The activity of a pore-forming membrane protein, PorinA1, was tested in different lipid bilayers at 60 °C. Each bilayer is composed of a single type of phosphoglyceride. The four different phosphoglycerides usedare shown in the table below together with the corresponding average hydrophobic thickness of the bilayer formed:PhosphoglycerideBilayer hydrophobic thickness ( A)Dilauroylphosphatidylcholine (DLPC)30.7Dimyristoylphosphatidylcholine (DMPC)34.2Dipalmitoylphosphatidylcholine (DPPC)38.1Distearoylphosphatidylcholine (DSPC)42.2PorinA1 is found to have the greatest activity when embedded in DPPC lipid bilayers. Which of the following values (in A) would be the best estimate for the length of the hydrophobic region of PorinA1?O 38O 51O 31O 42O 38

Biological membranes are lipid bilayers, which provide structure to the cells. Biological membranes…

Answered: The activity of a pore-forming membrane…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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A spherical cell with the diameter of 10uMhas a protein concentration of 20 mg/ml. Determine the number of protein molecules within the cell if the molecular weight of an average protein is 50,000 daltons (g/mol). Recall that Avogadro's number is N₁ = 6.0221367×1023 molecules/mol.
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Lipid bilayers form spontaneously in a process driven by the hydrophobic effect. Explain how the hydrophobic effect drives bilayer formation from individual lipids in an aqueous environment. Describe how the physical properties of the lipid bilayer are determined by the chemical properties of the membrane lipid components. Diagrams are encouraged for both parts of the question.
Why methylene blue, a basic dye, can be used to stain cytoplasm, a basic structure? Why cytoplasm is basic and at the same time negatively charged? I am confused with the terms "basic dye" and "acidic dye". Is it true that a basic dye is positively charged? If so, why is cytoplasm which is negatively charged called basic materials? Could you please explain more on these?
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