hydrophilic) and tails are nonpolar (water hydrophobic). insoluble‚ 3. Describe the conformation of the phospholipid bilayer of the plasma membrane. What abundant fluid leads to his conformation? Because the phospholipids heads are polar and the tails are nonpolar‚ their orientation is directly influenced by their polar/nonpolar interaction with water. By forming a bilayer‚ the nonpolar tails point into the space between the layers and can avoid water while the polar heads point towards the outside
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Chapter 1 Section 1 Anatomy-Study of internal and external structures of the body and the physical relationships among body parts Gross Anatomy -involves the examination of relatively large structures and features usually visible with the unaided eye Microscopic Anatomy-deals with structures that cannot be seen without magnification Physiology-the study of function and considers the functions of the human body Anatomy and physiology are closely interrelated Theroretically Practically Anatomical
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viral glycoprotein. Functionally‚ viral envelopes are essential for entry into host cells. lipids are involve in attachment ‚signaling‚ replication and budding processes. During transmission even if the virus transmit from eukaryotic to eukaryotes cells the attachment of virus to the host cell may be different because the cell membranes of different host cells have different composition and types of lipids. In another view virus can change their structure and composition during transmission from
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AS Biology Unit 1 page 1 AQA AS Biology Unit 1 Contents Specification Biological Molecules Cells Human Physiology Disease Appendices Chemical bonds Carbohydrates Lipids Proteins Biochemical Tests Enzymes Eukaryotic Cells Prokaryotic Cells Cell Fractionation Microscopy The Cell Membrane Movement across Cell Membranes Exchange The Gas Exchange System Lung Diseases The Heart Coronary Heart Disease The Digestive System Cholera Lifestyle and Disease Defence
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HEATHER TOUPS A/P I T&R 10TH EDITION TEXT SELF QUIZ CHAPTER 3 Fill in the blanks in the following statements. 1. The three principal parts of the cell are the plasma membrane‚ cytoplasm and nucleus 2. Apoptosis refers to programmed cell death‚ whereas necrosis refers to cell death resulting from tissue injury. 3. The fluid portion of the cytoplasm is the cytosol 4. List three causes of cellular aging. 1)shortening and loss of protective polemeres
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Revision Questions – Nutrients Lipids 1. Lipids are made up of 3 fatty acids and a glycerol molecule‚ referred to as a triglyceride. Glycerol is an alcohol with 3 hydroxyl groups (OH). A fatty acid attaches itself to each hydroxyl group with the elimination of 3 water molecules (condensation). The fatty acids vary and determine the properties of a lipid. 2. Saturated fatty acids: * Each carbon has a full quota of hydrogen atoms. * There are no double bonds. * Solid at room
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3 Introduction: The purpose of this lab was to test for the presence of lipids. Lipids consist of fats and oils. The test performed is called the Ethanol Emulsion test. The solubility of lipids and ethanol were broken down in this test. Lipids are non-polar organic compounds‚ making them un-soluble in water but soluble in organic solvents‚ such as ethanol. Sudan IV solution tested the oil in each sample by dying the lipids red and rising the oil to the top of the solution. The hypothesis was that
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Diffusion‚ Osmosis and Active Transport Substances will move through the membrane by diffusion. This is the random spreading out of particles until they are even. For example‚ when you put your instant coffee in boiling water‚ the coffee particles spread out and fill the entire mug‚ this is diffusion. A second way that substances can move through the cell membrane is by osmosis. This is a special type of diffusion where water moves from a high to a low concentration through a ’partially permeable
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LIVING THINGS * All living things come from other living things. * Ex: One single celled organism to another * DNA is copied & passed to offspring * The signature molecule of life * Ex: embryo- cells continually divide & develop EVOLUTION * Why do some organisms seem suited for their environment * Ex: Hummingbird- long beak for nectar in certain flowers * Ex: Cheetahs- take down faster prey * Adaptation- inherited characteristic that
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carbohydrates‚ lipids‚ nucleic acids and proteins in given samples. The first experiment is to test the existence of carbohydrates in starch suspension and potato cell. If carbohydrate is present in starch suspension‚ the solution will turn into dark blue when iodine solution is added. If carbohydrate is present in potato cell‚ starch granules can be seen clearly under microscope when iodine solution is added. The second experiment is to test the existence of lipids in margarine and olive oil. If a lipid is
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