Active transport is the process where dissolved molecules move across the cell membrane from a lower to a higher concentration. The particles involved in active transport move against the concentration gradient, this means there needs be an input of energy from the cell. It may occur that the dissolved molecules are sometimes at a higher concentration inside the cell than outside, but as the organism needs the molecules they must still be absorbed. Active transport is highly selective, proteins are pumps ( carrier proteins) that use energy (ATP) and pick up specific molecules that are then taken through the cell membrane against the concentration gradient (one direction only). It is also know as 'uphill transport.'
The two types of passive transport are diffusion and osmosis. Diffusion is the movement of materials down a concentration gradient from an area of high concentration to an area of lo concentration. Osmosis is the diffusion of water(movement of water down a concentration gradient from an area of high concentration to an area of low concentration. Both types of passive transport continue until equilibrium(the material or water is equal in all areas) is reached. When a solution a cell is placed in has more more atoms than the cell has the solution is known as a hypertonic solution while a solution holding less water than the cell it is known as a hypotonic solution.
This is a diffusion where the movement of water from an area of high water concentration is moved to an area of low concentration. This experiment takes place to measure the diffusion of small molecules throughout dialysis tubing. This tubing acts as a selectively permeable membrane, allowing the larger molecules to pass through, but slowly. When the two solutions on either sides of the membrane are equal and no net movement is detected, the solutions are isotonic. This means that the solutions have the same concentration of solutes.
2. Define osmosis. Diffusion of fluid through a semipermeable membrane from a solution with a low solute concentration to a solution with a higher solute concentration until there is an equal concentration of fluid on both sides of the membrane. 3. What is the main difference between osmosis and diffusion.
All rights reserved Write the Ksp expression for each of the following reactions and find its value in the table above. CaF2(s) Ag2SO4(s) Bi2S3(s) Ca+2 + 2 F−
Unit 2 Assignment Ashley Hanzlik Kaplan University A lipid is a fat-soluble molecule or a class of naturally-occurring organic compounds. We best known lipids by their common names: fats and oils. Lipids are insoluble in water but soluble in at least one organic solvent. They do not share a common molecule structure. Lipids main function is to store energy.
3. Why are some ions more attracted to water molecules than to each other in solution than other ions? 4. What is the trend of forming a precipitate? Safety Considerations Wear proper PPE: gloves, goggles, covered legs and feet.
Respiration has three steps you have the Glycolysis, Krebs Cycle, and Election Transport Chain. The glycolysis is outside the mitochondrion and then the krebs cycle happens in the matrix and the election transport chain happens in the inner membrane. Photosynthesis and respiration are reactions that complement each other in the environment. They are the opposite of each other. They work well
Protein channels allow molecules that are too big to pass through the carrier proteins to enter in and out the cell via a tube shaped molecule via diffusion which requires a concentration gradient but then sometimes the molecules are too big to go through and therefore undergo facilitated diffusion, however carrier proteins only allow certain molecules with a complementary shape to the binding site of the carrier protein to enter using ATP as the main sources of energy. Substrate (molecule to move across the
Introduction Biological membranes are selectively permeable allowing molecules to move across by means of osmosis and diffusion. The ability of a molecule to move across the membrane depends on charge and size of the molecule and the concentration of molecules on either side of the membrane. In this experiment two types of membrane transport will be studied: osmosis and diffusion. This experiment will also investigate how surface area to volume ratio effects the amount of molecules that can diffuse across the plasma membrane (Biology Department. 2012).