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What is aquaporins?

Aquaporins are protein molecules embedded in the phospholipid bilayer (cell membrane ) of some cells. They transport water across the cell membrane.


What is the key structural element of a cell membrane?

The primary structural component of a cell membrane is the phospholid layers. This is mainly made of proteins which facilitate various cell activities.


When a membrane is freeze fractured the bilayer splits down the middle between the two layers of phospholipids In the electron micrograph of a freeze-fractured membrane the bumps seen on the fracture?

Integral Proteins.


What is found in a membrane?

phospholipid biolayer is the membrane it self. the protein is what gets stick in the membrane. protein In context of unit membrane, it consists of a fluid mosaic of phosphoplipid bilayer and proteins. A phospholipid bilayer is made up of two layers of phospholipids with their non-polar tails facing away from the aqueous environment and polar heads towards the aqueous environment. They make up 40% of the membrane. Proteins make up 60% of the membrane and are of two types: 1. Integral proteins 2. Peripheral proteins There can also be presence of cholesterol molecules in the membrane in the hydrophobic region.


What helps the cell hold its shape if it does not have a cell wall?

The cell has a lipid bilayer with embedded proteins that gives it shape. The cell membrane is rather fluid but also slightly rigid. This allows the cell to change shape but it cannot change shape very much. The membrane can seal itself if pierced by something very thin like a pin.The cell membrane holds it together as it's made of phospholipids.

Related Questions

What are the proteins embedded in the lipid bilayer?

peripheral proteins


Most receptor proteins are embedded in the?

Receptor proteins are embedded in the lipid bilayer of the cell membrane.


Are integrins embedded in the lipid bilayer?

Yes, integrins are transmembrane proteins that are embedded in the lipid bilayer of the cell membrane. They have both extracellular and intracellular domains that allow them to connect the cell's internal cytoskeleton with the extracellular matrix.


Embedded in the phospholipid bilayer?

Protein Molecules


Cell surface proteins float on top of phospholipid bilayers?

Yes, that's correct. Cell surface proteins are embedded within or attached to the phospholipid bilayer of the cell membrane. They interact with the lipid bilayer through hydrophobic and hydrophilic interactions, allowing them to float on the surface or be partially embedded within the membrane.


What is the phYSICAL parts of cell membrain?

The physical parts of a cell membrane include phospholipid molecules that form a lipid bilayer, proteins embedded within the lipid bilayer, cholesterol molecules that help regulate membrane fluidity, and carbohydrates attached to proteins and lipids on the outer surface. Together, these components make up the structure of the cell membrane, providing a selectively permeable barrier that separates the cell from its external environment.


Cell membrane made up of?

Phospholipid bilayer and embedded proteins and sugars


What proteins stay on the side of the bi layer?

Proteins that remain on the side of the lipid bilayer are typically referred to as peripheral or extrinsic proteins. These proteins are not embedded within the lipid bilayer but are loosely attached to the exterior or interior surfaces of the membrane, often through interactions with integral proteins or lipid head groups. They play key roles in signaling, maintaining cell shape, and facilitating communication between the cell and its environment. Examples include spectrin and certain enzymes that are involved in cellular processes.


What are proteins embedded in the plasma membrane called?

Proteins embedded in the plasma membrane are called integral membrane proteins. These proteins are permanently attached to the lipid bilayer and play important roles in various cellular functions such as cell signaling, transport, and cell recognition.


What are the two types of molecules that compose cellular membranes?

Cellular membranes are composed of phospholipids and proteins. Phospholipids create the basic structure of the membrane, forming a lipid bilayer, while proteins are embedded within this bilayer or attached to its surface, performing various functions such as transport, signaling, and structural support.


How can a lipid bilayer be fluid yet asymetrical?

There are proteins embedded in the membrane also. Some of these proteins exist on the aqueous side (outside) while others are only embedded on the inside. These are called peripheral membrane proteins. Some proteins go span the entire length of the lipid bilayer and are called transmembrane proteins. Peripheral membrane proteins are only temporarily attached and can become free by some types of stresses (i.e. detergents, solvents etc.). Integral membrane proteins are proteins that are permanently attached to the membrane.


What is the difference between peripheral and integral proteins?

Peripheral proteins are under the phospholipid bilayer, while integral proteins are inscribed in the bilayer.Integral proteins pass entirely through the lipid bilayer of the plasma membrane and have domains that go from the outside of the cell to the cytoplasm inside the cell. While peripheral proteins are only on the one side of the lipid bilayer, either the outside of the cell or the cytoplasmic side inside the cell, but not both.