The visible spectrum of B-carotene (C40oHs, MW 536.89, the orange pigment incarrots) dissolved in hexane shows intense absorption maxima at 463 nm and494 nm, both in the blue-green region. Because light of these wavelengths isabsorbed by B-carotene, we perceive the color of this compound as that of thecomplement to blue-green, namely red-orange.B-CaroteneAmax 463 nm (log e 5.10); 494 nm (log e 4.77)Calculate the concentration in milligrams per milliliter of B-carotene that givesan absorbance of 1.8 at 463 nm.

The β- carotene is the orange pigment that causes colouration of the colouration of fruits and…

Answered: The visible spectrum of B-carotene…

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter21: Photosynthesis

Section: Chapter Questions

Problem 13P

See similar textbooks

Similar questions

Assume that the reaction Arabinose +Pi <> Arabinose-6-P has a delta G of +13.0 kJ/mol and the reaction XTP <> XDP + Pi has a delta G of -25.7 kJ/mol. Calculate the delta G for the combined reaction Arabinose + XTP <> Arabinose-6-P + ADP, in kJ/mol to four significant figures.
What functional unit vibration would you expect to see on an IR spectrum and about where would it absorb (1/cm) if there were a significant concentration of the isopentyl alcohol reactant in an impure isopentyl acetate sample made by our procedure that would distinguish it from isopentyl acetate?
Acetocholinesterase is an enzyme possessing a single active site that metabolizesacetylcholine with a turn over number of 1.4 x 10^4s-1. How many grams of acetylcholine(molecular formula C7NO2H16+) will 2.16 x 10^-6 g acetocholinesterase metabolize in 60minutes? (The enzyme’s molecular mass is 4.2 x 10^4 g/mol).
The breakdown of a complex carbohydrate into its monomeric unit can be described as an enzyme-catalyzed reaction that has a deltaG(∆G) of -90kcal/mol. Suppose you were to add triple the amount of enzyme into this reaction - what would be the ∆G of this reaction?
Given the following choices,a. what is the structure of the product of the reaction catalysed by ACAT?b. structure of the product produced from the reaction catalysed by phospolipase A2?c. general structure of TAGd. structure of glycerol
Glucose-1-phosphate has a ΔG°′ value of −20.9 kJ/mol, whereas that for glucose-6-phosphate is −12.5 kJ/mol. After reviewing the molecular structures of these compounds, explain why there is such a difference in these values.
If you were to determine the P/O ratio for oxidation of α-ketoglutarate,you would probably include some malonate in your reaction system. Why?Under these conditions, what P/O ratio would you expect to observe?
Sphingosine-1-phosphate (S1P) is important for cell survival. The synthesis of S1P from sphingosine and ATP is catalyzed by the enzyme sphingosine kinase. An understanding of the kinetics of the sphingosine kinase reaction may be important in the development of drugs to treat cancer. The velocity of the sphingosine kinase reaction was measured in the presence and absence of threo-sphingosine, a stereoisomer of sphingosine that inhibits the enzyme. The results are shown below. Construct a Lineweaver–Burk plot to answer the following questions: (a) What are the apparent KM and Vmax values in the presence and absence of the inhibitor? (b) What kind of an inhibitor is threo-sphingosine? Explain.
Sphingosine-1-phosphate (S1P) is important for cell survival. The synthesis of S1P from sphingosine and ATP is catalyzed by the enzyme sphingosine kinase. An understanding of the kinetics of the sphingosine kinase reaction may be important in the development of drugs to treat cancer. The velocity of the sphingosine kinase reaction was measured in the presence and absence of threo-sphingosine, a stereoisomer of sphingosine that inhibits the enzyme. The results are shown below. Construct a Lineweaver-Burk plot to answer the following questions: (a) What are the apparent KM and Vmax values in the presence and absence of the inhibitor? (b) What kind of an inhibitor is threo-sphingosine? Explain.
Calculate the standard reduction of 3-phosphoglycerate using val ues from your book, and compare the reduction potential to others tabulated in the book.
A 0.0284 M aqueous solution of lactic acid, HC3H5O3, a substance that accumulates in the blood and muscles during physical activity, is found to be 6.7% ionized. Determine the value of Ka for lactic acid.
With respect to the parent compound, explain in detail how modifying the rings shown as A, B, C, D and E in morphine can affect the biological activity associated with the molecule

SEE MORE QUESTIONS

Recommended textbooks for you

Biochemistry

ISBN:

9781305577206

Author:

Reginald H. Garrett, Charles M. Grisham

Publisher:

Cengage Learning

Biomedical Instrumentation Systems

Chemistry

ISBN:

9781133478294

Author:

Chatterjee

Publisher:

Cengage

Biochemistry

ISBN:

9781305577206

Author:

Reginald H. Garrett, Charles M. Grisham

Publisher:

Cengage Learning

Biomedical Instrumentation Systems

Chemistry

ISBN:

9781133478294

Author:

Chatterjee

Publisher:

Cengage

SEE MORE TEXTBOOKS