
Plasma membrane and transport across the membrane
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54 questions
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- Q1What does the plasma membrane do?Separate membrane bound areas in a cell are formed and separated by membranes to allow different parts of the cell to have specific conditions for cellular reactionsIt separates the cell from its external environment30s
- Q2What is compartmentalisation and what is it for?Separate membrane bound areas in a cell are formed and separated by membranes to allow different parts of the cell to have specific conditions for cellular reactionsThe separating of the cell from its external environment30s
- Q3What are membranes made up of?A phospholipid bilayerA triglyceride bilayer30s
- Q4What does the term hydrophobic mean?Water hatingWater loving30s
- Q5Describe the structure of the phospholipid bilayer.Hydrophilic phosphate heads form the inner and outer surface of a membrane, sandwiching the fatty acid tails of the phospholipids to form a hydrophobic core inside the membrane. Hydrophobic tails point inwards to form the hydrophobic core.Hydrophobic phosphate heads form the inner and outer surface of a membrane, sandwiching the fatty acid tails of the phospholipids to form a hydrophilic core inside the membrane.30s
- Q6What does the term hydrophilic mean?Water lovingWater hating30s
- Q7Why are the phosphate heads on the inner and outer surface of the membrane?The internal and external environment of the cell is lipid soluble. The phosphate heads interact well with lipids and so they form the inner and outer surface of the membrane.The internal and external environment of the cell is aqueous. The phosphate heads interact well with water and so they form the inner and outer surface of the membrane.30s
- Q8What does the mosaic part of the fluid mosaic model mean?The phospholipids are free to move within the layer relative to each other giving the membrane flexibility.Proteins are embedded in the bilayer vary in shape, size and position.30s
- Q9What does the fluid part of the fluid mosaic model mean?The phospholipids are free to move within the layer relative to each other giving the membrane flexibility.Proteins are embedded in the bilayer vary in shape, size and position.30s
- Q10What is an intrinsic protein?A protein which spans the entire bilayerA protein lying present only on one side of the bilayer30s
- Q11What is an extrinsic protein?A protein which spans the entire bilayerA protein lying present only on one side of the bilayer30s
- Q12What is a glycolipid?phospholipids are attached to carbohydrates which in turn are bonded to a proteinphospholipids are attached to carbohydrates which in turn are bonded to a lipid30s
- Q13What is a glycoprotein?phospholipids are attached to carbohydrates which in turn are bonded to a lipidphospholipids are attached to carbohydrates which in turn are bonded to a protein30s
- Q14Which type of substances pass freely through the phospholipid bilayer?Large polar moleculesLarge moleculesPolar moleculesSmall non polar or lipid soluble molecules30s
- Q15What are carrier proteins?Take part in passive and active transport. The shape of the protein changes for this.A hydrophilic channel that allows passive movement of polar molecules and ions down their concentration gradient through membranes. Outside of the protein have hydrophobic R-groups to interact with the hydrophobic core of the membrane.30s