQuestion 1 (Mandatory) ( Phospholipids contain a glycerol backbone attached to two fatty acid hydrocarbon tails (often 18-20 carbons long), and a phosphate-containing polar group True False Question 2 (Mandatory) (1 point) Lipids are glycosylated in the Golgi (glycosylation), with oligosaccharides added on the lumen side True FalseQuestion 3 Match the following descriptions to the given choices. The first molecule in the biosynthesis of steroids A. Aldosterone that contains the cyclopentanoperhydrophenanthrene ring B. Androstenedione C. Estrone The sterol that will serve as the precursor for the synthesis of bile acids and steroid hormones D. Cholic acid v A bile acid E. Cholesterol v A mineralcorticoid F. Lanosterol Promotes male secondary sex characterictics
- Question 33 The amount and composition of dietary fat are important factors for influencing blood lipid metabolism. Which of the following statements is correct? Replacement of saturated fatty acids with large amounts of carbohydrate is associated with decreased LDL and increased plasma triglyceride concentrations Replacement of saturated fatty acids with n-6 polyunsaturated fatty acids is associated with a reduction in plasma triglyceride concentrations Consumption of soluble dietary fibre and plant stanols/sterols is associated with a significant increases in LDL cholesterol Replacement of saturated fatty acids with monounsaturated fatty acids is associated with an increase in LDL cholesterolospholipidsQuestion 11 Which carbons of glucose will be incorporated into Palmitic acid by the Fatty acid Synthase? Multiple answers: Multiple answers are accepted for this question Select one or more answers and submit. For keyboard navigation. SHOW MORE V a Carbon 1 Carbon 2 Carbon 3 d Carbon 4 e Carbon 5 f Carbon 6 All carbons will be incorporated. h No carbons will be incorporated.Question 10 The reaction in which a disaccharide is broken down into its component monosaccharides is enediol formation. O hydrolysis. glycoside formation. oxidation. reduction.