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Membrane in Biological Definition

Actin

... case, one end of myosin is bound to the plasma membrane while the other end walks towards the plus end of the actin filament. This pulls the membrane into a different shape relative to the cell ... form the cells cortex. This underlies the plasma membrane and is responsible for the shape of the cell. ...

Antibody

... kD. It can be found on the surface of the plasma membrane of basophils and mast cells of connective ... This complex is moved to the outside of the cell membrane , where it can be recognized by a T lymphocyte , ... compares it to similar structures on the cell membrane of a B lymphocyte . If it finds a matching pair, ...

Apoptosis

... the nuclear envelope . At this stage, the double membrane that surrounds the nucleus still appears ... due to the degradation of DNA [4] . Plasma membrane blebbings. The cell is phagocytosed , or , ... major extrinsic mediator of apoptosis. The cell membrane has two specialized receptors for TNF: TNF-R1 and ...

Bacterium

... Gracilicutes - bacteria with a second cell membrane containing lipids , giving them Gram-negative stains Firmicutes - bacteria with a single membrane and thick peptidoglycan wall, giving them ... stains Mollicutes - bacteria with no second membrane or wall, giving them Gram-negative stains ...

Biological membrane

... A biological membrane or biomembrane is a membrane which acts as a barrier within or around a cell ... that differs from the outside. For example, the membrane around peroxisomes shields the rest of the cell ...

Cell biology

... such as those to be incorporated in membranes ( membrane proteins ), are transported into the ER during ... in the Golgi apparatus . From the Golgi, membrane proteins can move to the plasma membrane , to other subcellular comparments or they can be ...

Cell nucleus

... to 20 micrometres . It is enclosed by a double membrane called the nuclear envelope . The inner and outer membrane fuse at regular intervals, forming nuclear pores ... reactions happening within the nucleus. The outer membrane is continuous with the rough endoplasmic ...

Chloroplast

... Both organelles are surrounded by a double membrane with an intermembrane space; both have their own ... chloroplasts, forming chloroplasts with four membrane layers. The fluid within the chloroplast is ... thylakoid. The photosynthetic proteins in the membrane bind chlorophyll , which is present with various ...

Chloroplast membrane

... envelope, called the chloroplast envelope . Each membrane is a phospholipid bilayer , between 6 and 8 nm ... called the intermembrane space. The outer membrane is permiable to most ions and metabolites , but the inner membrane is highly specialised with transport proteins . ...

Depolarization

... refers to the event a cell undergoes when its membrane potential grows more positive with respect to ... Compare to hyperpolarization . Depolarization of membrane potentials is important for other cell types, ... muscle cells. Related topics membrane potential action potential ...

Diffusion

... depends on the concentration gradient, and the membrane potential. The net flux of ions can be altered by ... of a solute across a selectively permeable membrane . Photon diffusion When photons travel ... junction transistor Brownian motion Cell membrane Circulatory system Diffusion equation ...

Electron transfer chain

... motive force created by the ETC is used to power membrane transporters and adenosine triphosphate ... ETC is found spanning the inner mitochondrial membrane and accepts electrons from electron donors ... matrix across the inner mitochondrial membrane into the intermembrane space, where the ...

Endoplasmic reticulum

... and composition is similar to the plasma membrane , though it is an extension of the nuclear membrane . The ER is the site of the translation and ... proteins that are to become part of the cell membrane (e.g., transmembrane receptors and other ...

Endomembrane system

... part of the endomembrane system: The plasma membrane is a lipid bilayer membrane that separates the cell from its environment and ... out of the cell. The nuclear envelope is the membrane around the nucleus of the cell. The ...

Bacterium

... Gracilicutes - bacteria with a second cell membrane containing lipids , giving them Gram-negative stains Firmicutes - bacteria with a single membrane and thick peptidoglycan wall, giving them ... stains Mollicutes - bacteria with no second membrane or wall, giving them Gram-negative stains ...

Eukaryote

... in which the genetic material is organized into membrane - bound nuclei . They include the animals , ... a process of endocytosis , where the outer membrane invaginates and then pinches off to form a ... tube- and sheet-like extensions of the nuclear membrane form what is called the endoplasmic reticulum ...

Fick's law of diffusion

... that the rate of diffusion of a gas across a membrane is Constant for a given gas at a given ... in partial pressures of the gas across the membrane , P 2 - P 1 Inversely proportional to ... . The exchange rate of a gas across a fluid membrane can be determined by using this law together with ...

Flagellum

... and has a sharp bend just outside the outer membrane called the "hook" which allows the helix to point ... the peptidoglycan layer and one in the plasma membrane . Gram-negative organisms have 4 rings: L ring ... layer, M ring is imbedded in the plasma membrane , and the S ring is directly attached to the ...

Cell membrane

... biological cell , the selectively permeable cell membrane (or plasma membrane or plasmalemma ) is a thin and structured ... other proteins with a variety of functions. These membrane proteins are important for the regulation of cell ...

Intermediate filament

... cytosol from the nuclear envelope to the cell membrane . Contents showTocToggle("show","hide") ... the lamin network and are attached to the nuclear membrane by lamin B. (See also: nuclear envelope ) ... and endothelial cells , they support the cell membrane and keep some organelles in a fixed place ...

Intermembrane space

... space is the region between the inner membrane and the outer membrane of a mitochondrion or a chloroplast . Its ... . Channel proteins called porins in the outer membrane allow free movement of ions and small ...

Ion channel

... Basic features An ion channel is an integral membrane protein or more typically an assembly of several ... a water-filled pore through the plane of the membrane or lipid bilayer . While large-pore channels ... or potassium , and conveys them through the membrane single file--nearly as fast as the ions move ...

Actin

... case, one end of myosin is bound to the plasma membrane while the other end walks towards the plus end of the actin filament. This pulls the membrane into a different shape relative to the cell ... form the cells cortex. This underlies the plasma membrane and is responsible for the shape of the cell. ...

Mitochondrion

... distinct membranes: the outer mitochondrial membrane and the inner mitochondrial membrane . The outer mitochondrial membrane completely encloses the organelle, serving as its ...

Mitochondrion

... distinct membranes: the outer mitochondrial membrane and the inner mitochondrial membrane . The outer mitochondrial membrane completely encloses the organelle, serving as its ...

Mitosis

... a part of prophase. In this phase, the nuclear membrane dissolves in some eukaryotes, reforming later ... undergo closed mitosis, in which the nuclear membrane persists throughout. Now kinetochores begin ... arrive at poles by this stage. The nuclear membrane reforms around the genetic material and the ...

Osmosis

... of a solvent through a semipermeable membrane from a region of low solute concentration to ... of high solute concentration. The semipermeable membrane is permeable to the solvent, but not to the ... in a chemical potential difference across the membrane which drives the diffusion. That is, the solvent ...

Oxidative phosphorylation

... . The process takes place at a biological membrane . In prokaryotes this is the plasma membrane , and in eukaryotes it is the inner of the two ... reductase ) to pump H + across the membrane against a proton gradient . A large protein ...

Passive transport

... on the organization and characteristics of the membrane lipids and proteins. The four main kind of ... is movement of molecules across the cell membrane via special carrier proteins that are embedded ... in lipids and too large to fit through the membrane pores. Therefore, it will bind with its specific ...

Peripheral membrane protein

... Peripheral membrane proteins are proteins that adhere only loosely to the biological membrane with which they are associated. These molecules ... indirectly, typically by binding to integral membrane proteins , or by interactions with the lipid ...

Phospholipid

... tails line up against each other, and forms a membrane with hydrophilic heads on both sides extending ... rates into or out of a cell membrane. This membrane is partially permeable , very flexible, and has ... are constantly moving laterally across the membrane because of the forces generated by their ...

Cell membrane

... biological cell , the selectively permeable cell membrane (or plasma membrane or plasmalemma ) is a thin and structured ... other proteins with a variety of functions. These membrane proteins are important for the regulation of cell ...

Plasmolysis

... loss of water through osmosis . It is the cell membrane peeling off of the cell wall and the vacuole collapsing. Plasmolysis occurs when a plant cell's membrane shrinks away from its cell wall. This phenomenon ... fluid. The movement of water occurs across the membrane moving from an area of high water concentration ...

Proton pump

... A proton pump is an integral membrane protein that is capable of moving protons across the membrane of a cell , mitochondrion , or other ... by reduced cytochrome c . In the plasma membrane proton ATPase and in the ATPase proton pumps ...

Ribosome

... or in the organelle they occur in. membrane bound ribosomes When certain proteins are ... can become "membrane-bound", associated with the membrane of the nucleus and the rough endoplasmic ... produce proteins that are used within the cell membrane or are expelled from the cell via exocytosis ...

Endoplasmic reticulum

... and composition is similar to the plasma membrane , though it is an extension of the nuclear membrane . The ER is the site of the translation and ... proteins that are to become part of the cell membrane (e.g., transmembrane receptors and other ...

Endoplasmic reticulum

... and composition is similar to the plasma membrane , though it is an extension of the nuclear membrane . The ER is the site of the translation and ... proteins that are to become part of the cell membrane (e.g., transmembrane receptors and other ...

Signal transduction

... from the outside and interact with the cell membrane . Several "signaling molecules", such as the ... synapses , bind to receptor proteins in the membrane and open their ion channels . Responses ... to receptors that face outwards from the membrane and trigger events inside. This takes place via a ...

Endoplasmic reticulum

... and composition is similar to the plasma membrane , though it is an extension of the nuclear membrane . The ER is the site of the translation and ... proteins that are to become part of the cell membrane (e.g., transmembrane receptors and other ...

Mitosis

... a part of prophase. In this phase, the nuclear membrane dissolves in some eukaryotes, reforming later ... undergo closed mitosis, in which the nuclear membrane persists throughout. Now kinetochores begin ... arrive at poles by this stage. The nuclear membrane reforms around the genetic material and the ...
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