Essays Tagged: "Semipermeable membrane"

Biology experiment on osmosis for gcse very good got an A* as course work so do not miss out

in different salt concentrationIntroduction:Osmosis is a movement of water across a semi-permeable membrane. This may only happen when there is a difference in concentration between the two sides of ... isOsmosis is the process of the flow of one constituent of a solution (in this case salt) through a membrane while the other constituents are blocked and unable to pass through the membrane. Experimen ...

(15 pages) 314 2 4.2 Mar/2002

Subjects: Science Essays > Biology > Plant Biology

"Experiment to investigate the effect of osmosis in potatoes" A GCSE experiment looking at the effects of the concentration of sucrose solution on osmosis in potato tubers.

Osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to a region of low water concentration. This definition contains three important statements ... finition contains three important statements:a) It is the passage of water through a semi permeable membraneb) It is the passage of water from a region of high water concentrationc) It is the passage ...

(11 pages) 191 1 4.7 Jan/2003

Subjects: Science Essays > Biology

Experiment with Diffusion, Osmosis, and Hypertonic Solution. Discusses what each is, along with how the experiment was done in a lab.

oncentration is called Diffusion. Osmosis is the diffusion of water through a selectively permeable membrane from an area with greater concentration of water to an area with less concentration. A Hype ... cules than another solution is called a Hypotonic Solution. A cell that has a Selectively Permeable Membrane has a plasma membrane that allows certain substances to pass through more readily than othe ...

(2 pages) 149 2 4.6 Aug/2003

Subjects: Science Essays > Biology

Investigating osmosis - coursework for biology includes prediction evaluation and results

tionOsmosis is defined as ¡§the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration¡¨ ... e called a strong or concentrated solution. When two such solutions are divided by a semi-permeable membrane the water will move from the area of high concentration to the area of low concentration, u ...

(4 pages) 64 0 3.0 Nov/2003

Subjects: Science Essays > Biology

Biology Practical to study the Osmosis effects of Sucrose solutions of different Molarities upon Plant Cells (Chinese Radish and Potato Chips)

s to investigate the movement of water by osmosis in and out of plant cells across a semi permeable membrane in sucrose solutions of different concentrations. The plant cells used in the experiment ar ... sed as chips because the results and changes are easy to note and record in this way. As plant cell membranes are differently permeable, different results are expected from the Chinese radish and pota ...

(26 pages) 78 0 2.3 Jan/2004

Subjects: Science Essays > Biology > Plant Biology

This is a assignment on lipids

ructure, to which each of the following statements refers:a)Fully permeable layer found outside the membrane of some cells. Cell Wallb)Series of membranes in the cytoplasm through which materials can ... iculumc)Site of ribosomal RNA synthesis. Nucleusd)Partially permeable layer about 7.5nm thick. Cell Membranee)Structures responsible for producing spindle apparatus. Centrosomesf)Contains membrane sta ...

(4 pages) 43 1 2.3 Feb/2004

Subjects: Science Essays > Biology

Aim to investigate water relations in two plant tissues

n area of higher water potential, to an area of lower water potential through a partially permeable membrane. At some point, the molecules will be equal on either side of the membrane. This is known a ...

(7 pages) 30 0 4.4 Feb/2004

Subjects: Science Essays > Biology

The effect on Potato in Salt Solution. J de Salles

ugh xylem vessels.Osmosis is the flow of water molecules by diffusion through a partially permeable membrane from areas of high water potential (low solute concentrations) to regions of low water pote ... olute concentrations) to regions of low water potential (high solute concentrations).All plant cell membranes are partially permeable, which means they allow some some substances to penetrate them but ...

(6 pages) 44 0 4.0 Apr/2004

Subjects: Science Essays > Biology

Finding the concentration of a Potato cell.

f sucrose solution.Background informationOsmosis is diffusion of water across a partially permeable membrane. It moves from a solution with less solute concentration (high water potential) to a soluti ... but these only depend on what type of concentration is on the other side of the partially permeable membrane. When more water passes through to one side of the membrane it is called net movement.(Tool ...

(12 pages) 54 0 5.0 May/2004

Subjects: Science Essays > Biology

Investigation to find the effect of different concentrations of sugar solutions on osmosis

an area of high water concentration to an area of low water concentration, across a semi-permeable membrane' (Collins, 1999).If you get information from books put the copied text in brackets and at t ... be called a strong or concentrated solution.When two such solutions are divided by a semi-permeable membrane the water will move from the area of high concentration to the area of low concentration, u ...

(5 pages) 34 1 4.4 Jan/2005

Subjects: Science Essays > Biology

AT1- Osmosis In Potatoes

Aim: Investigate the movement of osmosis through a selectively permeable membrane, in this case potato.Introduction: Osmosis is the movement of water through a semi permeabl ... n of low concentration, until the two concentrations are equal in concentrations of water.Many cell membranes behave as semi permeable membranes, and osmosis is a vital mechanism in the transport of f ... water concentration than its own contents, then water leaves the cell by osmosis, through the cell membrane. Water is lost first from the cytoplasm, then the vacuole through the tonoplast. The living ...

(8 pages) 33 0 3.0 Jan/2005

Subjects: Science Essays > Biology

A GCSE essay on the effects of osmosis on potato chips in different molar solutions

of high water concentration to a region of low water concentration through a selectively permeable membrane.The diagram below shows how water molecules move through the selectively permeable membrane ... tion to the region of low water concentration until the concentration is equal on both sides of the membrane.Water moves between cells in plants by osmosis. Instead of measuring percentage change in m ...

(4 pages) 27 0 2.1 Feb/2005

Subjects: Science Essays > Biology

The Lab Report. The rate of ossmosis and the surface area.

t of water molecules from high concentration to a low concentration; and of course a semi-permeable membrane is required for keeping the concentration difference. So it's the movement of molecules of ... ater along the "concentration gradient (from high to low concentration)" through the semi-permeable membrane. So the rate of osmosis is "change in concentration(moles) /time(seconds)"Now the concentra ...

(6 pages) 80 0 4.0 Jun/2005

Subjects: Science Essays > Biology

Investigating Osmsosis - GCSE Coursework.

Planning.Osmosis is the diffusion of water molecules across a semi-permeable membrane. Diffusion is the movement of molecules from an area of high concentration, to an area of l ... concentration in salt, the more water particles will move through the potato cell's semi-permeable membranes to try and balance the salt concentration. For example, if you placed a larger piece of po ... the higher the salt concentration, the more particles move through the potato cell's semi-permeable membranes to try and balance out the salt concentration in the surrounding test tube. As a direct re ...

(3 pages) 20 0 1.0 Oct/2005

Subjects: Science Essays > Biology

Biology - The Movement of Molecules

Every cell is surrounded by a plasma membrane. The cell membrane is selectively permeable- only certain substances can cross it freely. T ... concentration gradient. Water, carbon dioxide and other small ions can diffuse freely through cell membranes. Concentration gradients occur in all organisms. Where they do, simple diffusion will tran ... usion occurs when substances move down the concentration gradient by "carrier proteins" in the cell membrane.Osmosis is also a type of passive transport involving the diffusion of water molecules acro ...

(2 pages) 30 0 5.0 Feb/2006

Subjects: Science Essays > Biology

How do different sugar solutions effect osmosis in a potato chip?

rt. This means that it is a process that does not need any energy to take place.Partially permeable membranes (or sometimes called semi-permeable membranes) are very thin layers of material that allow ... rea of high water concentration to an area of low water concentration through a partially permeable membrane or in terms of the solute, Osmosis is a name used to describe the movement of water from an ...

(16 pages) 28 0 3.0 Jun/2006

Subjects: Science Essays > Biology

Demostrating Osmosis - Science Probe 10

t sugar can not move out because it is cannot do osmosis.5. The dialysis tubing is a semi-permeable membrane, like a cell membrane.6. I think that the water in the beaker would go through the bag, but ...

(1 pages) 695 0 0.0 Sep/2006

Subjects: Science Essays > Biology

Active and Passive Transport

oxygen into the cellsand carbon dioxide out of the cell. Osmosis is the diffusion of water across a semipermeablemembrane. It occurs because of the concentration of a solute in a solution. In a hypert ...

(2 pages) 35 0 3.7 Sep/2006

Subjects: Science Essays > Biology > Plant Biology

What happened to the Romanov family?

smosis.OSMOSIS.Definition - Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration.About osmo ... high water concentration to a region of low water concentration.About osmosisA partially permeable membrane is a membrane with many minute holes in it. These holes are so small; of water molecules ma ...

(6 pages) 24 0 5.0 Apr/2007

Subjects: History Term Papers > European History

9 year old boy with testosterone disorder

tient.Free testosterone has been estimated from the serum for some time by dialyzing serum across a semipermeable membrane with the testosterone that crosses in the serum believed to be the unbound po ...

(5 pages) 1992 0 0.0 May/2009

Subjects: Science Essays > Biology