outer surface that separates the internal from outer region. Semi permeable membrane – selective barrier Structure of the Cell Membrane – “Fluid Mosaic Model” Fluid Mosaic Model Ever moving sea of fluid lipids that contains biomolecules carbohydrates and proteins Lipid Bilayers -phospholipids -cholesterol -glycolipids Osmosis The passage of water from a region of lower solute concentration through a semi-permeable membrane to a region of high solute concentration. There are two
Premium Red blood cell Osmosis Cell membrane
Osmosis is only the diffusion of water molecules through a selectively permeable membrane and a concentration gradient. Only certain molecules can cross the membrane
Premium Osmosis Diffusion Chemistry
using the ornithine cycle. This is because urea is less toxic than ammonia and requires less water for elimination‚ meaning urine can be produced and excreted from the body. Moreover‚ urea is a very small molecule and can easily diffuse across permeable membranes such as the capillaries in the glomerulus. The kidney contains numerous functional units called nephrons‚ which produce urine through a series of steps: ultrafiltration of the blood; selective reabsorption of the filtrate and secretion
Free Kidney Nephron Ammonia
I was the meanest‚ richest and smartest boy in my Primary Four class. Being a notorious bully‚ students cowered at the mere mention of my name. Without any reason‚ I would start bullying other students. I always had a bag of tricks up my sleeves‚ so my ‘attack’ on my ‘victim’ would come unexpectedly. I always had a sense of satisfaction after successfully bullying a student. It was like another feather in my cap. Others’ misery was my happiness. On one typical Monday recess‚ I caught sight of
Premium Bullying English-language films
The next two questions refer to the diagrams below representing an organelle from a cell. Question3: The organelle in the diagram is: a) The nucleus of a cell b) A Mitochondria c) Part of the cell membrane d) A golgi body Question 4: The function of this organelle is to: a) Control the metabolism of the cell b) Modify proteins by adding a glycoprotein c) Synthesis proteins d) Package molecules into vesicles before secreting them from
Premium Cell Bacteria Organelle
much smaller than the phospholipids. Osmosis Osmosis is the movement of water molecules from an area of high water concentration (weak/dilute solution) to an area of low water concentration (strong/concentrated solution) through a partially permeable membrane. The Effects of Osmosis 1. If the water concentration of the cells cytoplasm is lower then that of the medium (i.e. the medium is a hypotonic solution) surrounding the cell then osmosis will result in the cell gaining water. The water
Premium Cell Cell wall Cell membrane
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
Premium Osmosis
hypothesis for weight change because weight is not impacted by temperature. The statistical test used results that did not show that the lipid bilayer portion of the membrane of living cells is not permeable like the dialysis membrane used in the lab. The dialysis membrane used in the lab is permeable to small ions like Na+ and Clˉ. The experiment was also performed in a “closed system” which is not reflected in the statistical test. The results of the statistical test does however support our hypothesis
Premium Hypothesis Null hypothesis Statistical hypothesis testing
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.[1][2][3] It may also be used to describe a physical process in which any solvent moves‚ without input of energy‚[4] across a semipermeable membrane (permeable to the solvent‚ but not the solute) separating two solutions of different concentrations.[5] Although osmosis does
Premium Osmosis
of many of the processes that occur inside cells in both eukaryotic and prokaryotic cells as well as animal and plant cells. The movement of substances may occur across a semi-permeable membrane such as the phospholipid bilayer membrane on the outside of a cell in the digestive tract of an animal. A semi-permeable membrane allows some substances to pass through‚ but not others. The substances‚ whose movements are being described‚ are made up of a solvent and the substance dissolved in the solvent
Premium Cell Cell membrane Bacteria