Quizs- Ch 7 Passive Transport

Definition of hypertonic

• A solution with a lower concentration of solutes compared to another solution.

• A solution with an equal concentration of solutes compared to another solution.

• A solution with a higher concentration of solutes compared to another solution.

• A solution that contains no solutes.

Selectively permeable

• A property of biological membranes that allows all substances to pass equally.

• A property of biological membranes which allows some substances to pass more easily than others.

• A characteristic of membranes that prevents any substances from passing through.

• A feature of membranes that only allows gases to pass through.

Definition of hypotonic

• A solution with a higher concentration of solutes compared to another solution.

• A solution with an equal concentration of solutes compared to another solution.

• A solution with a lower concentration of solutes compared to another solution.

• A solution that contains no solutes at all.

A solution is isotonic.

• An isotonic solution has equal concentrations of solutes inside and outside the cell.

• An isotonic solution has a higher concentration of solutes inside the cell than outside.

• An isotonic solution has a lower concentration of solutes inside the cell than outside.

• An isotonic solution has no solutes at all.

identify the solute if salt is being dissolved into water.

• sugar

• sand

• salt

• oil

Movement across the cell membrane can be passive

• Passive transport means the cell does not have to expend energy; molecules are moving down their concentration gradient (from high to low concentration)

• Passive transport requires energy input from the cell to move molecules against their concentration gradient

• Passive transport involves the active movement of molecules from low to high concentration

• Passive transport is a process that only occurs in plant cells

Function of channel proteins

• Move molecules across the membrane that the membrane is impermeable to; May provide a hydrophilic tunnel through the membrane; May physically bind to a substance to move it across

• Serve as a barrier to prevent all substances from crossing the membrane

• Act as enzymes to speed up chemical reactions in the cell

• Provide structural support to the cell membrane

Discuss what is happening to the cell when it is in a HYPOTONIC solution

• A solution with a higher solute concentration compared to that inside a cell, causing the cell to shrink.

• A solution with the same solute concentration as that inside a cell, resulting in no net movement of water.

• A solution with a lower solute concentration compared to that inside a cell, causing water to enter the cell and possibly burst it.

• A solution that has no effect on the cell, maintaining its size and shape.

Equilibrium in Osmosis

• Osmosis stops when equilibrium is reached.

• Osmosis continues until equilibrium is reached, where water molecules move in both directions at the same rate.

• Water molecules only move in one direction at equilibrium.

• Equilibrium is reached when there is no movement of water molecules.

What is the ideal osmotic environment for plant cells?

• isotonic

• hypertonic

• hypotonic

• neutral