Cell or Plasma Membranes

Yes, both protists and fungi have cell membranes that enclose their cells. These membranes are composed of lipid bilayers that regulate the movement of substances in and out of the cell, maintaining its internal environment and protecting it from the external environment.

Cholesterol molecules help to stabilize the plasma membrane by regulating its fluidity and flexibility. Additionally, glycolipids and glycoproteins on the outer surface of the membrane can contribute to cell adhesion and recognition. Proteins embedded in the membrane, such as integrins, also provide structural support and help with cell signaling.

Integral membrane proteins span the phospholipid bilayer one or more times. These proteins have transmembrane domains that anchor them within the lipid bilayer, allowing them to interact with both the extracellular and intracellular environments of the cell. Examples include transporters, receptors, and ion channels.

The cell membrane is impermeable to most ions. An ion channel is needed for cations and anions to cross the membrane, thus they can't freely pass the plasma membrane. Axons of neurons lack specific permeability for anions - which might explain why your asking this question and why you think cells lack anionic permeability (which they don't).

Ion channels in the axon have pores with high concentrations of negatively charged amino acids on the cellular and extracellular sides of the channel. This causes a repulsion of anion's while attracting cations, however being simple diffusion it's important not to suggest that the cations are being sucked out like a vacuum, the concentration gradient plays a predominant when dictating which ions and how fast they will be diffusion into our out of the cell.

Glycoproteins are integral proteins with carbohydrate sugars attached that stick out on the exterior surface of cell membranes to help recognize self. They play a crucial role in cell recognition and immune response by distinguishing between self and non-self cells.

No, the hydrophobic tails of the plasma membrane do not directly promote osmosis. Osmosis is the movement of water across a selectively permeable membrane from an area of high water concentration to an area of low water concentration. The hydrophilic heads of the plasma membrane allow water molecules to pass through, while the hydrophobic tails help maintain the structural integrity of the membrane.

The plasma membrane is formed primarily of a phosphor lipid bi-layer which can be saturated or unsaturated depending on the most profound fat ingested by the body. Composed of glycerol, phosphorus, and H2O (i think). Phosphor Lipids are commonly the only lipid found in the plasma membrane, however there are active protein channels and also passive channels activated by pressure formed by potassium inside the cell and sodium outside.

Perforin, a protein released by cytotoxic T cells and natural killer cells, forms pores in the cell membranes of invading cells. This disruption leads to osmotic imbalance, cell death, and elimination of the invading cell.

The plasma membrane separates the inside of a cell from its external environment. It is a selectively permeable barrier that controls the movement of substances in and out of the cell, allowing for the regulation of cellular processes and maintaining cell homeostasis.

Cell membranes are selectively permeable, meaning they allow certain substances to pass through while blocking others. They are not solid barriers; rather, they are made up of a fluid mosaic of lipids and proteins that can change and adapt to facilitate the movement of specific molecules in and out of the cell.

intercalated discs containing gap junctions and desmosomes.

The cell (plasma) membrane is organised into a bilayer of phospholipids. This means that the hydrophilic (water-lover) polar heads of the phospholipids face out, and the hydrophobic (water-hating) non-polar tails face towards each other in the centre of the layer.

Interspersed within the phospholipids of the membrane are proteins (such as protein channels), cholesterol and carbohydrates.

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.