8) Consider the tetrasaccharide stachyose drawn below. Stachyose is found in white jasmine, soybeans, and lentils. Because humans cannot digest it, its consumption causes flatulence. HO How ОН OH stachyose OH HO HO OH HO OH OH OH OH «ОН a. Label all glycoside bonds. b. Classify each glycosidic linkage as a or ẞ and use numbers to designate its location between two rings (e.g., 1-4-3). c. What products are formed when stachyose is hydrolyzed with H,O"? d. Is stachyose a reducing sugar? e. What product is formed when stachyose is treated with excess CHI, Ag₂O? f. What products are formed when the product in (e) is treated with H₂O"?

8) Consider the tetrasaccharide stachyose drawn below. Stachyose is found in white jasmine, soybeans, and lentils. Because humans cannot digest it, its consumption causes flatulence. HO How ОН OH stachyose OH HO HO OH HO OH OH OH OH «ОН a. Label all glycoside bonds. b. Classify each glycosidic linkage as a or ẞ and use numbers to designate its location between two rings (e.g., 1-4-3). c. What products are formed when stachyose is hydrolyzed with H,O"? d. Is stachyose a reducing sugar? e. What product is formed when stachyose is treated with excess CHI, Ag₂O? f. What products are formed when the product in (e) is treated with H₂O"?

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Similar questions

Although the first two carbons of fructose and glucose are identical in structure to DHAP and GADP (from glycolysis), DHAP and GADP equilibriate on their in solution to favor the ketone over the aldehyde, while fructose and glucose do not. Why? a)The larger size of the molecule sterically hinders the isomerization b)The larger sugars have more OH groups which hydrogen bond and disrupt isomerization c)The larger sugars cyclize, and there is no carbonyl to isomerize in the cyclic form d)The larger sugars cyclize, and in the cyclic form the hydrogen bonding is very strong e)The larger sugars are less soluble in water than the smaller sugars
1. At pH 7, the net charge of lysine is A. -2 В. -1 С. О D. +1 Е. +2 2. All 20 amino acids have A. one chiral carbon В. one a-carbon C. one carboxyl group D. ionizable R group E. neutral charge at physiological pH 3. The a helix structure of a polypeptide is maintained by A. peptide bonds B. van der Waal's force C. hydrogen bonds D. ionic bonds E. disulphide bonds 4. Which side chain of the following amino acid is deprotonated at pH 9? A. Methionine B. Alanine C. Isoleucine D. Histidine Е. Тyгosine 5. How many chiral carbons are in the following sugar? А. 1 В. 2 С. 3 D. 4 Е. 5
Fill in ..... (1) the complete systematic names for sugars A, B and C (remember to you pyranosyl or furanosyl because these are not the terminal sugar). (2) The appropriate descriptor of the glycosidic bonds where appropriate/necessary. (3) Draw the missing sugars as indicated onto the given diagram. HO OH GED A HO OH a-L-psicofuranose (1➜6)- (1➜4)- a-D-idopyranose HO OH B OH OH OH OH SUGAR A SUGAR B SUGAR C
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4. Which molecules represent a non-bonding sugar?
16.
Could you explain step by step each answer and how to get there?
Which bond in maltose will be hydrolysed by starch? OH DE HO" B '"OH ОН HO Select one: O B O D O A
19. (a) Use Figure 1 to draw the cyclic ẞ-form of the monosaccharide shown below. CHO CH₂OH HO-CH HO-C-H H-C-OH H-C-OH CH₂OH H Z Figure 1 (b) Draw the enantiomer of the monosaccharide shown below. Is the enantiomer a D-sugar or an L-sugar? CHO HO–CH H-C-OH HO-C—H H-C-OH CH₂OH
3) After watching the video convert the monosaccharides from a Fischer to a Haworth Projection. a) Convert D-mannose to its a-pyranose. CHO HOH HO H H OH -OH CH₂OH PH 3 D-mannose b) Convert L-galactose to its B-pyranose. H 1 CHO HOH OH H-OH HO-H 6CH₂OH L-galactose