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Ap Biology Lab 1 Questions

AP Biology Lab 1 Ross Lordo Introduction Questions 1.The solute potential would be -2.48.

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If the concentration inside the cell is . 15 M, then would diffusion out of the cell and into the solution of . 1 M. This is due to water potential and the tendency for water to move from areas of high water potential to low water potential. 2. The turgor pressure must be equal to the water potential if there is no net diffusion.

The cell and environment have reached equilibrium and the movement of water is equal on both sides. Getting Started 1. Kinetic energy is the energy an object possesses due to its motion. The difference between kinetic energy and potential energy is the kinetic energy is the energy of an object that is already in motion and potential energy is the energy possessed by an object at rest. Potential energy is stored energy, while kinetic energy is energy being exerted. 2.

Temperature can affect the rate of diffusion. If the temperature is colder, the rate of diffusion is much slower as a result of all particles becoming closer together. If the temperature is warmer, there is much more energy present and therefore allows for the diffusion to take place at a fast rate. The distance a molecule needs to travel across the membrane can also affect the rate of diffusion. If the distance across the membrane is large, then the rate of diffusion will be much slower and vise versa. 3.

A high temperature can speed up the diffusion process by providing more energy for the molecules and also for eliminating in double bonds in the phospholipid membrane. A low temperature will decline the rate of diffusion, as the particles will have less energy. The distance travelled will also affect diffusion rates. The longer the distance, the slower the diffusion is going to take place. The shorter the distance, the quicker the rate of diffusion 4. Gradients offer a pathway for molecules to go in and out of the cell.

Many molecules are to big to fit through the semipermeable phospholipid membrane and these gradients allow these large molecules to be able to cross through the cell. 5. Most cells are small because diffusion can take place at a quicker rate. The convolutions allow for more space to be able to be used in order to get molecules across the membrane. These small cells allow for materials to quickly be able to reach the cell membrane and get in or out of the cell, without having to make a long journey from an inside part of the cell. . Water will move out of the cell. The high water potential means there is little solute in the cell and more in the outside environment. In order to balance these concentrations, water moves out of the cell and creates equilibrium with the environment. 7. If saltwater is applied to a plant, the plant would shrivel up and die. This is a result of the water moving out of the cells in order to try to balance the concentration of solute compared to inside the cell.

The water movement out of the cell would cause the cell to shrink and the lack of water would eventually cause the plant to die. 8. A plant can control its turgor pressure through its central vacuole and cell wall. If a great amount of water is inside the cell, the central vacuole will take in some of the water to take some of the pressure of the cell wall. The cell wall can also eliminate water from making its way into the cell. The would cause the cell to keep expanding, but slowly eliminate its excess water.

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