Oils and fats should be eaten sparingly but they are still important in our diet because they are needed in our body to maintain the cell membrane structure. The energies given in a can of soda (12 oz) is only 4 calories which is 15 kilojoules. For a teen girl or teen boy, we need 10,000 kilojoules and 12,000 kilojoules respectively per day. Any overeaten food will be store as fat in our body. Someone believe that diet soda is healthy because it is with low or even none calories which makes us not easy to gain weight comparing to drinking regular soda.
Yeast can metabolize sugar in two ways, aerobically, with the aid of oxygen or anaerobically without oxygen. The net equation for more than two dozen steps involved in the aerobic respiration of glucose is: C6H12O6 (aq) + 6O2 --> 6H2O (g) + energy (36-38 ATP + Heat) But when yeast ferment sugars anaerobically, CO2 production will cause a change in the pressure of a closed test tube system, since no oxygen is being consumed. We can monitor this pressure as an indication of the rate of anaerobic respiration & metabolic activity of the organism. A gas pressure sensor will be used to monitor the fermentation of the sugar. The net equation for the ten steps involved in anaerobic respiration of glucose is: C6H12O6 (aq) --> 2CH3CH2OH (aq) + 2CO2 (g) + energy (2 ATP + Heat) Both alcoholic fermentation and aerobic respiration are multi-step processes that involve the transfer of energy stored in the chemical bonds of a metabolite (usually glucose) to bonds in ATP (Adenosine Triphosphate).
Results Information such as data, graphs, calculations, etc. are recorded in www.chem21labs.com. Discussion The sugar concentration should change with the higher depression. One of the sugar concentration solutions should have an equal molality to salt solution. The biggest flaw of the experiment was that the experimenters did not match any masses of sugar with the mass of salt.
3, 2 4. Solutes that require active transport for movement might be too large to pass or might be You correctly answered: a. lipid insoluble. 01/31/15 page 1 Experiment Results Predict Question: Predict Question 1: What do you think will result from these experimental conditions? Your answer : b. Na+ will be partially transported Predict Question 2: Do you think the addition of glucose carriers will affect the transport of sodium or potassium? Your answer : d. No, it will not affect the transport of either ion.
A plant whose cells are in a hypertonic solution will appear droopy because there is a loss of turgor pressure in each cell. When the concentration of water is the same in the cell and the solute the cell is said to be isotonic and is at equilibrium. There is no net movement of water across the membrane. (Biology Department, 2010). Surface area to volume ratio has a direct effect on the amount of water (as well as nutrients and waste) that can diffuse through the plasma membrane.
1.2- Important factors affecting osmosis and diffusion would be how concentrated the solution or solute is, the temperature that the environment or the solution is. What your using and also how large the particle is. 1.3- Aim: The aim of the experiment is to document a rhubarb cell under a microscope, using different concentrations of salt-water solution to determine how much the cell decreases in size, volume and shape and to record the difference in cell reduction. (2) 1.4- Hypothesis: This experiment we expect that the rhubarb cells will drastically shrink with the higher concentrations of salt-water solutions. 1.5- Before starting this experiment we didn’t know how drastically the rhubarb cell would shrink, or if this experiment would actually be a success.
Using a single-lumen tube technique and giving a carbohydrate-protein-fat meal with a single disaccharide as the source of carbohydrate, Dahlqvist and Borgstr6m (1) reported efficient absorption of lactose and maltose from human jejunum but minimal absorption of sucrose. They assumed that sucrose must have been absorbed in lower jejunum and ileum, but no ileal studies were performed. This apparent difference in the site of absorption of sucrose as compared to maltose and lactose has been quoted as fact (2, 3), and, if true, might serve to distinguish jejunal and ileal malabsorptive disease in man on the basis of comparative blood sugar curves after ingestion of the different disaccharides. Dahlqvist (4) subsequently reported data demonstrating maximal activity in human jejunum for the sucrose splitting enzyme, sucrase, but he did not relate this information to the site of hydrolysis and absorption of sucrose. In addition, recent extensive disaccharidase determinations on human intestinal mucosa by Auricchio and co-workers (5) have demonstrated activity of sucrase in jejunal and ileal mucosa to be similar, a finding that would not be expected if sucrose were hydrolyzed and absorbed principally in ileum.
This is a diffusion where the movement of water from an area of high water concentration is moved to an area of low concentration. This experiment takes place to measure the diffusion of small molecules throughout dialysis tubing. This tubing acts as a selectively permeable membrane, allowing the larger molecules to pass through, but slowly. When the two solutions on either sides of the membrane are equal and no net movement is detected, the solutions are isotonic. This means that the solutions have the same concentration of solutes.
When the concentration of sodium chloride solution is closer to the concentration of the isotonic solution, the difference in mass of the quail eggs is smaller; the smaller is the rate of osmosis. This is because in isotonic solution, the amount of water going in and out of the cell is the same thus there is not much difference
Manufacturers of soft drink commonly used benzoic acid or sodium benzoate as food preservatives. Non diet soft drinks lack aspartame, a sugar substitute used in diet soft drinks. Benzoic acid is converted into its salt sodium benzoate through neutralization with sodium hydroxide. Sodium benzoate is rather used than benzoic acid as anti-microbial agent in food and beverages because of the solubility effect. Sodium benzoate is approximately 200 times more soluble than benzoic acid.