The polar heads will interact with water as they are hydrophilic, though the tails/fatty acids are never exposed to water therefore they are hydrophobic (Wisegeek.com/bilayer. 2011). Water itself is polar, and the dual nature of the phospholipid bilayer causes it to arrange itself in such a way that the polar head interacts with water and the non-polar tails to avoid water (Wisegeek.com/bilayer. 2011). The bilayer is selectively permeable which enables it to act as a barrier that keeps proteins, ions and other molecules where they are needed and prevents them from diffusing into areas where they are not (Wisegeek.com/bilayer.
Hypotonic means less salute and more water. For this lab, we can apply these principles to plant cells. The plant cells have a semi permeable membrane so they can experience osmosis and diffusion as discussed earlier. When it comes to the potato cells, added with NaCl (salt) it will experience a reaction changing the form of the cells. The hypothesis of this experiment goes as follows, If we place potato cells in a salt solution, then the cells will shrink.
LB+:There should have been bacterial growth but no blue colonies because there was an anti-biotic acting against it. LB-: Nothing should have happened because there was no bacteria and plasmid given. 3. One of the plates should have no growth and that was the LB- plate. This happened because the plate was given no bacteria or anything to start growth.
If we place the potato in a sucrose solution with a similar solute concentration as a potato, then the least amount of water will diffuse into or out of the potato cells. This occurs because this scenario will be initially closest to an isotonic solution, allowing us to determine the solute concentration of a potato. Materials: * Knife/ Cork Borer * Seven 30 cm pieces of Dialysis tubing * Thirteen 250 mL Beakers * 15% Glucose Solution * Glucose Test Strips * 1% Starch Solution * Distilled water * Lugol’s solution * 25 mL of: * .2 M sucrose * .4 M sucrose * .6 M sucrose * .8 M sucrose * 1 M sucrose * Paper Towels * Clock * Potatoes * Plastic
3. Why is it necessary to make pure subcultures of organisms grown from clinical specimens? So that the organism can be identified and tested for antibiotic sensitivities. 4. What kinds of clinical specimens may yield a mixed flora in bacterial cultures?
Only the enzyme will fix the substrate because of the active sites on the enzyme. Once locked together, the enzyme can break down the substrate (Hudon-Miller, 2012c). An example of this is Sucrose. Sucrose is considered a regular table sugar. It is composed of two monosaccharaides: glucose and fructose.
September17.2013 P.4 Environmental Sources Of Bacteria Purpose: We did this lab to find out exactly which conditions would help to grow a bacterium the best. Materials: • Agar • Petri dish • Cotton • Incubator • Tape • Bacteria Procedure: 1. Mark bottom of Petri dish 2. Split petri dish into 4 sections and label the sections 3. Pour hot agar into dish 4.
Processes such as gram staining can be used in conjunction with monitoring the growth of a bacteria to further reinforce a hypothesis. Materials and Methods: Materials Streptomyces and Antibiosis The following materials and apparatus were used to complete the study of Streptomyces and its antibiotic properties. Soil samples were collected from the pond on the Brooklyn College campus,
Describe the digestion and absorption of carbohydrates and the regulation of blood glucose Carbohydrate is a polymer made up of monomers called glucose. There are two types of glucose namely alpha glucose and beta glucose. Carbohydrate is the main substrate which produces energy for any mechanism such as metabolic reactions, active transport and the movement of vesicles. In living organism such as human, carbohydrate is stored as glycogen where mostly be found in muscle. However, glycogen cannot diffuse through the phospholipid bilayer of the cell membrane so it must be broken down into smaller molecules known as glucose which can diffuse through the glucose co-transport channel protein spun across the phospholipid bilayer.
Strategy For this coursework, I will be investigating the following question: ‘How do different concentrations of salt solutions affect the mass of the potato after the process of osmosis?’ Osmosis is the movement of water particles from a high concentration of water particles to a low concentration across a partially permeable membrane. A partially permeable membrane is a membrane that acts as a barrier to some molecules but allows others to freely diffuse through. The partially permeable membrane of cell membranes prevent large molecules such as Sucrose, protein and starch to pass through but allow smaller molecules such as oxygen, carbon dioxide and water, glucose and amino acids to proceed. In this coursework we will be using potato to test the rate of osmosis. If the area around a cell has a higher water concentration it will gain water by osmosis.