Under what scenarios would a cell add/remove cholesterol from its cell membrane?
The addition of cholesterol prevents lipids from condensing into the solid phase, induces the formation of liquid-ordered phase and in such a way makes the membrane more fluid. More fluidity is required at higher temperatures where there is a danger of membrane being turned into a more solid one and the reverse is true at higher temperatures where there is a danger of cell membrane being more liquid, at that time the removal of cholesterol occurs from the membrane to make it more solid.
Under what scenarios would a cell add/remove cholesterol from its cell membrane?
Depletion of cholesterol in the cell membrane using a drug (mevastatin) has been associated with apoptosis in cancer cells. a. What effect would cholesterol depletion have on the integrity of lipid rafts in the membrane? b. Researchers found that FAS death receptor was activated in cholesterol depleted cancer cells. Explain how activation of this receptor activates killer caspases. c. When a caspase is converted from its inactive to its active form there are changes in the primary and tertiary structure...
Under certain circumstances, potassium ions in a cell will move
across the cell membrane from the inside to the outside. The
potential inside the cell is -75.5mV and the potential outside he
cell is zero. What is the change in the electrical potential energy
of a single potassium ion as it moves across the membrane ?
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Membrane Permeability a. What molecule makes up the majority of the cell membrane and how does its structure create the semi-permeable nature of the membrane? b. For each of the following molecules describe whether or not it can freely diffuse across a cell membrane. Justify your answers. RNA, Cholesterol, Carbon Dioxide (CO2), Sodium ions (Na+), please be as detail as possible.
Under certain circumstances, potassium ions (K") in a cell will move across the cell membrane from the inside to the outside. The potential inside the cell is -80.5 mV and the potential outside the cell is zero. What is the change in the electrical potential energy of a single potassium ion as it moves across the membrane? change in potential energy: 1.36 x10 Does the potential energy of the potassium ions increase, decrease, or remain the same as the ions...
Under certain circumstances, potassium ions (K+) in a cell will move across the cell membrane from the inside to the outside. The potential inside the cell is-80.5 mV and the potential outside the cell is zero. What is the change in the electrical potential energy of a single potassium ion as it moves across the membrane? change in potential energy: Does the potential energy of the potassium ions increase, decrease, or remain the same as the ions move from the...
Under certain circumstances, potassium ions (K) in a cell will move across the cell membrane from the inside to the outside. The potential inside the cell is -70.5 mV and the potential outside the cell is zero. What is the change in the electrical potential energy of a single potassium ion as it moves across the membrane? change in potential energy: Does the potential energy of the potassium ions increase, decrease, or remain the same as the ions move from...
If the cell needs to synthesize a protein to build its cell membrane what is the process that the mRNA transcript needs to go through? (explain all steps)
Q4. For each of the following scenarios describe what happens in normal cells and cells with the perturbation A. A cell that has no functional flippasesi 1 B. A membrane that contains only saturated fatty acids in glycerophospholipids and sphingolipids. C. Chymotrypsin with serine 195 mutated to tyrosine 5 D. Membranes in a mammalian cell that can't take up or synthesize cholesterol
A particular eukaryotic cell, called Cell X, has red pigment in its cell membrane. A different eukaryotic cell, called Cell Y, has yellow pigment in its cell membrane. Each cell underwent five mitotic divisions, and researchers observed the offspring for pigment color. The results showed that all the offspring of Cell X had red pigment in their cell membrane, and all the offspring of Cell Y had yellow pigment in their cell membrane. Which of the following statements best explains...
A typical cell has an electric potential difference across its cell membrane, The electric potential interior to the cell is 70mV less than that on the exterior. Under certain circumstances, the cell can redistribute charge so that the electric potential inside is 40 mV greater than that outside. Assuming the membrane is 12 nm thick and that the net electric field inside it is uniform, how does that field change in the transition from having an interior that is 70...