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What structural feature on the surface of a plasma membrane allows cells to recognize one another?
Glycoproteins and glycolipids are structural features on the surface of the plasma membrane that allow cells to recognize one another. These molecules can act as cell identifiers by creating unique patterns that other cells can identify and respond to.
What are folds of the cell membrane on the free surface?
The folds on the free surface of a cell membrane are called microvilli. They increase the surface area of the cell membrane, allowing for greater absorption of nutrients and molecules. Microvilli are commonly found in cells that are involved in absorption, such as in the lining of the small intestine.
Which phospholipid bilayer has intrinsic and extrinsic protein molecules?
Both the inner and outer leaflets of the plasma membrane in a cell have intrinsic and extrinsic protein molecules embedded within the phospholipid bilayer. Intrinsic proteins are integral membrane proteins that span the membrane, while extrinsic proteins are peripheral membrane proteins that are attached to the surface of the membrane.
Give the 4 factors affecting substance transport?
-structure and composition of the membrane -sizes of molecules -movement of molecules -internal and external condition
Which part in the cell is fully permeable and selectively permeable?
The cell membrane is selectively permeable, allowing only certain molecules to pass through based on size, charge, and other factors. Conversely, the nuclear envelope is fully permeable to molecules of certain sizes.
What is the name of a surface membrane molecule that causes an immune reaction?
Antigens are surface membrane molecules that cause an immune reaction.
What membrane surface molecules bind to proteins and serve as molecules identification tags?
Carbohydrates
What proteins in the cell membrane identify your cells?
cell-surface markers
What structural feature on the surface of a plasma membrane allows cells to recognize one another?
Glycoproteins and glycolipids are structural features on the surface of the plasma membrane that allow cells to recognize one another. These molecules can act as cell identifiers by creating unique patterns that other cells can identify and respond to.
In cells of multicellular organisms the cell membrane contains molecules involved in cell communication what specific term is used to identify these molecules?
That kind of membrane in cells is called a mosaic membrane since the molecules are not all the same.
What are folds of the cell membrane on the free surface?
The folds on the free surface of a cell membrane are called microvilli. They increase the surface area of the cell membrane, allowing for greater absorption of nutrients and molecules. Microvilli are commonly found in cells that are involved in absorption, such as in the lining of the small intestine.
What molecules are on the outer surface of the plasma membrane?
The outside surface of the plasma membrane is made of a layer of molecules called phospholipids, which have hydrophobic and a hydrophilic parts. The hydrophilic parts are on the outside surface, attracted by the water and other hydrophilic molecules outside the cell. There are also proteins of various kinds attached to and embedded in this outer layer.
Which phospholipid bilayer has intrinsic and extrinsic protein molecules?
Both the inner and outer leaflets of the plasma membrane in a cell have intrinsic and extrinsic protein molecules embedded within the phospholipid bilayer. Intrinsic proteins are integral membrane proteins that span the membrane, while extrinsic proteins are peripheral membrane proteins that are attached to the surface of the membrane.
What is membrane infolding?
Membrane infolding is a process in which the cell membrane folds in on itself, creating internal compartments or structures within the cell. This folding increases the surface area of the membrane, allowing for more efficient transport of molecules and signaling within the cell. It is a common phenomenon in cells to increase membrane surface area for various functions such as nutrient uptake or organelle formation.
What are the bumps seen on the fractured surface of the membrane of a freeze-fractured bilayer?
The bumps seen on the fractured surface of a freeze-fractured bilayer are likely the lipid bilayer itself. When the bilayer is fractured, the hydrophobic interior of the membrane exposes lipid molecules, which appear as bumps on the fractured surface. Additionally, proteins embedded in the membrane can also contribute to the bumps seen on the fractured surface.
What are two characters of fluids?
Viscosity refers to a fluid's resistance to flow, which is influenced by the internal friction between its molecules. Surface tension is the result of cohesive forces between molecules at the surface of a fluid, causing it to behave as if it were covered by an invisible membrane.
What characteristics of a water molecule causes its attraction to a cell membrane?
The polarity of water molecules, due to their unequal distribution of charge, allows them to form hydrogen bonds with the polar head groups of phospholipids in the cell membrane. This attraction helps water molecules adhere to the membrane and interact with the hydrophilic regions of phospholipids. Additionally, the small size of water molecules enables them to move freely through the cell membrane.
