The number of phospholipid molecules in 1µm 2 of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å 2 of surface area. Concept introduction: Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

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Answer 1

Question

Chapter 12, Problem 1P

Interpretation Introduction

Interpretation:

The number of phospholipid molecules in 1µm² of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å² of surface area.

Concept introduction:

Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Expert Solution & Answer

Answer to Problem 1P

There are 2.86×106 phospholipid molecules in 1µm²of the bilayer membrane.

Explanation of Solution

Lipid bilayers are two-dimensional fluids which are a universal basis of the cell membrane.

Membrane lipids and proteins move along the membrane.

Lateral diffusion for the phospholipids is very rapid.

Phospholipid moves by 1m² in one sec=molecule diffuses by 2m in one sec.

Molecule travels from one end of the bacterial cell to another in one sec.

Human red blood cells can be passed in 12 sec.

Each leaflet of the bilayer contains 1.43×106 molecules.

There are two leaflets in the bilayer membrane.

Thus, in the bilayer membrane, the number of molecules are:

= 2×1.43×106

= 2.86×106

Hence, there are 2.86×106 molecules in the 1µm² of the bilayer membrane.

Conclusion

The phospholipid in two layers called a phospholipid bilayer. Each leaflet of the membrane has 1.43×106 molecule hence, the bilayer membrane consists of 2.86×106 molecules.

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In 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…

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?

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Answer 2

Question

Chapter 12, Problem 1P

Interpretation Introduction

Interpretation:

The number of phospholipid molecules in 1µm² of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å² of surface area.

Concept introduction:

Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Expert Solution & Answer

Answer to Problem 1P

There are 2.86×106 phospholipid molecules in 1µm²of the bilayer membrane.

Explanation of Solution

Lipid bilayers are two-dimensional fluids which are a universal basis of the cell membrane.

Membrane lipids and proteins move along the membrane.

Lateral diffusion for the phospholipids is very rapid.

Phospholipid moves by 1m² in one sec=molecule diffuses by 2m in one sec.

Molecule travels from one end of the bacterial cell to another in one sec.

Human red blood cells can be passed in 12 sec.

Each leaflet of the bilayer contains 1.43×106 molecules.

There are two leaflets in the bilayer membrane.

Thus, in the bilayer membrane, the number of molecules are:

= 2×1.43×106

= 2.86×106

Hence, there are 2.86×106 molecules in the 1µm² of the bilayer membrane.

Conclusion

The phospholipid in two layers called a phospholipid bilayer. Each leaflet of the membrane has 1.43×106 molecule hence, the bilayer membrane consists of 2.86×106 molecules.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Question

Chapter 12, Problem 1P

Interpretation Introduction

Interpretation:

The number of phospholipid molecules in 1µm² of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å² of surface area.

Concept introduction:

Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Expert Solution & Answer

Answer to Problem 1P

There are 2.86×106 phospholipid molecules in 1µm²of the bilayer membrane.

Explanation of Solution

Lipid bilayers are two-dimensional fluids which are a universal basis of the cell membrane.

Membrane lipids and proteins move along the membrane.

Lateral diffusion for the phospholipids is very rapid.

Phospholipid moves by 1m² in one sec=molecule diffuses by 2m in one sec.

Molecule travels from one end of the bacterial cell to another in one sec.

Human red blood cells can be passed in 12 sec.

Each leaflet of the bilayer contains 1.43×106 molecules.

There are two leaflets in the bilayer membrane.

Thus, in the bilayer membrane, the number of molecules are:

= 2×1.43×106

= 2.86×106

Hence, there are 2.86×106 molecules in the 1µm² of the bilayer membrane.

Conclusion

The phospholipid in two layers called a phospholipid bilayer. Each leaflet of the membrane has 1.43×106 molecule hence, the bilayer membrane consists of 2.86×106 molecules.

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Answer 4

Question

Chapter 12, Problem 1P

Interpretation Introduction

Interpretation:

The number of phospholipid molecules in 1µm² of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å² of surface area.

Concept introduction:

Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Expert Solution & Answer

Answer to Problem 1P

There are 2.86×106 phospholipid molecules in 1µm²of the bilayer membrane.

Explanation of Solution

Lipid bilayers are two-dimensional fluids which are a universal basis of the cell membrane.

Membrane lipids and proteins move along the membrane.

Lateral diffusion for the phospholipids is very rapid.

Phospholipid moves by 1m² in one sec=molecule diffuses by 2m in one sec.

Molecule travels from one end of the bacterial cell to another in one sec.

Human red blood cells can be passed in 12 sec.

Each leaflet of the bilayer contains 1.43×106 molecules.

There are two leaflets in the bilayer membrane.

Thus, in the bilayer membrane, the number of molecules are:

= 2×1.43×106

= 2.86×106

Hence, there are 2.86×106 molecules in the 1µm² of the bilayer membrane.

Conclusion

The phospholipid in two layers called a phospholipid bilayer. Each leaflet of the membrane has 1.43×106 molecule hence, the bilayer membrane consists of 2.86×106 molecules.

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Answer 5

Chapter 12, Problem 1P

Interpretation Introduction

Interpretation:

The number of phospholipid molecules in 1µm² of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å² of surface area.

Concept introduction:

Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Expert Solution & Answer

Answer to Problem 1P

There are 2.86×106 phospholipid molecules in 1µm²of the bilayer membrane.

Explanation of Solution

Lipid bilayers are two-dimensional fluids which are a universal basis of the cell membrane.

Membrane lipids and proteins move along the membrane.

Lateral diffusion for the phospholipids is very rapid.

Phospholipid moves by 1m² in one sec=molecule diffuses by 2m in one sec.

Molecule travels from one end of the bacterial cell to another in one sec.

Human red blood cells can be passed in 12 sec.

Each leaflet of the bilayer contains 1.43×106 molecules.

There are two leaflets in the bilayer membrane.

Thus, in the bilayer membrane, the number of molecules are:

= 2×1.43×106

= 2.86×106

Hence, there are 2.86×106 molecules in the 1µm² of the bilayer membrane.

Conclusion

The phospholipid in two layers called a phospholipid bilayer. Each leaflet of the membrane has 1.43×106 molecule hence, the bilayer membrane consists of 2.86×106 molecules.

Answer 6

Chapter 12, Problem 1P

Interpretation Introduction

Interpretation:

The number of phospholipid molecules in 1µm² of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å² of surface area.

Concept introduction:

Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Expert Solution & Answer

Answer to Problem 1P

There are 2.86×106 phospholipid molecules in 1µm²of the bilayer membrane.

Explanation of Solution

Lipid bilayers are two-dimensional fluids which are a universal basis of the cell membrane.

Membrane lipids and proteins move along the membrane.

Lateral diffusion for the phospholipids is very rapid.

Phospholipid moves by 1m² in one sec=molecule diffuses by 2m in one sec.

Molecule travels from one end of the bacterial cell to another in one sec.

Human red blood cells can be passed in 12 sec.

Each leaflet of the bilayer contains 1.43×106 molecules.

There are two leaflets in the bilayer membrane.

Thus, in the bilayer membrane, the number of molecules are:

= 2×1.43×106

= 2.86×106

Hence, there are 2.86×106 molecules in the 1µm² of the bilayer membrane.

Conclusion

The phospholipid in two layers called a phospholipid bilayer. Each leaflet of the membrane has 1.43×106 molecule hence, the bilayer membrane consists of 2.86×106 molecules.

Answer 7

Chapter 12, Problem 1P

Interpretation Introduction

Interpretation:

The number of phospholipid molecules in 1µm² of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å² of surface area.

Concept introduction:

Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Answer 8

Expert Solution & Answer

Answer to Problem 1P

There are 2.86×106 phospholipid molecules in 1µm²of the bilayer membrane.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Lipid bilayers are two-dimensional fluids which are a universal basis of the cell membrane.

Membrane lipids and proteins move along the membrane.

Lateral diffusion for the phospholipids is very rapid.

Phospholipid moves by 1m² in one sec=molecule diffuses by 2m in one sec.

Molecule travels from one end of the bacterial cell to another in one sec.

Human red blood cells can be passed in 12 sec.

Each leaflet of the bilayer contains 1.43×106 molecules.

There are two leaflets in the bilayer membrane.

Thus, in the bilayer membrane, the number of molecules are:

= 2×1.43×106

= 2.86×106

Hence, there are 2.86×106 molecules in the 1µm² of the bilayer membrane.

Answer 12

Conclusion

The phospholipid in two layers called a phospholipid bilayer. Each leaflet of the membrane has 1.43×106 molecule hence, the bilayer membrane consists of 2.86×106 molecules.

Answer 13

Ch. 12 - Prob. 1P Ch. 12 - Prob. 2P Ch. 12 - Prob. 3P Ch. 12 - Prob. 4P Ch. 12 - Prob. 5P Ch. 12 - Prob. 6P Ch. 12 - Prob. 7P Ch. 12 - Prob. 8P Ch. 12 - Prob. 9P Ch. 12 - Prob. 10P

The number of phospholipid molecules in 1µm 2 of the bilayer membrane needs to be calculated if phospholipid molecule occupies 70 Å 2 of surface area. Concept introduction: Lipids are fatty molecules that occupy 50% of the mass of the cell membrane. Most of the membrane lipids are phospholipids.

Answer to Problem 1P

Explanation of Solution

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Chapter 12 Solutions