Concept explainers
(a1)
To determine: The relation between MRS and ∆G˚ of the binding reaction.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and interaction with taste bud receptors. Molar relative sweetness (MRS) is the measure of sweetness of the compound relative to sweetness of sucrose.
(a2)
To determine: Whether the more negative value of ∆G˚ will correspond to a higher or lower MRS.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet less. The sweetness is related to their structures and taste bud receptors on which the compounds bind. Molar relative sweetness (MRS) is the measure of sweetness of the compound relative to sweetness of sucrose.
(b)
To explain: The uses of predicting the sweetness of molecules by computer model instead of a human or animal-based taste assay.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and taste bud receptors. The assay that requires less time to generate valuable result would be convenient and desirable.
(c)
To determine: The AH-B groups in each of the given molecules when the length of a typical single bond is about 0.15 nm
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and taste bud receptors.
(d)
To determine: The two objections to the statement that molecules containing an AH-B structure will taste sweet are to be determined.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and taste bud receptors.
(e)
To determine: The two molecules out of given molecules that can be used to explain the difference in MRS and ∆G˚ and their relation to AH-B model.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and taste bud receptors. Molar relative sweetness (MRS) is the measure of sweetness of the compound relative to sweetness of sucrose.
(f)
To determine: The two examples that can be used to argue the AH-B model is unable to explain the observed differences in sweetness.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and taste bud receptors. Molar relative sweetness (MRS) is the measure of sweetness of the compound relative to sweetness of sucrose.
(g)
To determine: Whether need to test the model against a different set of molecules from the set it was trained on.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and taste bud receptors.
(h)
To determine: The resulting error in MRS values as it has found that the predicted ∆G˚ values for the test set differed from the actual values by, on average, 1.3 kcal/mol.
Introduction: Various compounds taste sweet. Some of them sweet more, while some of them sweet lesser. The sweetness is related to their structures and taste bud receptors. Molar relative sweetness (MRS) is the measure of sweetness of the compound relative to sweetness of sucrose.
Want to see the full answer?
Check out a sample textbook solutionChapter 1 Solutions
Lehninger Principles of Biochemistry
- Calculate the number of ATP produced from oxidation of 1 molecule of glucosearrow_forwardExample 1: 1. Suppose an enzyme (MW = 5,000 g/mole) has a concentration of 0.05 mg/L. If the kcat is 1 x 10 s, what is the theoretical maximum reaction velocity for the enzyme? A) 1050 µM/s. B) 100 µM/s. C) 150 μM/s. D) 105 μM/s.arrow_forwardIn 1956, E. P. Kennedy and S. B. Weiss published their study of membrane lipid phosphatidylcholine (lecithin) synthesis in rat liver. Their hypothesis was that phosphocholine joined with some cellular component to yield lecithin. In an earlier experiment, incubating 32 P-labeled phosphocholine at physiological temperature (37 °C) with broken cells from rat liver yielded labeled lecithin. This became their assay for the enzymes involved in lecithin synthesis. Determine the optimal pH for this enzyme and characterize the enzyme activity at different pH values. -O-P-O-CH2-CH₁₂-N(CH3)3 Phosphocholine H₂C-O-C-R HC-O-C-R2 + + + Cell fraction + ? HC-O-P-O-CH₁₂-CH₂-N(CH), O Phosphatidylcholine The researchers then centrifuged the broken cell preparation to separate the membranes from the soluble proteins. They tested three preparations: whole extract, membranes, and soluble proteins. Table 1 summarizes the results. Table 1: Cell fraction requirement for incorporation of 32p-phosphocholine into…arrow_forward
- Researchers isolated an unknown substance, X, from rabbit muscle. They determined its structure from the following observations and experiments. (a) Qualitative analysis showed that X was composed entirely of C, H, and O. A weighed sample of X was completely oxidized and the H2O and CO2 produced were measured. This quantitative analysis revealed that X contained 40.00% C, 6.71% H, and 53.29% O by weight. (b) The molecular mass of X, as determined by mass spectrometry, was 90.00 atomic mass units (u). (c) Infrared spectroscopy showed that X contained one double bond. (d) X dissolved readily in water, and the solution demonstrated optical activity when tested in a polarimeter. (e) The aqueous solution of X is acidic. What is the empirical formula of X?arrow_forwardShow work. don't give Ai generated solution....give correct solutionarrow_forwardBiochemistry What is the process of "transamination" in either the muscles or the liver, that involves keto acid or glutamic acid? Please explain how the steps work. Thank you!arrow_forward
- Biochemistry Please help. Thank you What is the importance of glutamic acid in the metabolism of nitrogen from amino acids? (we know therole; it’s used to remove the nitrogen from amino acids so that the remaining carbon skeleton can bebroken down by the “usual” pathways, but what is the important, unique role that only glutamicacid/glutamate can do?)arrow_forwardBiochemistry Please help. Thank you When carbamyl phosphate is joined to L-ornathine, where does the energy for the reaction come from?arrow_forwardBiochemistry Question Please help. Thank you What is the function of glutamate dehydrogenase?arrow_forward
- Biochemistry Question Please help. Thank you How and why does a high protein diet affect the enzymes of the urea cycle?arrow_forwardBiochemistry What is the importance of the glucose-alanine cycle?arrow_forwardBiochemistry Assuming 2.5 molecules of ATP per oxidation of NADH/(H+) and 1.5molecules of ATP per oxidation of FADH2, how many ATP are produced per molecule of pyruvate? Please help. Thank youarrow_forward
- BiochemistryBiochemistryISBN:9781319114671Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.Publisher:W. H. FreemanLehninger Principles of BiochemistryBiochemistryISBN:9781464126116Author:David L. Nelson, Michael M. CoxPublisher:W. H. FreemanFundamentals of Biochemistry: Life at the Molecul...BiochemistryISBN:9781118918401Author:Donald Voet, Judith G. Voet, Charlotte W. PrattPublisher:WILEY
- BiochemistryBiochemistryISBN:9781305961135Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougalPublisher:Cengage LearningBiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage LearningFundamentals of General, Organic, and Biological ...BiochemistryISBN:9780134015187Author:John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. PetersonPublisher:PEARSON