Notes on Cellular Transport and the Food Chain

) Cell Transport a. Osmosis permeation is the diffusion of water molecules through different osmotic membranes from higher concentration regions of water molecules to lower concentration regions. Water transport is simple and selectively permeabilized cells allow water to pass until equilibrium is reached at which time water flows into the cells and flows out of the cells to maintain equilibrium. For example, putting erythrocytes in isotonic solution means that solution and cells have the same concentration, while the net movement of water is zero, but water freely comes in and out to maintain equilibrium.

Cell respiration is the process of oxidizing specific food molecules such as glucose to produce carbon dioxide and water. There are three main processes of cellular respiration: glycolysis, Krebs cycle, electron transport system. Each process plays an important role in extracting energy from food molecules and producing ATP (adenosine triphosphate) which is a high energy molecule used for energy consumption of whole cells. Cell respiration also occurs in eukaryotic and prokaryotic cells. Glycolysis is the catabolism of carbohydrates by certain enzymes involving energy release and the production of pyruvic acid (or lactic acid) acid. Unlike the other two processes of cell respiration, it occurs in the cytosol of cells. Glycolysis can occur independently of oxygen. This is called fermentation, but the program does not produce much energy, so it is not as practical as the aerobic process.

This module examines various stages of photosynthesis, photoreaction, Calvin cycle, cell respiration, glycolysis, Krebs cycle, and electron transfer system. I will outline how living things make food and use them, and why they need energy. Students document the three phases of cell respiration and explain the important parts, roles and products. This module continues to gain insight into cell division. Students are introduced with prokaryotic and eukaryotic cell division and provide a comparison between the two cells. Students identify the stages of two different cells, explain how to control the cell cycle, and define the relationship between various types of cancer cells and all cell cycle. Mitosis and meiosis are a type of cell division. In determining the role and importance of chromosomes during cell division, these two cell cycles will be identified, compared and compared.