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Why cytoplasmic membrane is selective barrier rather than the cell wall?
Wiki User
∙ 12y ago
The cystoplasmic membrane and the cell wall are made of very different substances, and this affects their permeability to certain substances.
The cell wall is made of cellulose (plants) or murein (a peptidoglycon in bacteria/prokaryotic cells). These are carbohydrates.
The cytoplasmic membrane is made of 2 layers of phospholipids. It has many protein channels (tunnels of protein which can allow through certain chemicals needed by the cell, eg. Na+ sodium), or proteins which carry out active transport.
Therefore, the different compositions of the two give rise to their different properties.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoThe cell wall of the plant cell solely serves to give the cell a rigid shape and hold it in a certain way only.
A selective barrier is one that is semi-permeable. This means that this barrier (which in this case is a membrane) will only allow selective substances to pass through it, while blocking out unwanted substances.
The cell wall, on the other hand, allows all substances to pass through it. As such, it cannot be considered to be a selective barrier. The job of preventing the entry of unwanted substances is done by the cell membrane of the plant cell, which is directly right after the cell wall layer.
Wiki User
∙ 11y agoIf cells were to be permeable then whatever substances i.e., ions and molecules, enter the cells immediately exit! (since it is permeable) consequently nothing would remain concentrated inside the cell, metabolic processes cant occur and change in entropy becomes positive and the cell eventually dies. on the other hand if a cell is selectively or differentially permeable then ions and molecules can be retained to drive metabolic operations depending on the contingent needs of the cell.
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Movement of water rather than a solute through a cell membrane is called?
osmosis
Why is the cell membrane said to be a fluid mosaic?
Generally water and gases are described as fluid. In this context cell membrane is said to have a fluid mosaic model just because of it super flexible nature. Lipid bipolar molecules in the cell membrane can exhibit a flip flop movement. It can easily reseal after any breakage. So as fluid have an ease in changing their orientation likewise cell membrane posess a similar property. shankha LOL
What is the advantage of having all the major components of light reactions confined to the same membrane rather than being dissolved in the stroma or the cytosol?
You would have a better system for photosynthesis, because of how Chlorophyll work and how thyllakoid membranes are stacked together so that productivity is increased. So, having the physical barrier enables better reaction conditions.
Why is the membrane referred to as a fluid mosiac?
It is called that because the membrane is rather loose and moves easily since is a lipid. It is stabilized somewhat by cholesterol molecules (in animals cells only). The mosaic just means that there is more than one thing that makes up the membrane. Besides the cholesterol molecules there are various proteins embedded in the membrane as well.
What is the thin flexible barrier around the cell is called?
Cell wall
What is the meaning of selecting permeable?
Selective permeability refers to the function of plasma membranes that is needed to maintain homeostasis in a cell and prevent foriegn substances from entering through the cells walls. Some molecules can pass, some are blocked
What are the release dates for Dan Rather Reports - 2006 Great Barrier Grief?
Dan Rather Reports - 2006 Great Barrier Grief was released on: USA: 11 June 2013
Where is the rough endoplasmic recticulum in the cell?
The RER is a rather large organelle and it is next to the nuclear membrane and the cellular membrane.
How does selective logging protect topsoil?
Gold is less valuable than Topsoil. Yet Gold is now valued more than Topsoil, and Forests. I'd rather ask "How does selective logging protect Forests?"
What is the selective advantage of a mature red blood cell being flat rather than a sphere?
The selective advantage of a mature red blood cell being flat rather than a sphere is that is it easier for the cells to fit through veins and arteries. Red blood cells are also known as erythrocytes.
What is the benefit of harvesting trees by selective cutting rather than clear cutting?
Selective cutting leaves a canopy over the ground keeping it and streams that cross it cooler while also reducing runoff volume and erosion.
Movement of water rather than a solute through a cell membrane is called?
osmosis
Why people rather than machines need too manually separate some of the recycling mixture?
It is a method more sure and selective.
Membrane bones develop from hyaline cartilage structures?
It would be false to say membrane bones develop from hyaline cartilage structures. It is cartilage, rather than membrane bones, that comes from hyaline cartilage structures.
Can you see a nucleus in the cell Why?
Yes, you can see it if you use a microscope. As to why, it is rather large and is surrounded by a membrane.
Why is the cell membrane said to be a fluid mosaic?
Generally water and gases are described as fluid. In this context cell membrane is said to have a fluid mosaic model just because of it super flexible nature. Lipid bipolar molecules in the cell membrane can exhibit a flip flop movement. It can easily reseal after any breakage. So as fluid have an ease in changing their orientation likewise cell membrane posess a similar property. shankha LOL
Why are the walls of the alveoli one cell thick?
The reason for this is that oxygen and carbon dioxide need to diffuse through this membrane very quickly to re-oxygenate the blood. The thicker the barrier, the longer the process, and since breathing is rather rapid it needs to happen fast.
