Table of Contents
The property of dishwashing liquid (detergent) makes it useful to wash grease from pans is its amphipathic nature.
Which of the following particles could diffuse easily through cell membrane?
Oxygen is a small molecule and it’s nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
What name is given to the process by which water crosses a selectively permeable membrane?
Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. A selectively permiable membrane is one that allows unrestricted passage of water, but not solute molecules or ions.
Which of the following affects membrane permeability?
In this article, it is shown that membrane permeability to water and solutes is dependent on the temperature, medium osmolality, types of solutes present, cell hydration level, and absence or presence of ice.
Which factors affect the rate of osmotic movement of water?
The rate of osmosis varies with a number of factors, including temperature, pressure, and the difference in solute concentrations between two solutions separated by a selectively permeable membrane.
What property of dishwashing liquid makes it useful to wash grease from pans quizlet?
What property of dishwashing liquid (detergent) makes it useful to wash grease from pans? Amphipathic nature. Detergents form micelles around the grease, which are then washed away because the polar head groups facing outward on the micelle are water-soluble.
Which of the following would be least likely to diffuse through a cell membrane?
6. Which of the following is least likely to cross a cellular membrane by simple diffusion? ANSWER: B, POTASSIUM IONS ARE CHARGED AND DO NOT PASS AS READILY THROUGH THE LIPID BYLAYER AS DO NON-POLAR GASSES AND LIPIDS.
What simple property causes molecules to diffuse from high concentration?
What simple property causes molecules to diffuse from high concentration towards a lower concentration? Molecules randomly moving causes them to spread out, balancing out concentration gradients.
Which of the following correctly describes a general property of all Electrogenic pumps?
Which of the following correctly describes a general property of all electrogenic pumps? Electrogenic pumps create a voltage difference across the membrane. Which of the following statements about cotransport of solutes across a membrane is correct?.
What really drives osmosis?
What really drives osmosis? The driving force for osmosis is water’s concentration gradient across a selectively permeable membrane. Differences in solute concentration across a membrane create water concentration differences, but solute concentration differences do not directly drive osmosis.
Is cell wall permeable?
The cell wall of a plant cell is made up of cellulose, a linear polymer of glucose. The cell wall is freely permeable and allows almost all kinds of nutrients inside the cell like water, nutrients, etc. Further, the cell membrane is semipermeable, i.e. it does not allow passage of all substances.
What is meant by semi permeability?
: partially but not freely or wholly permeable specifically : permeable to some usually small molecules but not to other usually larger particles a semipermeable membrane.
What increases membrane permeability?
Membrane Operations in Molecular Separations The membrane permeability value can be increased by increasing either the distribution coefficient or the diffusivity for the transported solute.
How surface area affects osmosis?
An increase in the surface area to volume ratio of a cell increases the rate of osmosis. Water potential determines the direction in which water can move by osmosis.
What affects osmosis?
Concentration gradient – The movement of osmosis is affected by the concentration gradient; the lower the concentration of the solute within a solvent, the faster osmosis will occur in that solvent. Light and dark – They are also factors of osmosis; since the brighter the light, the faster osmosis takes place.
Why does osmosis occur?
Osmosis occurs until the concentration gradient of water goes to zero or until the hydrostatic pressure of the water balances the osmotic pressure. Osmosis occurs when there is a concentration gradient of a solute within a solution, but the membrane does not allow diffusion of the solute.
Which of the following about osmosis is correct?
Which of the following statements about osmosis is correct? Osmosis is the diffusion of water from a region of lower water concentration to a region of higher water concentration. Osmotic movement of water into a cell would likely occur if the cell accumulates water from its environment.
Is osmosis a type of diffusion?
You can consider osmosis to be a special case of diffusion in which diffusion occurs across a semipermeable membrane and only the water or other solvent moves. Diffusion and osmosis are both passive transport processes that act to equalize the concentration of a solution.
What is Amphipathic nature?
Amphipathic is a word used to describe a chemical compound containing both polar (water-soluble) and nonpolar (not water-soluble) portions in its structure. It may also relate to a chemical compound having both hydrophobic and hydrophilic regions.
Which of the following substances would be most likely to easily pass through the lipid bilayer of a plasma membrane?
Which substance would be most likely to pass through a lipid bilayer/plasma membrane without embedded proteins? A steroid hormone (is its a small hydrophobic compound that can diffuse through the lipid bilayer).
Which of the following types of molecules are least likely to diffuse through the phospholipid?
Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot. Charged molecules, such as ions, are unable to diffuse through a phospholipid bilayer regardless of size; even H+ ions cannot cross a lipid bilayer by free diffusion.
Which of the following substances most likely would require a protein to facilitate its diffusion across a cell membrane?
Which of the following substances would most likely require a protein to facilitate its diffusion across a cell membrane? (d) oxygen gas.
Which variables affect the rate of diffusion?
Concentration gradient, size of the particles that are diffusing, and temperature of the system affect the rate of diffusion.
What happens during osmosis quizlet?
Osmosis is when water molecules travel across a cell membrane, moving to an area of higher concentration to one of a lower concentration so there is a balanced amount of water inside and outside the cell.
What molecular movements is due to diffusion or osmosis?
Water moves across cell membranes by diffusion, in a process known as osmosis. Osmosis refers specifically to the movement of water across a semipermeable membrane, with the solvent (water, for example) moving from an area of low solute (dissolved material) concentration to an area of high solute concentration.
