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Diffusion is the movement of molecules (gas, minerals and particles) from an area of higher concentration to an area of lower concentration. Diffusion is an important process that occurs within the cells of plants and animals. One example of diffusion is the exchange of oxygen and carbon dioxide during respiration. When we breathe in oxygen there is a higher concentration of oxygen in our lungs than in our circulating red blood cells, so oxygen diffuses across cell membranes from our lungs into our blood vessels and into our red blood cells to be distributed throughout our body. The reverse happens with carbon dioxide that we exhale. The carbon dioxide is more concentrated in our red blood cells (carbon dioxide is a by-product of cellular respiration - which we will study next) and is diffused into the lungs (lower concentration) and then we exhale releasing carbon dioxide into the environment. This carbon dioxide is taken in by plants to be used in photosynthesis.Another example of diffusion is when nutrients are taken into a plant. Plants utilize nutrients to grow and live and these nutrients are obtained by diffusion. Since nutrients are more concentrated in the soil around the roots, they diffuse into the roots and are carried throughout the plant to the various cells.Materials needed: 1 tube of food coloring (darker colors work best, but any color will do)1 large, clear drinking glass or similar containerWater (from your faucet)Procedure:1. Fill glass container almost to the top with cold water.2. Drop 3-4 drops of food coloring into the water.3. Observe for 2-3 minutes - taking photos to record the progress.4. Record your observations. How do you think diffusion helps nutrients, waste and other molecules move around the cell?
Dylan was a football player who suffered traumatic injuries. He required a surgical operation in which the surgeon would be repairing his stomach and intestine. What category of structure would the surgeon be dealing with inside Dylan's body?
The presence of blood and/or casts in the urine can indicate a serious kidney problem. Why are kidney problems so serious?
After taking samples of HIV RNA sequences from two infected patients, you plot nucleotide differences over 500 generations. You calculate a y-intercept of -5 and a slope of 0.02.
Determine how to calculate osmolality for an electrolyte versus nonelectrolytes and molality versus osmolality.
List four conditions that facilitate the precipitation of calcium carbonate in the ocean and explain how each of these conditions is related to the healthy growth of the hermatypic corals.
Create a diagram of the explanation in the paragraph. I recommend that you attempt each problem on your own, then meet with your classmates to discuss possible answers.
Which characteristic of cell membranes might explain why fat-soluble substances such as chloroform and ether rapidly affect cells.
Why is the pharmacological reactivation of fetal hemoglobin in a patient with sickle cell anemia often a successful treatment?
When yellow mice are crossed with albinos, they produce F1 mice consisting of ½ albinos, ? yellow and 1/6 agouti. What are the possible genotypes of the parents.
If a cell were treated with an inhibitor that would cause microtubules to fall apart, which of the following would NOT be affected?
1. Why is the Haplorhine/Strepsirrhine split a more accurate way of categorizing primate taxonomy than the Prosimian/Anthropoid split?
Two statements that introduce the problem that your hypothesis is addressing. This problem may have to do with specie introductions, or pollution, or a question of natural history strategies, etc.
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