Organic Chemistry - MasteringChemistry
7th Edition
ISBN: 9780321867148
Author: Bruice
Publisher: PEARSON
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Chapter 24.6, Problem 19P
Interpretation Introduction
Interpretation:
The enzyme catalysed reaction and the names of the required coenzymes should be determined.
Concept introduction:
In an enzyme catalysed reaction that requires coenzymes
Biotin (vitamin H) is the coenzyme required by enzymes that catalyse the carboxylation of a carbon adjacent to carbonyl group.
Coenzymes
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① H+ + HCO3─ + Pi → Carboxyphosphate + H2O ∆G0’ =+19.7 kJ mol-1
② ATP + H2O → ADP + Pi + H+ ∆G0’ = ─30.5 kJ mol-1
③ Carboxyphosphate + pyruvate → oxaloacetate + Pi ∆G0’ = ??? kJ mol-1
④ Overall reaction:
ATP + HCO3─ + pyruvate → oxaloacetate + ADP + Pi ∆G0’ = ─2.1 kJ mol-1
a) Use reactions ①, ② and overall reaction ④ to calculate the ∆G0’ for the formation of oxaloacetate from pyruvate and carboxyphosphate (reaction ③ above).
Use reactions ①, ② and overall reaction ④ to calculate the ∆G0’ for the formation of oxaloacetate from pyruvate and carboxyphosphate (reaction ③ above).
b) Now calculate ∆G0’ for the formation of oxaloacetate from pyruvate and bicarbonate in the absence of ATP.
c) Explain the difference in your answers to parts a and b.
(i) Deficiency of which vitamin causes rickets?(ii) Give an example for each of fibrous protein and globular protein.(iii) Write the product formed on reaction of D-glucose with Br2 water.
Report Table CHO.15: Hydrolysis Conclusions for Starch
Iodine test observation
Conclusion for Iodine test
Benedict's test observation
Conclusion for Benedict's test
Starch + H2O(negative control)
Blue to black solution
Choose...
A. Amylose presnet
B. Amylose not present
Blue solution
Choose...
A. Reducing sugars not presnet
B. Reducing sugars presnet
Starch + HCl(potential hydrolysis)
more blue-black compared to starch+water
Choose...
A. More amylose presnet
B. Less amylose presnet
C. No change
no longer blue compared to starch+water
Choose...
A. More reducing sugar present
B. Less reducing sugar present
C. No change
Did hydrolysis of starch occur in the presence of acid?
A. yes
B. no
Give a summary of your results for the hydrolysis of disaccharides and polysaccharides. In your own words, explain why you saw these results.
Chapter 24 Solutions
Organic Chemistry - MasteringChemistry
Ch. 24.1 - Prob. 2PCh. 24.1 - Prob. 3PCh. 24.2 - How many conjugated double bonds are there in a....Ch. 24.2 - Instead of adding to the 4a position and...Ch. 24.2 - Prob. 7PCh. 24.3 - Prob. 8PCh. 24.3 - Acetolactate synthase is another TPP-requiring...Ch. 24.3 - Acetolactate synthase transfers the acyl group of...Ch. 24.5 - Prob. 12PCh. 24.5 - The enzyme that catalyzes the C C bond cleavage...
Ch. 24.5 - Propose a mechanism for the ,-elimination reaction...Ch. 24.5 - Which compound is more easily decarboxylated?Ch. 24.5 - Explain why the ability of PLP to catalyze an...Ch. 24.5 - Explain why the ability of PLP to catalyze an...Ch. 24.6 - Ethanolamine ammonia lyase, a coenzyme...Ch. 24.6 - Prob. 19PCh. 24.7 - How do the structure of tetrahydrofolate and...Ch. 24.7 - What is the source of the methyl group in...Ch. 24.8 - Thiols such as ethanethiol and propanethiol can be...Ch. 24 - How does the metal ion in carboxypeptidase A...Ch. 24 - Prob. 23PCh. 24 - Prob. 24PCh. 24 - Prob. 25PCh. 24 - S-Adenosylmethionine (SAM) is formed from the...Ch. 24 - Prob. 27PCh. 24 - What acyl groups have we seen transferred by...Ch. 24 - Propose a mechanism for the following reaction:Ch. 24 - When transaminated, the three branched-chain amino...Ch. 24 - Draw the products of the following reaction, where...Ch. 24 - When UMP is dissolved in T2O, exchange of T for H...Ch. 24 - Dehydratase is a PLP-requiring enzyme that...Ch. 24 - In addition to the reaction mentioned in Section...Ch. 24 - PLP can catalyze both ,-elimination reactions...Ch. 24 - The glycine cleavage system is a group of four...Ch. 24 - Prob. 37PCh. 24 - FADH2 reduces , -unsaturated thioesters to...
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- Phospholipase C was shown to hydrolyze phoshatidylethanolamine and PIP2 with the same efficiency. Both lipids contain the same fatty acyl residues. Will the hydrolysis products of PE and PIP2 have the same effect on protein kinase C? Explain answer!arrow_forwardDraw two possible epimers of D-erythrose. Name each of these compounds using Figure 28.4.Figure 28.4: The family of D-aldoses having three to six carbon atomsarrow_forwardWhich amino acids are converted to oxaloacetate? Select all that apply. A. arginine B. serine C. asparagine D. glutamine E. aspartatearrow_forward
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