Name the two forms of passive transport
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1. Name the two forms of passive transport.
2. With reference to a named, specific example, describe the processes involved in channel mediated diffusion. In your answe state what kind of transport it is.
3. Explain why the graph obtained for facilitated diffusion when velocity of transport of a given molecule is plotted against its concentration is a hyperbola. In your answer, highlight the events that occur along the hyperbola.
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- Visit this link (http://openstaxcollege.org/l/diffusion) to see diffusion and how it is propelled by the kinetic energy of molecules in solution. How does temperature affect diffusion rate, and why?1. With reference to a named, specific example, describe the processes involved in channel mediated diffusion. In your answe state what kind of transport it is.1. Explain why the graph obtained for facilitated diffusion when velocity of transport of a given molecule is plotted against its concentration is a hyperbola. In your answer, highlight the events that occur along the hyperbola.
- 8. Define homeostasis. maintoining nterral balance 9. What role does the cell membrane play in maintaining homeostasis? 10. How is facilitated diffusion different from diffusion? How are they similar? 11. List two ways that active transport is different than passive transport. 1) 2) 12. Why is the sodium-potassium pump considered an active transport? Which direction are the sodium and potassium bing pumped? How many sodiums are being pumped? How many potassiums are being pumped?7. The diffusion constant for the membrane protein fibronectin is approximately 0.7 x 10-12 cm²/sec, whereas that for rhodopsin is about 3 x 10-9 cm2/sec. Calculate the distance traversed (in nanometers) by each of these proteins in 50 msec.B) Rate of transport into the cll A or B 10 20 30 40 Time (min) The graph directly above shows the rate of substance transport over time when the cells that do not contain the compounds A, B, or C, are placed in 1 mM solutions of A, B, and C, respectively. Based upon these data which of the following is/are compatible modes of transport for substance A? (active transport, facilitated diffusion, simple diffusion) For substance B? For substance C?
- What is NOT true about diffusion: 1. A form of passive transport. 2. Uses adenosine triphosphate to transport substances across the plasma membrane. 3. Tendency of molecules to move from an area of higher concentration to an area or lower concentration. 4. Classified as either facilitated diffusion or simple diffusion.4. The graph below represents two different modes of transport across a biological membrane. One employs a membrane protein and the other does not. Which line represents transport with a membrane protein? Label each line with the mode of transport. There are three key characteristics of transport across a biological membrane using a membrane protein. What are these three key features? List and describe each feature. 107 A B Concentration difference across the mebrane Rate of TransportPárrafo Estilos the glucose molecules are chemically bonded more tightly on one side of the membrane than on the other. 9. Water moves across a cell membrane through a channel protein, whereas glucose moves across a cell membrane via a carrier protein. Which statement provides a valid comparison of these two membrane transport systems? Glucose moves in a direction from high to low concentration, while water moves in a direction that is not governed by differing solute concentrations. Water transport occurs without the cell using energy, whereas glucose transport requires energy input by the cell. A cell can add more sites for water transport to increase water movement across the membrane but cannot achieve the same result for glucose using a similar strategy. Several water molecules move one after the other through the opening provided by a channel protein, while glucose is transported across the membrane via a carrier protein one molecule at a time. Genetic mutations can alter glucose…
- 1. The specific molecule that pass through the cell membrane by osmosis . *2. What is one characteristic of a substances that can pass through the cell membrane by simple diffusion?3. A type of active transport that uses the energy stored in the movement of one molecule along its concentration gradient to move another substances against their own gradients.4. The source of energy for the conformational change of membrane proteins in primary active transport.How is active transport different from simple diffusion? Both active transport and simple diffusion transport molecules against the concentration gradient. In active transport, molecules are moved down the concentration gradient; on the B contrary, molecules to be transported in simple diffusion are moved against the concentration gradient. In active transport, molecules are transported with the aid of transport proteins; on the © other hand, molecules to be transported in simple diffusion do not need transport proteins. In active transport, molecules that are transported does not need metabolic energy; in contrast, molecules transported in simple diffusion need metabolic energy.1.There are different processes for transport of molecules of ions across cell membranes. Explain briefly each process a. Simples diffusion b. Facilitated diffusion via carrier proteins c. Facilitated diffusion via ion channels d. Primary active transport e. Secondary active transport f. Endocvtosis g. Exocytosis h. Transcytosis 2. List four Physical factors that affect the rate of diffusion and how they will affect it. 3. What kind of molecules can pass through the plasma membrane of the cells through simple diffusion? Give brief discussion. 4. List the three main parts of a cell and explain their functions. 5. Define an organelle. Which organelles are surrounded by a membrane and which are not? 6. What is the key difference between passive and active process? 7. Why RNA transcription can still serve the needs of the cell even if its operation is slow compared to DNA?
