Access to Higher Education Core Biology Assignment The name of the cell organelle‚ or structure‚ to which each of the following statements refers: a)Fully permeable layer found outside the membrane of some cells. Cell Wall b)Series of membranes in the cytoplasm through which materials can be transported and in which proteins accumulate. Endoplasmic Reticulum c)Site of ribosomal RNA synthesis. Nucleus d)Partially permeable layer about 7.5nm thick. Cell Membrane e)Structures responsible for producing
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2. Transmembrane proteins-integral membrane proteins are proteins that expand the membrane 3. Interior protein network-peripheral proteins are in the interior side of the membrane 4. Cell surface markers are glycolipids‚ carbohydrates/lipid residues 5. Cholesterol helps maintain the membrane fluidity‚ they are between the phospholipids if the temperature drop it helps the membrane not to solidify 5. How did the advent of electron microscopy revolutionize cell biology
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model? The fluid mosaic model is a model conceived by S.J. Singer and Garth Nicolson in 1972 to describe the structural features of biological membranes. The membrane is described to be fluid because of its hydrophobic integral components such as lipids and membrane proteins that move laterally or sideways throughout the membrane. That means the membrane is not solid‚ but more like a ’fluid’. The membrane is depicted as mosaic because like a mosaic that is made up of many different parts the plasma
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shaped structures‚ enclosed by double membrane carries enzymes for respiration - Production of ATP Mitochondria: Spherical/rod shaped structures‚ enclosed by double membrane carries enzymes for respiration - Production of ATP Plasma membrane: Lipid bilayer composed of
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the biological membrane has proved to be vital in countless mechanisms necessary to a cells survival. The phospholipid bilayer performs the simpler functions such as compartmentation‚ protection and osmoregulation. The proteins perform a wider range of functions such as extracellular interactions and metabolic processes. The carbohydrates are found in conjunction with both the lipids and proteins‚ and therefore enhance the properties of both. This may vary from recognition to protection. Overall
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Biology I Chapter 5 Membranes LearnSmartThe lipid bilayer of cell membranes acts as a barrier to the free movement of substances that are Hydrophilic Water soluble True or False: In order to survive‚ grow and reproduce‚ a cell must continually exchange materials and information with its environment. True Unlike prokaryotic cells‚ eukaryotic cells have internal membranes‚ which surround their organelles. Which structure surrounds all cells? Plasma membrane A defining feature of biological
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The drug “dinitrophenol” (DNP) was prescribed by some physicians in the 1940’s to help patients lose weight. This unsafe method was abandoned after a few patients died. DNP uncouples the chemiosmotic machinery by making the lipid bilayer of the inner mitochondrial membrane leaky to H+. Explain how this could cause weight loss. In chemiosmosis‚ NADH are passed along the electron transport chain‚ with energy used to pump protons across the inner mitochondrial membrane. As the protons are transferred
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biological membranes‚ the plasma membrane is selectively permeable‚ allowing some substances to cross more easily than others. Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins The main macromolecules in membranes are lipids and proteins‚ but carbohydrates are also important. The most abundant lipids are phospholipids. Phospholipids and most other membrane constituents are amphipathic molecules. Amphipathic molecules have both hydrophobic regions and hydrophilic regions.
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Biochim. Biophys. Acta 649 (1): 125–8. doi:10.1016/0005-2736(81)90017-1. PMID 7306543. * Weinberg G‚ Ripper R‚ Feinstein DL‚ Hoffman W (2003). "Lipid emulsion infusion rescues dogs from bupivacaine-induced cardiac toxicity". Reg Anesth Pain Med 28 (3): 198–202. doi:10.1053/rapm.2003.50041. PMID 12772136. * Picard J‚ Meek T (February 2006). "Lipid emulsion to treat overdose of local anaesthetic: the gift of the glob". Anaesthesia 61 (2): 107–9. doi:10.1111/j.1365-2044.2005.04494.x. PMID 16430560
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adjecent or near the secondary cell wall in a cell. It is a living outermost boundary of all the cells three layer that is two protein layers on either side and a double middle layer The plasma membrane consists mostly of phospholipids‚ arranged in a bilayer‚ and proteins‚ most of which are glycoproteins. 2. Name several functions carried out by membrane proteins. Most functions of the plasma membrane depend on the types of proteins that are present. Integral proteins called receptors recognize and
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