3. How will the concentration of sucrose in water affect the amount of water that diffuses into or out of the potato cells and thereby change the mass of the potato cells? Hypotheses: 1. If the solution inside the dialysis tubing is hypertonic to the water in the beaker, then the glucose will diffuse out of the bag, and the water will diffuse into the bag, however the starch will remain in the bag. This will occur because the water and glucose are small enough to diffuse out of the pores in the dialysis bag, but the starch molecules are too large to fit through 2.
Diffusion is the passive movement of molecules or particles along a concentration gradient, or from regions of higher to regions of lower concentration. Osmosis is diffusion of a solvent (usually water molecules) through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration. Tonicity of a solution, usually water, determines how the cells of plants or animals will look and behave; if the solution contains too much saline, then the cells will become dehydrated and appear flaccid, but if there is too much liquid and not enough saline to rid the cell of excess liquid, then the cell will appear lysed, and has the potential to pop when it is in that state. The experimental hypothesis for this experiment is that if a solution had a concentration gradient across a barrier, then movement will occur because molecules are small and/or uncharged. The null hypothesis for this experiment is that if a solution has a concentration gradient across a barrier, then movement will not occur because molecules are small and/or charged.
A) is neutralized by water B) is surrounded by water molecules C) reacts and forms a covalent bond to water D) aggregates with other molecules or ions to form a micelle in water Answer: B Page Ref: Section 3 11 9) Which would you expect to be most soluble in water? A) I B) II C) III D) IV Answer: A Page Ref: Section 3 10) Solutes diffuse more slowly in cytoplasm than in water because of A) the higher viscosity of water. B) the higher heat of vaporization of water. C) the presence of many crowded molecules in the cytoplasm. D) the absence of charged molecules inside cells.
It is important to correct the readings from the peas because the glass beads are used as a control in which no changes should occur in CO2 and oxygen levels due to their abiotic nature. 3. For both plants and animals, cellular respiration occurs not only during the daytime but also at night. However, cellular respiration cannot occur if there are not enough reactants to carry out the process. For example, because plants supply an abundant amount of oxygen to the atmosphere, it would be difficult for living cells in humans to respire if plants were ever to be demolished from Earth.
If the environment was hyperosmotic then an osmoregulator must intake water in order to survive (Campbell, 2008). When N. succinea are put into an environment not natural to their habitat, it can affect their cells in two ways which at extremes could cause the cells to shrink or swell up and burst. When a cell is placed in a hyperosmotic solution, it tends to shrivel up
These plants do not live near the sea normally. Many plants cannot live in soil with high salt content. Salt is called an abiotic factor because it is a non-living factor. Salinity lowers their ability to absorb water and they die. We will experiment to see if beans can be grown in a soil with varying levels of salinity (salt).
Homeostasis can shut down causing imbalance of water, pH balance and ionic equilibrium, all factors of homeostasis in individual cells. F. Why was reestablishing oxygen flow to Joseph’s body so important? What processes would be affected by lack of oxygen? Without oxygen the cells would not work and ultimately die. All processes in the
Changes in pH break the delicate bonds that maintain an enzyme's shape. An enzyme will unravel, or denature, and become useless in a different pH. The FDA should not approve this enzyme to be safe for people. I say this because for the FDA to approve it, Lactex must be able to survive a wide range of pH and temperatures that it will be exposed to within the digestive tract. The path a drug travels from a lab to your medicine
If the leaves were to be kept longer for observation then the leaf with vaseline at the bottom would have died shortly too. The leaf that was fully covered in vaseline would probably survive longest since there is absolutely no escape of water but blocking the stomata would prevent the intake of carbon dioxide which is a need for the plant to
Why would add salt solution to a plant cell to help see the cell membrane? ans: Plant cells have a stiff cell wall, the cell will not appear to shrivel as an animal cell will. Instead, the cell wall remains in place, but the contents of the cell, most noticeably the chloroplasts, seem to bunch up in the center of the cell, leaving an empty space between the cell contents and the cell wall. This separation of the cell membrane from the cell wall and subsequent concentration of the cell contents is due to loss of turgor pressure inside the membrane as water moves out of the cell, toward the higher salt concentration. This process is called plasmolysis.