Consider the following reaction catalyzed by Phosphopentose Epimerase at 37 °C. Xylulose 5-phosphate ---> Ribulose 5-phosphate At equilibrium, the ratio of Xylulose 5-P/Ribulose 5-P = 1/18.85 The physiological concentration of Xylulose 5-phosphate is 0.019 mM and the physiological concentration of of Ribulose 5-phosphate is 2.940 mM. Calculate AG. Type your answer...

A. Classify each of the following monosaccharides as aldose or ketose. (a) H. (b) CH2OH (c) CH2OH (d) H. C=0 C=0 HO-C-H H-C-H H-C-OH HO-C-H H-C-OH H-C-OH H-C-OH HO-C-H CH2OH H-C-OH CH2OH H-C-OH | CH2OH CH2OH Threose Ribulose Tagatose 2-Deoxyribose

Draw the structure of: (a) a polysaccharide formed by joining D-mannose units in 1->4-ß-glycosidic linkages; (b) a polysaccharide formed by joining D-glucose units in 1->6-a-glycosidic linkages. The polysaccharide in (b) is dextran, a component of dental plaque.

What carbohydrates is/are in your unknown? my unknown is sucrose Identifying an Unknown Carbohydrate Unknown No. Sucrose Results with Unknown Benedict's (A) Seliwanoff's (B) Fermentation (C) Iodine (D) negative Positive Positive negative Possible Sugars Present Sucrose + H₂0 starch + 420. sucrose and fructose Glucose, fructose, Sucrosé starch sucroset HCI

Understanding the optical rotation that we observe in lab is not the same as the specific rotation commonly reported in the literature; a student sets out to explore this on their own. They prepare a 0.083 g/mL sucrose solution, pour it into a 1 dm long optical cell, and measure the optical rotation of this solution to be 5.5 degrees. Use Biot's law to determine the specific rotation of sucrose and then the percent difference in compare this experimentally determined value against the accepted value provided above. Biot's law states www απ [a]lc where a is the observed optical rotation in units of degrees, 1 is the length of the cell in units of decimeters (dm), c is the sample concentration in units of grams per milliliter (g/mL), and [a] is the specific rotation in units of degrees (the formal unit for specific rotation is degrees divided by dmg/mL, but scientific literature uses just degrees). Percent difference = |Experimental value-Accepted value| Accepted value × 100%

Calculate the ΔGo’ for the following reaction at 37 oC: Galactose + Glucose → Lactose    + H2O       K’eq = 0.002089

Determine the branch points and reducing ends of amylopectin.         A 0.5g sample of amylopectin was analyzed to determine the fraction of the total glucose residues that are branch points in the structure. The sample was methylated and then digested, yielding 50 μmol of 2,3-methylglucose and 0.4 μmol of 1,2,3,6-tetramethyl glucose. (MWglucose = 162 g/mol, minus H2O)  What fraction of the total residues are branch points?  How many reducing ends does the amylopectin have?

Classify the following monosaccharides as an aldose or ketose. I need help on number 5, a-d.

Humans are able to digest amylose, but not cellulose. What structural features of these polysaccharides might be responsible for this? O amylose contains only beta glycosidic bonds where cellulose contains alpha glycosidic bonds O amylose contains only beta glycosidic bonds where cellulose contains alpha glycosidic bonds amylose contains only alpha peptide bonds where cellulose contains beta peptide bonds amylose contains only alpha glycosidic bonds where cellulose contains beta glycosidic bonds

Q2 CH,OH CH,OPO,2- H H OH H OH 0-PO,2- но но OH H. OH OH Glucose-1-phosphate Glucose-6-phosphate Calculate the standard free-energy change (AG°) fo the reaction catalyzed by the enzyme phosphoglucomutase. When at standard temperature (25 °C) and pressure, the equilibrium of each molecule is 1 mM glucose 1-phosphate and 19 mM glucose 6-phosphate. HINT: at 25 °C, RT = 2.479 kJ/mol