1. Which of the following is an example of paracellular water transport in an ep
ID: 189115 • Letter: 1
Question
1. Which of the following is an example of paracellular water transport in an epithelial cell layer? a. water moves across both the basal and apical membranes in response to hypertonicity created by salt transport b. water moves across the basal membrane and then the lateral membrane due to lateral intercellular hypertonicity c. water moves across cell-cell junctions in response to salt transport into the lateral intercellular spaces d. a and b 2. In extremely cold arctic waters, which of the following membrane phospholipid properties promote membrane fluidity in Antarctic dwelling fish? a. More unsaturated phospholipids b. More saturated phospholipids c. Hydrocarbon tails with less carbon double bonds d. a and c Q3-4. The graph below shows the relationship between the Km of lactate dehydrogenase (LDH) found in skeletal muscles and environmental temperature for 4 different species. Answer the following 2 questions 0.6 Temperate fish /Desert lizard Antarctic fish Polar fish -A- 0 2 0.1 0 10 20 30 40 50 Temperature (°C) 3. Does LDH substrate affinity increase or decrease with increasing temperature over the temperature range tested? a. Increase b. Decrease c. Stays the same d. Insufficient information shown to answer the questionExplanation / Answer
1. C - paracellular transport occurs by cell cell junction.
2. A - Lot of unsaturated fatty acids are required to maintain the fluditity of a membrane in antratic regions.
3. B - Decrease. At low Km only the substrate affinity will increase. But here increase in temperature leads to increase of Km it decrease the affinity of substrate with enzyme.
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