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Bio Chapter 7
Diffusion/Osmosis
26
Biology
9th Grade
11/28/2012

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Term
Diffusion
Definition
Net movement of a substance from a region of greater concentration to lower concentration
Term
Passive Transport
Definition

transport of a substance across a cell membrane by diffusion

Expenditure of energy is not required

Term
Osmotic Pressure
Definition

The pressure of water on the cell well

Caused by different concentration differences in solutes

Term
Turgor Pressure
Definition

The pressure of the cell's contents against the cell wall

Determined by the water concent in the central vacuole

Water pressure in a plant

Term
Facilitated Diffusion
Definition
The movement of molecules across cell membranes through protein channels and carrier proteins
Term
Glucose Permease Protein Channels
Definition

Glucose permease is the transporter protein specially designed to facilitate the membrane crossing of glucose

Specific to shape of glucose; like a lock, need right shape key


Term
Selectively Permeable Membrane
Definition

A membrane that only certain size molecules can enter and leave

Cell has limited control over what enters and leaves

Term
Osmosis
Definition
WATER passes through a selectively permeable membrane from region of higher concentration to lower
Term
Permeable Membrane
Definition
Allows all substances to pass through
Term
Solvent
Definition

Liquid in which solutes dissolve

Water is the universal solvent

Term
Solute
Definition

Lesser concentration particles that dissolve in solvent

Acids

Term
Hypertonic Solution
Definition

Over active

More solutes

Less solvent; water

 HYPO TO HYPER

Term
Hypotonic Solution
Definition

Under active

Less solutes

More solvent; water

HYPO TO HYPER

Term
Isotonic Solution
Definition

Same concentration of solutes

Same solution

Term
Factors determing whether substance can pass through membrane
Definition
  1. Concentration Gradient - when there is an uneven distribution of a substance across a border
  2. Molecular Weight - Molecular weight is simply the weight of all the atoms in a substance
  3. Solubilitythe maximum amount of a solute which will dissovle in a given amount of solvent at a fixed temperature
Term
Diatoms
Definition

The most important producer 

Live in ocean

Can be found on glass shells

Term
Factors Determining Permeability
Definition
  1. Solubility in water - can in dissolve in water
  2. Solubility in lipids
  3. Phase of matter - gas, liquid, solid
  4. Electrical charge
  5. Shape
  6. Molecular weight (size) - atomic mass units

Biggest molecule is DNA

Term
Crenated
Definition
Animal cell shriveled up
Term
Lysed
Definition
Animal cell swelled up
Term
Plasmolysed
Definition
Plant cell shriveled up
Term
Turgid
Definition
Plant cell swelled up
Term
Motion after equilibrium
Definition

Matter is always in motion

Back and forth equally

Term
Plasmolysis
Definition
Excessive cell water loss
Often leads to death of plant
Term
Active Transport
Definition
Diffusion requiring cell energy (ATP)
Against concentration gradient
Term
Endocytosis
Definition
Taking in of matter by a cell
Entering cell
Phagocytosis - wherein large particles are enveloped by the cell membrane of a (usually larger) cell and internalized to form a phagosome, or "food vacuole."
Pinocytosis - a process in which small particles are taken in by a cell by splitting into smaller particles
Term
Exocytosis
Definition
Waste leaves the cell
A process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane
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