what constitute a cell membrane and where are those substances synthesized?
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The site below should help....
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Centrioles.\n\nNucleic acid.\n\nCell membrane is found in both animals and plants but cell wall is found only in plants. Cell wall is made up of cellulose (carbohydrates), while cell membrane is made up of lipids. Cell wall does not regulate the movement of substances in and out of it, but cell membrane does.
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the nucleus of the cell controls and coordinates all the work of the cell. this takes care of composition.the cell wall and the cell membrane proects the cell
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if ur talking about cells... i think it is organelles...not sure
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by means of the cell membrane\n\nthe red blood cells although are the standards cells are not like others\n\ncontains no compartilization like most eukaryotes
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http://en.wikipedia.org/wiki/Human_cells
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cell wall - a thick, rigid membrane that surrounds a plant cell. This layer of cellulose fiber gives the cell most of its support and structure. The cell wall also bonds with other cell walls to form the structure of the plant.\n\nYou will find the rest here --> http://www.enchantedlearning.com/subjects/plants/cell/
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The cell membrane is made up of a phospholipid bilayer, with a polar phophate head and a nonpolar lipid tail. The polar head is hydrophilic, the nonpolar tail is hydrophobic. A fat molecule will face toward the nonpolar, hydrophobic tail.
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Nuclear membrane is formed by a series of  flattened cistenae aligned sideways with gaps called nuclear pores. There are pore complexes guarding the nuclear pores.The flattened cisternae are smooth- surfaced endoplasmic reticulum. It is a typical biological membrane of lipo-protein.\nPlasma membrane is glyco-lipoprotein complex.The overcoat of the plasma membrane is made by the Golgi Complex. It is a complex of carbohydrate side chains along with proteins.The overcoat lies over the bilayer of lipid through with proteins lie across: some  projected,  others buried in the bilayer of lipid. Plasma membrane contains several enzymes and channels connected with transport of ions and small molecular weight substances.
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The cell membrane is a lipid bilayer made from phospholipids.  As a lipid, it is permeable to other lipids (e.g. steroid hormones) but not to polar molecules (e.g. potassium or glucose).  Polar molecules require various types of membrane proteins (e.g. potassium channels) or endocytosis (glucose) for absorption into the cell.  \n\nHope this is helpful for you.  Best wishes and good luck.
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The cytoplasm containing the other cell parts.
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1. Nucleus\n2. Food Vacuole\n3. Contractile Vacuole\n4. Cytoplasm\n5. Psedopod\n6. Cell membrane
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1)  The cell is the unit of structure, physiology, and organization in living things. \n   2)  The cell retains a dual existence as a distinct entity and a building block in the   construction of organisms. \n   3)  Cells form by free-cell formation, similar to the formation of crystals (spontaneous generation).\n\nKeep this as hint and do your homework
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nucleus - \nOne or more per cell \nSpherical shape \nDenser than surrounding cytoplasm\n\nmembrane - \n\nNUCLEAR membrane - Surrounds nucleus\n- Composed of two layers\n- Numerous openings for nuclear traffic\n\nPlasma membrane\n\n- Outer membrane of cell that controls cellular traffic\n- Contains proteins (left, gray) that span through the membrane and allow passage of materials\n- Proteins are surrounded by a phospholipid bi-layer.\n\ncell wall - \n- Most commonly found in plant cells\n- Controls turgity\n\nvacuole - \n\n- Membrane-bound sacs for storage, digestion, and waste removal\n- Contains water solution\n- Contractile vacuoles for water removal (in unicellular organisms)\n\ncytoplasm - \nCollective term for cytosol and organelles contained within \nColloidal suspension \nCytosol mainly composed of water with free-floating molecules \nViscosity constantly changes\n\n\n\n\nEDIT:  Nucleus' job is to be the control center of the cell and also to store the DNA info.
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All membranes of the cell are selectively permeable-They would include the cell membrane (surround the whole cell), the nuclear membranes (inner and outer), the mitochondrial membranes (inner and outer), the smooth and rough endoplasmic reticulum, the Golgi apparatus, various vacuoles, lysosomes, and others.
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nucleus, cytoplasm and protoplasm ....
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Cytoplasm (which consists of cytosol and organelles).