Which of the following molecules dramatically increases the rate of diffusion

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Which molecule increases the rate of diffusion of water across cell membranes?
What would increase the rate of facilitated diffusion?
What molecules are more likely to diffuse?
Which of the following is a way to increase the rate of diffusion of molecules across a membrane?

QuestionAnswer active transport method of transporting material that requires energy uniporter transporter that carries one specific ion or molecule transporter specific carrier proteins or pumps that facilitate movement amphiphilic molecule possessing a polar or charged area and a nonpolar or uncharged area capable of interacting with both hydrophilic and hydrophobic environments transport protein membrane protein that facilitates a substance's passage across a membrane by binding it tonicity amount of solute in a solution antiporter transporter that carries two ions or small molecules in different directions symporter transporter that carries two different ions or small molecules, both in the same direction solute substance dissolved in a liquid to form a solution aquaporin channel protein that allows water through the membrane at a very high rate selectively permeable membrane characteristic that allows some substances through carrier protein membrane protein that moves a substance across the plasma membrane by changing its own shape secondary active transport movement of material that results from primary active transport to the electrochemical gradient receptor-mediated endocytosis variation of endocytosis that involves using specific binding proteins in the plasma membrane for specific molecules or particles, and clathrin-coated pits that become clathrin-coated vesicles channel protein membrane protein that allows a substance to pass through its hollow core across the plasma membrane pump active transport mechanism that works against electrochemical gradients primary active transport active transport that moves ions or small molecules across a membrane and may create a difference in charge across that membrane concentration gradient area of high concentration adjacent to an area of low concentration plasmolysis detaching the cell membrane from the cell wall and constricting the cell membrane when a plant cell is in a hypertonic solution pinocytosis a variation of endocytosis that imports macromolecules that the cell needs from the extracellular fluid diffusion passive transport process of low-molecular weight material according to its concentration gradient peripheral protein protein at the plasma membrane's surface either on its exterior or interior side passive transport method of transporting material through a membrane that does not require energy electrochemical gradient a combined electrical and chemical force that produces a gradient osmosis transport of water through a semipermeable membrane according to the water's concentration gradient across the membrane that results from the presence of solute that cannot pass through the membrane osmolarity total amount of substances dissolved in a specific amount of solution electrogenic pump pump that creates a charge imbalance isotonic situation in which the extracellular fluid has the same osmolarity as the fluid inside the cell, resulting in no net water movement into or out of the cell integral protein protein integrated into the membrane structure that interacts extensively with the membrane lipids' hydrocarbon chains and often spans the membrane endocytosis type of active transport that moves substances, including fluids and particles, into a cell hypotonic situation in which extracellular fluid has a lower osmolarity than the fluid inside the cell, resulting in water moving into the cell hypertonic situation in which extracellular fluid has a higher osmolarity than the fluid inside the cell, resulting in water moving out of the cell exocytosis process of passing bulk material out of a cell hydrophobic molecule that does not have the ability to bond with water; "water-hating" hydrophilic molecule with the ability to bond with water; "water-loving" facilitated transport process by which material moves down a concentration gradient (from high to low concentration) using integral membrane proteins fluid mosaic model describes the plasma membrane's structure as a mosaic of components including phospholipids, cholesterol, proteins, glycoproteins, and glycolipids (sugar chains attached to proteins or lipids, respectively), resulting in a fluid character (fluidity) glycolipid combination of carbohydrates and lipids glycoprotein combination of carbohydrates and proteins Which of the following is an accurate description of the plasma membrane? Two layers of phospholipids with a number of proteins embedded within What is a phospholipid? A special kind of lipid with a water-loving head and 2 water-fearing tails How many layers of phospholipids make up the plasma membrane? 2 Which of the following molecules dramatically increases the rate of diffusion of water across cell membranes? aquaporins According to the fluid mosaic model, a membrane ________. is composed of a fluid bilayer of phospholipids with embedded amphipathic proteins What will happen to a red blood cell (RBC), which has an internal ion content of about 0.9%, if it is placed into a beaker of pure water? The cell would swell because the water in the beaker is hypotonic relative to the cytoplasm of the RBC. Celery stalks that are immersed in fresh water for several hours become stiff. Similar stalks left in a 0.15 M salt solution become limp. From this we can deduce that the fresh water ________. is hypotonic and the salt solution is hypertonic to the cells of the celery stalks Which would most likely pass unaided through a plasma membrane? Something small and nonpolar, such as nitrogen gas According to the fluid mosaic model of cell membranes, phospholipids ________. can move laterally along the plane of the membrane Which of the following statements about diffusion is true? it is a passive process in which molecules move from a region of higher concentration to a region of lower concentration. When a cell is in equilibrium with its environment, which of the following processes occurs for substances that can diffuse through the plasma membrane? There is random movement of substances into and out of the cell. What is the main role of membrane proteins? Regulate the passage of materials in and out of the cell Which of the following statements is a reasonable explanation for why unsaturated fatty acids help keep a membrane more fluid at lower temperatures? The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly. The passive transport of water is specifically called ________. osmosis Cell membranes have distinct inside and outside faces. Which of the following statements is the most likely explanation for the membrane's asymmetrical nature? The two sides of a cell membrane face different environments and carry out different functions. The sodium-potassium pump is called an electrogenic pump because it ________. is used to drive the transport of glucose against a concentration gradient Which form of transport requires the expenditure of energy? Active transport The voltage across a membrane is called the ________. membrane potential What is the definition of endocytosis? It is the transport of large molecules into the cell. Diffusion of ions across membranes through specific ion channels is driven by ________. ion electrochemical gradients For a protein to be an integral membrane protein, it would have to be ________. amphipathic, with at least one hydrophobic region Which of the following statements correctly describes osmosis? In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration. What might happen to your red blood cells if you were suddenly unable to regulate the solute concentration of your blood and it began to rise? Your blood cells would shrivel because water would move out of the cells via osmosis.

Which molecule increases the rate of diffusion of water across cell membranes?

Because of the slow diffusion of water across the lipid bilayer, aquaporins effectively increase the overall rate of water movement across the cell membrane.

What would increase the rate of facilitated diffusion?

The main factors affecting the process of facilitated diffusion are: Temperature- As the temperature increases, the movement of the molecules increases due to an increase in energy. Concentration- The movement of the molecules takes place from the region of higher concentration to lower concentration.

What molecules are more likely to diffuse?

Gases, hydrophobic molecules, and small polar uncharged molecules can diffuse through phospholipid bilayers. Larger polar molecules and charged molecules cannot.

Which of the following is a way to increase the rate of diffusion of molecules across a membrane?

Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion. Lower temperatures decrease the energy of the molecules, thus decreasing the rate of diffusion.

Which of the following molecules dramatically increases the rate of diffusion

Which molecule increases the rate of diffusion of water across cell membranes?

What would increase the rate of facilitated diffusion?

What molecules are more likely to diffuse?

Which of the following is a way to increase the rate of diffusion of molecules across a membrane?

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