INTRODUCTION Osmosis is the movement of water molecules from high concentration to low concentration through semipermeable membranes‚ caused by the difference in concentrations on the two sides of a membrane (Rbowen‚ L.). It occurs in both animals and plants cells. In human bodies‚ the process of osmosis is primarily found in the kidneys‚ in the glomerulus. In plants‚ osmosis is carried out everywhere within the cells of the plant (World Book‚ 1997). This can be shown by an experiment with potato
Premium Concentration Osmosis Solution
B04 onion skin lab SNC 2D Name:______________________________ Lab: Investigation of the Structure of Onions Cells Purpose: To investigate the structure of onion cells and become familiar with some of the basic parts of a cell. This lab will also introduce you to the technique of preparing a wet mount slide. Materials: microscope pencil cover slips lens paper paper towels blank white paper ruler known field of views beaker tweezers glass slides eraser medicine dropper
Premium Laboratory equipment
Animal cells do not have a cell wall. Instead of a cell wall‚ the plasma membrane (usually called cell membrane when discussing animal cells) is the outer boundary of animal cells. Animal tissues therefore require either external or internal support from some kind of skeleton. Frameworks of rigid cellulose fibrils thicken and strengthen the cell walls of higher plants. Plasmodesmata that connect the protoplasts of higher plant cells do not have a counterpart in the animal cell model. During telophase
Premium Cell Cell wall Eukaryote
Title: To examine an animal and cheek cell using a compound microscope Date: 25th September 2012 Lab Partner: xxxxxxxxxxxxx Objective: The main aim of this experiment was to prepare a wet mount of human cheek cells and a wet mount of plant cells and examine them both under a compound microscope. Introduction: Cells are the basic units of life which make up every structure in the human body. They are the smallest units which are living. All cells contain different organelles which
Free Cell Eukaryote
Osmosis is the spontaneous net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration‚ in the direction that tends to equalize the solute concentrations on the two sides. It may also be used to describe a physical process in which any solvent moves‚ without input of energy‚ across a semipermeable membrane separating two solutions of different concentrations. Although osmosis does not require input of energy‚ it does use kinetic energy and
Premium Osmosis Membrane biology Semipermeable membrane
Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated solution – down the water potential gradient) Note: diffusion and osmosis are both passive‚ i.e. energy from ATP is not used. A partially permeable membrane is a barrier that permits the passage of some substances but not others; it allows the passage of the solvent molecules but not some of the larger solute molecules. Cell
Premium Osmosis Cell wall Cell membrane
Planning AIM Beetroot cells contain a red pigment‚ which is stored in the cell vacuole and a vacuole membrane to prevent this leaking out of the cell surrounds it. The outer of the cell is also surrounded by a membrane‚ which again helps contain the pigment inside the cell. In this experiment I aim to find out the relationship between the leakage of red pigment from a beetroot cell and the surface area. To do this successfully I will need to alter the surface area of the beetroot cells accurately and then
Premium Cell membrane Cell Surface area
Argument Essay Animal Testing: Behind the Experiments Cruel‚ inhumane‚ and unnecessary. Those are just a few of the terms that come to mind when I think about animal testing. Animal testing has been a heated topic of debate for many years‚ throughout classrooms and medical facilities alike. In many cases‚ animal testing has proven to be a rather inaccurate method for testing human medications and cosmetics. For example‚ in the book‚ Animal Research Takes Lives: Humans and Animals Both Suffer by
Premium Animal testing
Investigation: A factor that affects the movement of water in and out of cells. Osmosis: movement of water from a region of high water potential to a region of low water potential through a partially permeable membrane. High water potential = lots of free water molecules‚ low solute concentration Low water potential = very few free water molecules‚ high solute concentration Factors That Affect the Movement of Water in and out of Cells * Solute concentration * If one solution has low solute
Premium Osmosis
Should experiments on animals be illegal? Answer byDr Drake708 It is definitely something that should not be legal‚ I don’t think any way you look at it it’s an okay thing to do‚ most animals die‚ or become sick and very ill‚ deformed‚ or loose hearing‚ site‚ voice‚ and fur. They think it’s okay to test on animals because they are merely animals and have no say. They don’t choose to be test objects‚ they breathe‚ eat and sleep just like normal people. They feel‚ they have feelings. Things hurt them
Premium Animal testing Suffering Animal