Cell or Plasma Membranes

Cell membranes are not typically visible under a light microscope because they are thin and transparent. However, special staining techniques or electron microscopy can be used to make cell membranes visible.

Plasma membrane is a living structure because it performs many functions similar to living cells.

For example -

compartmentalization

transport

signal transduction

enzyme catalysis

organization of enzymes

The plasma membrane at the trigger zone of a neuron typically contains a higher density of voltage-gated ion channels, which are responsible for initiating action potentials. This allows for rapid signal transmission along the axon. In contrast, the plasma membrane on the soma (cell body) is involved in integrating signals from various sources before they are transmitted down the axon.

Selectively permeable means that only certain objects can pass through. I've encountered that phrase in cell Biology, when talking about cell membranes. The cell membrane is made of phospholipids that only allow certain substances through. Water can pass through because the molecules are small enough to pass through small holes in the membrane. Other molecules, such as sodium or potassium, can be transported using protiens.

fluid mosaic

Increasing cholesterol in the plasma membrane can make the membrane more rigid and less fluid. This can affect membrane permeability and the function of membrane proteins. Additionally, high levels of cholesterol can lead to the formation of lipid rafts, which can impact cell signaling pathways.

fine structure of plasma mambrane that can only be seen with electron microscope is called ultra structure of plasma mambrane the ultra structure of plasma mambrane is that this mambrane is consist of phospholipid bilayer in which protien molecules are embbeded at intervals in mosaic mannaer.

Cell membranes have proteins called transporters and channels that allow specific molecules to pass through by facilitating their movement across the membrane. Additionally, the lipid bilayer structure of the membrane is permeable to small, uncharged molecules like oxygen and carbon dioxide.

Plasma membranes are made up of phospholipids, these molecules are composed of fatty acid chains that are hydrophobic and phosphate group that are hydrophilic. Due to the properties of these subunits, phospholipids arrange themselves in a bilayer arrangement. The membrane also contains an abundance of proteins that may have various functions such as transport, identification and more.

Phospholipids are the fats that are both emulsifiers and important components of cell membranes. They have a hydrophilic ("water-loving") head and hydrophobic ("water-fearing") tail, allowing them to form a bilayer in cell membranes. This structure helps maintain the integrity and functionality of the cell.

The size, charge, and hydrophobicity of a molecule determine its ability to cross the plasma membrane. Small, nonpolar, and uncharged molecules can typically pass through the membrane via simple diffusion, while larger, charged, or hydrophilic molecules may require transport proteins or channels to facilitate their movement.

it is called that because albert mosaic improved to active the latest model.

Enveloped viruses do have a membrane that they got from their host.

All other viruses do not.

I love that fact that you're cheating in Biology.

A gap junction forms when a channel is created between two adjacent plasma membranes. This type of cellular junction allows for direct communication and passage of small molecules between the two cells.

Hydrophilic heads on plasma membranes attract water. These heads are composed of polar molecules that interact with water molecules due to their similar polarity, allowing water to be attracted to and interact with the membrane.

Yes, peroxisomes have a single membrane that surrounds their structure. This membrane helps to separate the contents of the peroxisome from the rest of the cell and plays a role in maintaining the organelle's function.

The protoplasm refers to all of the matter within the walls of the cell, such as the cytoplasm, nucleus and various organelles. All the protoplasm inside a cell that surrounds the nucleus is called the cytoplasm.

Cell membranes do not make nutrients for cells. They are primarily responsible for controlling the entry and exit of substances into and out of the cell, as well as maintaining the cell's internal environment. Nutrients are typically obtained from the external environment through processes such as diffusion or active transport.

No, peripheral steroids are not part of the plasma membrane. Peripheral steroids are molecules found in the cytoplasm and do not directly interact with the plasma membrane. The plasma membrane is primarily composed of phospholipids, proteins, and cholesterol.

Cytoplasmic Segregation is a theory about embryonic development related to cell differentiation. It states that an embryo has "cytoplasmic determinants" that influence gene expression (through transcription) and create a gradient, moving to the "vegetal" side of the cell. When the cell goes through mitosis, the "vegetal" and "animal" poles separate, each now having a limited cell fate. This process repeats, with the cytoplasmic determinants designating each cell to certain functions: organs, body segments, appendages, etc.

Note:

The last answer on this site was from an idiot.

The presence of unsaturated fatty acids in lipid bilayers helps plasma membranes resist freezing by preventing the lipid molecules from packing tightly together. Unsaturated fatty acids create kinks in the lipid tails, increasing membrane fluidity and allowing the membrane to remain flexible at lower temperatures.

The plasma membrane is a dynamic structure. It is composed of 2 layers of lipid material with protein molecules interspersed through out. The phospholipids move at a rate of 2um. /sec. while the proteins move at a much slower rate. The phospholipids have 2 definite ends, a hydrophilic (focusing to the outside and inside of the membrane) and a hydrophobic one (forming the center of the membrane

Osmosis is the movement of water from a solution of high concentration to a solution of lower concentration through a membrane. Water passes through the membrane, diluting the solution of higher concentration on the other side, until both solutions on either side of the membrane have equal concentrations.

Small, non-polar molecules such as oxygen, carbon dioxide, and lipid-soluble substances can pass through the plasma membrane by diffusion. Water can also move through the membrane via a special type of diffusion called osmosis.