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- 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"?2. A. hand-draw the chemical structures of dipalmitoyl phosphatidyl choline, DPPC (also known as lecithin, although lecithin is a more general name and can refer to other chemical structures). B. Where is DPPC found in a cell? C. Is this a lipid, carbohydrate, protein or nucleic acid? Do not leave any "R" groups in the structure that you draw.1. Is the disaccharide reducing? Yes or no and why. 2. Will the disachharide react positively with benedicts reagent? Yes or No. 3. What is the specific glycosidic linkage of the disacchride? A. alpha-1,4 glycosidic linkage B. beta-1,3 glycosidic linkage C. alpha-1,3 glycosidic linkage D. beta-1,4 glycosidic linkage
- 15. Rank the solubility of the following fatty acids in water. A. C<E<B<D<F<A B. A<F<D<B<E<C C. C<E<B<F<D<A D. A<D<F<B<E<C 16. Using the same information in no. 15, rank the solubility of the fatty acids in hexane.* A. C<E<B<D<F<A B. A<F<D<B<E<C C. C<E<B<F<D<A D. A<D<F<B<E<C4. Which among the given peptides will form hydrogen bond with another similar peptide chain? i. ASTGHASTGH ii. GASTHASTCH A. i B. ii C. i & iiAn octapeptide composed of four repeating glycylalanyl units has ___. A. one free amino group on the glycyl residue and one free carboxyl group on a alanyl residue B. two free carboxyl groups, both on the glycyl residues C. two free amino groups, both on alanyl residue she D. one free amino group on the alanyl residue and one free carboxyl group on a glycyl residue
- 1. What biological molecule are required in the synthesis of protein( choose all that apply)? - phosphate ester - fatty acid (s) - alcohol - glycerol - amino acids 2. ATP is generated during A. Aldehyde reduction B. Alkene hydration C. Acetal synthesis D. Polysaccharide hydrolysis 3. What compound( biological classification) would be the result of protein complete hydrolysis in the mouth? A. Fatty acid and glycerol B. Monosaccharides C. Amino acids D. Disaccharide 4. The hydrophobic/ hydrophilic interaction are present in which protein structure level (s) (choose all that apply) ? - secondary - primary - tertiary -quaternary 5. Which protein structural level is/ are affected by the addition of an organic solvent isopropanol? A. Secondary B. Tertiary C. All are affected D. QuaternaryO d. The nucleus O e. Chitin Which type of bonds links the monomers that make up cellulose microfibrils Select one: O a. lonic bonds O b. Hydrogen bonds O c. Glycosidic linkage between B glucose O d. Ester linkage O e. Glycosidic linkage between a glucose Phospholipids in water exist as an aggregate called4. Draw structures for the following fatty acids: a. 16:1 or palmitoleic or 9-Hexadecanoic acid b. 18:3*2 a-linoleic acid or 9,12,15 Octadecatrienoic acid 5. Draw and name a typical triacylglycerol. 6. Explain why the flip-flop rate of phospholipids in biological membranes is far greater than in artificial lipid membranes.
- What is a glycoconjugate? Choose all that apply. a. A glycoconjugate is a glycolipid or a glycoprotein b. A glycoconjugate is a term that is used to describe the addition of sugars to other biomolecules c. A glycoconjugate is a term that is used to describe the addition of sugars to other biomolecules 3. What is the glycocalyx? a. The glycocalyx describes the various symbols used to designate individual monosaccharides b. The glycocalyx is the complete ensemble of glycoconjugates and glycans at the cell surface c. The glycocalyx is a glycan that is made synthetically d. None of these are correct e. All of these are correct18. D-galactose is soluble in water because of the interaction of the –OH groups of the monosaccharide and watermolecules. What type of intermolecular bond is established between the sugar and water?A. London Dispersion forcesB. Covalent bondC. Hydrogen bondD. Ion-dipole interaction 19. Some disaccharides are non-reducing because they have no free anomeric carbons. Based on this information, whichof the following disaccharides is non-reducing?A. glucopyranosyl α-(1 →4) glucopyranosideB. galactopyranosyl β-(1 → 4) glucopyranosideC. glucopyranosyl α-(1 → 2) fructopyranosideD. glucopyranosyl β-(1 → 3) glucopyranoside2. The diagram below shows the chemical structure of a lipid molecule. A B Is it a sphingophospholipid or glycerophospholipid? b. What are the terms used to describe the two types of fatty acids in this molecule? а. с. What is the name of the functional group highlighted in the box in the diagram? d. If fatty acid B is metabolized, how many rounds of b-oxidation will it go through? What is the name of molecule released from b-oxidation? e. Name the fatty acid A using n-system and delta system. f. What type of configuration of double bond is shown in fatty acid A?