Chapter 4: Membrane Structure and Function Fluid Mosaic Model 1. Consistency of membrane is solid enough to form a boundary‚ but flexible and permeable like a fluid. 2. Proteins scattered throughout - Embedded or on the surface - Can move around laterally 3. Phospholipid from bilayer‚ make up most of membrane 4. Glycolipids have carbohydrate chains attached. 5. Hydrophilic heads point out/into the cell 6. Hydrophobic tails point out towards each other Proteins 1. Glycoproteins: have
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BIO Chapter 2 Study Guide 1-Know the difference between an atom‚ an element and a compound. -Atom-The basic unit of a chemical element. -Element-A unique molecule that makes up all matter and cannot be broken down any further. -Compound- Two or more elements together 2-Understand and be able to apply the concept of the Atomic number and the Atomic mass of an element. -Atomic Number- The number of protons an element has. -Atomic Mass-The number of Protons + Neutrons. *the number of neutrons
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the effect that water concentration had on the mass of potato tissue‚ and to investigate the movement of osmosis through potato tissue‚ osmosis being the passage of water molecules from a weaker solution to a stronger solution‚ though a partially permeable membrane. In this case‚ the membrane of the potatoes allowed the water molecules to pass through in and out of the solution and the potato‚ depending on the concentration gradient of the two substances. The water potential of a solution is a measure
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1. Introduction 22 Diabetes mellitus is the 7th leading cause of death in US. Diabetes is broadly classified into two 23 types: type I and type II. Type I diabetes is a result of insufficient insulin production by pancreas‚ 24 whereas type II diabetes is due to the body’s inability to use the insulin that is produced‚ hence the 25 name insulin resistance is used to refer to type II diabetes. Currently‚ individuals with diabetes are 26 able to monitor their blood glucose levels using a glucometer
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Lecture 1 Cells of the Nervous System Neuron – in the form of sensory‚ motor and interneurons -> transmit info using electrical signaling Glial Cells – metabolic support‚ protection and insulation for neurons Cell body – contains nucleus‚ other organelles – ex. mitochondria for ATP Dentrites – branches which incoming fibers make connections - receiving stations for excitation or inhibition - covered with short dendritic spines that increase SA - dendrites and their spines are constantly modified
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Aerobic Respiration Breaking down glucose to release energy Products are Carbon dioxide and water Diffusion is … the movement of molecules from a region of high concentration to a low concentration until the concentration is equal. Role of a human circulatory system: Diffuse In – oxygen (O2)‚ dissolved food (glucose) and water (H2O) Diffuse Out – carbon dioxide (CO2)‚waste and water(H2O) Respiration – releasing energy in cells Breathing – getting air into and out of your body
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Transport of Solute in Solvent through Osmosis or Diffusion Due to Different Concentration Gradients Passing Through a Semi-permeable Membrane between Cell and Cells Environment Bio 101 Objective: The objective is to simulate passive transport: diffusion of solutes and osmosis of water through a semipermeable membrane (dialysis tubing). The experiment will show how molecules in solution move from areas of higher concentration to areas of lower concentration in the attempt to reach homeostasis
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a transport protein called the sodium-potassium pump. Resting potential occurs when ions are distributed unequally on the inside and outside of cells‚ and when cell membranes are selectively permeable to different ions. K+ is particularly important for the resting potential. The membrane is highly permeable to K+. In addition‚ the inside of the cell has a high concentration of K+ and the outside of the cell has a low concentration of K+. K+ will naturally diffuse from high concentration to low concentration
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from an area of high concentration to an area of low concentration. Osmosis is a type of diffusion that diffuses water through a selectively permeable membrane. There were two parts to the experiment‚ the dialysis tubing lab and the potato lab. In the first experiment‚ the dialysis tubing acted as a semi-permeable membrane. A semi-permeable membrane is a membrane that allows certain substances to pass through. In this experiment‚ several variables‚ including glucose‚ starch‚ and
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Cool summer foods to beat the heat. Maintaining a healthy diet in summer is a concern for most individuals in the modern world. The sun is shining and the mercury levels are soaring‚ you know the summer is here and there is no escape from it. It is a season where energy levels and appetite are low and a slightest activity causes the sweat to flow off your back and face. Life goes on and it is very necessary to cope with the heat to avoid the usual problems of dehydration‚ heatstroke and a feeling
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