Chapter 7: Membrane Structure and Function Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes. Name them. Explain what is meant when we say a molecule is amphipathic. 3. In the 1960s‚ the Davson-Danielli model of membrane structure was widely accepted. Describe this model and then cite two lines of evidence that were inconsistent with it. 4. Who proposed the fluid mosaic model of membrane structure
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Fred and Theresa Holtzclaw Chapter 7: Membrane Structure and Function Name_______________________Period___________ Chapter 7: Membrane Structure and Function Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes. Name them. 2. Explain what is meant when we say a molecule is amphipathic. 3. In the 1960s‚ the Davson-Danielli model of membrane structure was widely accepted. Describe
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Introduction Questions 1. The solute potential would be -2.48. If the concentration inside the cell is .15 M‚ then would diffusion out of the cell and into the solution of .1 M. This is due to water potential and the tendency for water to move from areas of high water potential to low water potential. 2. The turgor pressure must be equal to the water potential if there is no net diffusion. The cell and environment have reached equilibrium and the movement of water is equal on both sides. Getting
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“Did you know that the network of capillaries in the human body is about 50‚000 to 60‚000 miles long?” The circulatory system is formed with two major organs‚ the heart and the blood vessels‚ which includes arteries‚ veins‚ and capillaries. The capillaries are the thinnest type of blood vessel in the body but are one of the most important in the circulatory system. There are three major different types of capillaries: continuous‚ fenestrated‚ and discontinuous or sinusoid. The reason there are three
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Nov. 15‚ 2013 Ms. Lelacheur IB Biology HL The Effect of Temperature on Beet Root Membranes What is the affect of temperature on beetroot membranes? Hypothesis: It is hypothesized that as the temperature increases‚ the deeper red the beetroot water will be. At higher temperatures the proteins in the beetroot plasma membrane will denature‚ leaving holes in the membrane and allowing the red pigment in the cell sap to seep out into the water around it. Variables: Dependent-The dependent variable
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Circulatory systems Closed circulatory systems: • Blood leaves heart under pressure to arteries then arterioles then capillaries. • Capillaries come in large numbers. They exchange substances between the blood and cells. • After passing through capillaries‚ blood goes back to the heart via veins. • Valves in the veins ensure that blood only flows in one direction. Single circulatory system: • Heart pumps deoxygenated blood. • Gaseous exchange (diffusion of CO2 from blood to H2O and diffusion
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substances entered cells faster than water soluble substances; scientists in those days had also figured out that the layers of lipid were layers of fat. However‚ the downfall of the evidence provided was that scientists back in the day were not able to provide information‚ as to how a lipid layer could remain stable in contact with the water surrounding the cell in its environment‚ since lipids are repelled by water. 20th century: Due to chemical analysis of isolated membranes‚ it was discovered
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destroy the membranes inside a kiwi cell. Soap helped with that because it dissolves the membranes easily. Salt or NaCl was used to remove proteins and carbohydrates. NaCl caused the proteins and carbohydrates to precipitate. 2. Why was it necessary to “mush” the kiwi by hand? If the step was omitted‚ what effect would this omission have had on the results? The Kiwi was mashed by hand in order to break the large pieces of fruit and to increase the surface area of the cells. If this step
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‘Lichens and Air Pollution’ scenario and related chapter in the textbook and then answer the following questions before class. 1. Fungal cells are different from animals cells in that they have a. cell membranes. b. cell membranes made of phospholipids. c. cell walls made of chitin. d. cell walls made of cellulose. e. true membrane bound nuclei. 2. The symbiotic relationship between the organisms in a lichen would best be described as ____________ . a. commensalistic
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filaments‚ and microfilaments. 3. Discuss cell wall composition among various organisms. 4. Describe the functions of the extracellular matrix of animal cells. What are collagen‚ fibronectin‚ and integrins‚ and how do they interact? 5. What are plasmodesmata‚ tight junctions‚ gap junctions‚ and desmosomes‚ and where are they located? Chapter Five: Cell Membranes and Signaling 1. Discuss the composition of the cell membrane‚ and how membrane molecules may differ among organisms‚ within
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