Cell or Plasma Membranes

The selectively permeable function of the cell membrane allows for the control of what substances enter and exit the cell. This helps the cell maintain internal stability by regulating the passage of molecules, ions, and nutrients. This selective permeability is crucial for cellular processes, such as nutrient uptake and waste removal, which are essential for cell health.

http://pathmicro.med.sc.edu/mhunt/RNA-HO.htm Transmembrane proteins are made on ribosomes bound to the endoplasmic reticulum. They are inserted into the endoplasmic reticulum membrane as they are made, glycosylated in the endoplasmic reticulum and pass through the Golgi body where substantial modification of the carbohydrate chains occurs. They are then transported, in vesicles, to the appropriate cell membrane; in the case of vesicular stomatitis virus, this is the plasma membrane

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Active transport

The plasma membrane is provided with very small passages to allow the molecules of water and ions of other elements. It is made up of lipo-proteins and has semipermeability.

While water does pass through the membrane if it has enough momentum, the apolar part of the lipid bilayer generally is what makes the membrane more or less waterproof.

You can get viruses through contact and through the air. The cells of Mucous membrane, such as those lining the respiratory passages that we breathe through, are open to virus attacks because we breathe the air and we can't stop breathing or we die. We also don't know who might have it and we could walk by someone who sneezed/coughed and getinvectived.

The elastic nature of plasma membranes helps amoebas in a few different ways, such as with movement. It also helps them engulf food.

No, cell walls are not found in the animal kingdom.

The answer lies with proteins. A specific kind of protein called an enzyme lowers the activation energy of chemical reactions. Reactions that would normally take years happen in seconds. Figure 7.1 shows how this effect alters chemical equilibrium. Consider a set of chemicals that have two paths to interact as shown in figure 7.1. One reaction is a side reaction that is undesirable. The other is desirable.

The enzyme lowers the activation energy for the desirable reaction making it happen quickly. The undesirable reaction does not have a chance. Also notice that the entropy of the universe is maximized by the undesirable reaction. Thus, from thermodynamic considerations, one might think that the undesirable reaction is always dominant, but because the laws of thermodynamics have no way to deal with time, this observation is seldom true. The enzyme is not violating the second law by forcing the reaction in the preferred direction. Its reaction is also spontaneous in that it also increases the entropy of the universe. By making the desired reaction happen faster, the enzyme does not give the undesirable reaction time to happen.

Small cells are better able to transport material more efficiently. Many convolutions increase the surface area of the cell, thus allowing for more interactions between the cell and its environment. A large cell has greater volume to its surface area and if this is too large, it will not get enough protein and oxygen.

Phospholipids form the lipid bilayer that are the basis of cell membranes.

The cell membrane is composed of the lipid bilayer. In addition to lipids most membranes contain proteins and carbohydrates.

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YOUR finger nails and hair are made out of Keratin. its a protein (so is whale baleen and animal horns)

There are two ways for cells to divide and produce more cells. One is through the process of mitosis and the other is through budding. Budding produces a smaller cell off of the larger cell.

The cell membrane of mammalian cells is only 7 nm thick separating the intracellular ... The response of the cell to specific changes in its environment requires ... This includes many fundamental and biomedically relevant processes ... This means that all this organization is undetectable using conventional.

To create a gradient and to charge the membrane so that other processes can take place.

Porifera = sponges.

Cnidaria = jellyfish

Mollusca = molluscs

Nematoda = round worms

Was used to help colonists to fry items in the fireplace with out having to stand and hold the pan. A spider is a mesh "dipper" for separating food from the liquid, normally hot oil.

Not everything, no. It depends on the cell, some cell membranes are permeable to water (called osmosis) but not smaller particles like proteins. Whereas, some are permeable to proteins and other small particles but not to larger particles.

If your cells can't get a steady stream of glucose, the cell will die.

Mitochondria is acidophilic because it has membrane proteins which have a net positive charge . Any structures are acidophilic if they stain with eosin, which is a negatively charged dye that stains pink to red.

Gates function in a similar way to a cell membrane because they regulate entry and exit of people into homes just like the cell membrane controls movement of substances into and out of the cell.

no

The cell membrane supports the structure of the cell, acts as a barrier to regulate the movement of substances in and out of the cell, and helps maintain internal balance by controlling the exchange of molecules.

All living eukaryotic cells are surrounded by a plasma membrane made of two layers of phospholipids and integrated proteins. Prokaryotic cells also show this structure, but have additional layers of peptidoglycan and occasionally lipoproteins.

The hydrphilic head and the hydrophobic tail, absorb water. brought to you by j.