Table of Contents
- 1 What is the contraction or shrinking of the cell membrane of a plant cell in a hypertonic solution in response to the loss of water by osmosis?
- 2 What is it called when water diffuses through a membrane?
- 3 What causes water to move across the cell membrane either in or out of a cell?
- 4 What is the process when the cell membrane surrounds a particle and encloses it in a vesicle?
- 5 What’s hypertonic and hypotonic?
- 6 What is called hypotonic solution?
What is the contraction or shrinking of the cell membrane of a plant cell in a hypertonic solution in response to the loss of water by osmosis?
Plasmolysis is mainly known as shrinking of cell membrane in hypertonic solution and great pressure. Plasmolysis can be of two types, either concave plasmolysis or convex plasmolysis. Convex plasmolysis is always irreversible while concave plasmolysis is usually reversible.
What is it called when water diffuses through a membrane?
Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane. Water readily crosses a membrane down its potential gradient from high to low potential (Fig. 19.3) [4]. Osmotic pressure is the force required to prevent water movement across the semipermeable membrane.
What is the process of water moving from an area of low solute concentration?
Osmosis is a passive transport process during which water moves from areas where solutes are less concentrated to areas where they are more concentrated. Illustration of osmosis. A beaker is divided in half by a semi-permeable membrane.
What causes water to move across the cell membrane either in or out of a cell?
Water moves through a permeable membrane in osmosis because there is a balanced concentration gradient across the membrane of solute and solvent. The solute has moved to balance the concentration on both sides of the membrane to achieve this balance.
What is the process when the cell membrane surrounds a particle and encloses it in a vesicle?
particle, such as a large protein, and encloses the particle in a vesicle to bring the particle into the cell is called endocytosis (EN doh sie TOH sis). Vesicles are sacs formed from pieces of cell membrane. Figure 4 shows endocytosis.
What is the relationship between tonicity and osmosis?
“Tonicity is the ability of a solution to affect the fluid volume and pressure in a cell. If a solute cannot pass through a plasma membrane, but remains more concentrated on one side of the membrane than on the other, it causes osmosis.”
What’s hypertonic and hypotonic?
Solutes are the particles that are dissolved in a solvent, and together they form a solution. A hypotonic solution is one in which the concentration of solutes is greater inside the cell than outside of it, and a hypertonic solution is one where the concentration of solutes is greater outside the cell than inside it.
What is called hypotonic solution?
A hypotonic solution has a lower concentration of solutes than another solution. In biology, a solution outside of a cell is called hypotonic if it has a lower concentration of solutes relative to the cytosol.