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Chapter 5 Workfile/Study Sheet 1.What type of organisms contain biomembranes? All living organisms contain biomembranes. 2.Describe the nature of cellular membranes. Cellular membranes are fluid by nature. 3.What is the major lipid found in membranes? Phospholipids 4.What component of the cell membrane might contribute to maintaining the fluidity of the plasma membranes? Chlosterol 5.Describe globular proteins found in the membrane. They are compacted and folded Amino acids. 6.What percentage of all genes encode membrane proteins? 25% 7.Give some of the common functions of cellular membranes. To protect the integrity of the interior of the cell by allowing certain substances into the cell, while keeping other…show more content…
A type of transporter that binds two or more ions Or molecules and transports them in the same Direction across a membrane. 25.The transport of Ca2+ from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration) describes what kind of transport? Active transport 26.Acetylcholine binds this membrane protein, which subsequently opens to allow sodium to enter the cell. Acetylcholine exerts its effect on what type of transport protein? Ligand-gated channel 27.Sodium concentrations are higher outside and glucose concentrations are higher inside the cell. Using the same membrane protein for Na+ and glucose transport, what is it called when a Na+ electrochemical gradient is used to drive glucose transport into the cell against its concentration gradient? Secondary active transport 28.Define antiporters. A type of transporter that binds two or more ions Or molecules and transports them in opposite Directions across a membrane. 29.Describe the sodium-potassium pump. As 3 sodium ions leave the cell, 2 potassium Ions enter. 1 ATP is used in this constant Exchange. 30.Define exocytosis. A process in which material inside a cell is Packaged into vesicles and excreted into the Extracellular medium. 31.Define receptor-mediated endocytosis. A common form of endocytosis in which A receptor is specific for a given

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