Get Full Essay Get access to this section to get all help you need with your essay and educational issues. Describe two variables that affect the rate of diffusion. Size of material and concentration 2.
These intermittent jackpots keep me going. The other day I was meandering the web looking for new ways to teach about membranes, the cellular variety.
In my opinion, cell membranes can often be over looked. Open a student textbook and find a diagram of a cell.
The membrane is often drawn as a simple line, unassuming and uneventful. In reality, the cell membrane is abuzz with a flurry of activity. In my search I was hoping to find something tangible for my students to experience that might reveal the dynamic and adaptive nature of cell membranes.
To my pleasure, I came across something that does an excellent job modeling membranes, soap bubbles.
The Beauty of Bubbles I like to rate instructional activities on three attributes: The cell membrane bubble lab scores well across the board.
First, blowing bubbles is pretty easy — ask any preschooler. Second, a bubble acts a lot like a cell membrane — you just have to know what to look for. A major component of cell membranes is phospholipids. Phospholipids have a love-hate relationship with water.
Place phospholipids in water, and they quickly form a double layer with the heads facing out. A soap molecule has the same split personality.
This explains why we use soap to clean. The hydrocarbon tail of soap mixes with and dissolves in other hydrocarbons, like oils and fats, while the head region grabs a hold of passing water molecules and follows them down the drain.
The surface of a bubble has three layers. The middle layer is a thin film of water. On both sides of this film is a layer of soap molecules with hydrophilic heads facing water and hydrophobic tails pointing out.
The diagram below provides a nice illustration of this comparison. Diagram comparing the structure of a bubble with that of a cell membrane.
The following two tabs change content below.And membrane transport is one of the main keys to cell physiology when we study the nervous system and the digestive system.) Preparation I. Background and Protocol Explanation of Terms. Study Physiox exercise 1 - cell transport mechanisms and permeability flashcards taken from the book Human Anatomy and Physiology Laboratory Manual, Fetal Pig Version, Update.
The Clean Hydrogen in European Cities (CHIC) Project was the crucial next step for the full commercialisation of hydrogen powered fuel cell buses.
The project commenced in with an initial 25, subsequently 23 partners from Cities, Regions, Industry and Research Organisations.
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hypotonic and hypertonic solution give different effect on the plant cell whether it shrinks.3/5(2). Transport 8 Chapter 8 8 5 Climate change feedback and interaction with adaptation 8 5 1 Accessibility and feasibility of transport routes