Concept explainers
(a)
Interpretation:
The structures of two monomethyl esters of
Concept introduction:
The chemical compounds in which carbon is bonded with the acidic and basic group along with hydrocarbon side chain are known as amino acids. The amino acids are classified into acidic, basic, polar, non-polar, essential, and non-essential categories. The three-word abbreviation or one-word abbreviation is used for amino acids.
(b)
Interpretation:
The reason as to why two monomethyl esters of
Concept introduction:
Cation-exchange chromatography is a type of separation technique in which anion resin is used in the chromatography column. This anion resin interacts with the cation part of the sample and retards their follow in the column. The neutral compound follows easily on this chromatography column.
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EBK ORGANIC CHEMISTRY STUDY GUIDE AND S
- (a) What is the difference between the hormones progesterone and testosterone? (b) Draw the structure of a a steroid nucleus. (c) Give the products obtained from complete base hydrolysis in the following reaction: O || CH,−O−C−(CH2)14–CH3 O CH–0–C−(CH2)14—CH3 + 3 NaOH O CH,−0–C−(CH2)14–CH3arrow_forwardDraw the product that valine forms when it reacts with di-tert-butyl dicarbonate and triethylamine followed by an aqueous acid wash. O • You do not have to consider stereochemistry. • Do not draw organic or inorganic by-products. • Draw the product in neutral form unless conditions are clearly designed to give an ionic product. • Include cationic counter-ions, e.g., Na+ in your answer, but draw them in their own sketcher. • Do not include anionic counter-ions, e.g., I, in your answer. 90.0 ChemDoodle /n [Farrow_forward(b) Describe how the charge of some amino groups in a protein might differ at pH 9.0 and pH 5.0. the charge on the amino group will differ at pH 5 and pH 9 which will depend on the pKa of the amino acid. (c) Describe how the charge of some carboxyl groups in a protein might differ at pH 9.0 and pH 5.0. charge on carboxyl group will differ at pH 5 and pH 9 which will depend on the pKa of the amino acid. (d) Given your answers to parts (b) and (c), what kind of intramolecular interactions in beta-galactosidase are most likely to be affected by a change in pH from 9.0 to 5.0? (e) Could the interactions you mention in part (d) affect the catalytic activity of beta-galactosidase?arrow_forward
- (a) The isoelectric point (pI) of phenylalanine is pH 5.5. Draw the structure of the major form of phenylalanine at pHvalues of 1, 5.5, and 11.(b) The isoelectric point of histidine is pH 7.6. Draw the structures of the major forms of histidine at pH values of 1, 4,7.6, and 11. Explain why the nitrogen in the histidine ring is a weaker base than the a-amino group.(c) The isoelectric point of glutamic acid is pH 3.2. Draw the structures of the major forms of glutamic acid at pH valuesof 1, 3.2, 7, and 11. Explain why the side-chain carboxylic acid is a weaker acid than the acid group next to thea-carbon atomarrow_forward1. Write the equation of the reaction of oxidative deamination of alanine (in vitro). Specify the conditions of its passage. Name the reaction product. 2. Which of the following formulas of aspartic acid will prevail at pH = 12? Write the equation of dissociation of this acid. HOOC-CH2-CH-COO HOOC-CH2-CH-COOH *NH3 *NH3 1) HOOC-CH2-CH-COO OOC-CH₂-CH-COO™ NH₂ NH₂ 3) 2)arrow_forwardThe pKaa of the conjugate acid of guanidine is 13.6, making it one of the strongest neutral organic bases. Offer an explanation.arrow_forward
- Write the structures of the monomers used for getting the following polymers:(a) Teflon(b) Melamine-formaldehyde polymer(c) Neoprenearrow_forward(a) (i) Write an equation showing the formation of a triacylglycerol (Molecule A) thatcontains equimolar amounts of myristoleic, capric and linolenic acids. Myristoleic acid: CH3(CH2)5CH=CH(CH2)7CO2HCapric acid: CH3(CH2)8CO2HLinolenic acid: CH3CH2(CH=CHCH2)3(CH2)6CO2H (ii) Draw the structure of the partially hydrogenated product of Molecule A.arrow_forwardHow can I calculate polycarboxylate(liquid) density?arrow_forward
- Which of the following chemical reactions could be used to distinguish between a polyunsaturated vegetable oil and apetroleum oil containing a mixture of saturated and unsaturated hydrocarbons? Explain your reasoning.(a) addition of bromine in CCl4 (b) hydrogenation(c) saponification (d) ozonolysisarrow_forwarddraw out the true structures of aspartic acid at (a) pH = 1.52, (b) = 7.35, (c) pH = 9.95arrow_forwardA naturally occurring amino acid such as alanine has a group that is a carboxylic acid and a group that is a protonated amine. a. If the pKa value of a carboxylic acid such as acetic acid is about 5 (see Table 2.1), then why is the pKa value of the carboxylic acid group of alanine so much lower? b. Draw the structure of alanine in a solution at pH = 0. c. Draw the structure of alanine in a solution at physiological pH (pH 7.4). d. Draw the structure of alanine in a solution at pH = 12. e. Is there a pH at which alanine is uncharged (that is, neither group has a charge)? f. At what pH does alanine have no net charge (that is, the amount of negative charge is the same as the amount of positive charge)?arrow_forward
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