What kind of molecules can and cannot pass easily across a lipid bilayer? Structure of a lipid bilayer A lipid bilayer is a membrane mainly composed of lipid molecules‚ usually a phospholipids (See Figure 1). Phospholipids are formed from 3 components :- (1) 2 fatty acids tails – these are hydrophobic; (2) a negatively-charged hydrophilic phosphate group; and (3) a glycerol backbone. The bilayer structure is favourable energetically because the hydrophobic fatty acid tails cluster
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(P1) Outline the functions of the main cell components Every individual possess billions of cells in their body but not only is the human body functional With cells but also contains tissues‚ organs and systems which is what the human body is made up of. The cell carries out vast numbers of chemical reactions which processes in order to make up the essence of life (Moonie N‚ Aldworth C‚ Billingham M & Talman H ‚2012). Cells are usually grouped together with other cells carrying out particular
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There is another accessory organ that also dumps its products into the duodenum around the same area; this organ is called pancreas. Pancreas is very important‚ as it secretes probably the most important digestive enzymes into the small intestine; break down. The main enzymes secreted by the pancreas for digestion are lipases for lipid/fat digestion‚ pancreatic amylase for carbohydrate digestion which continues the breakdown of the starch in the bread to a substance called maltose. As the food is
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WHAT IS A CELL? It is the smallest unit of life that is classified as a living thing‚ and is often called the building block of life. The cell is the basic structural and functional unit of all known living organisms. Some organisms are unicellular (made of only one cell) while others are multicellular (made up of several cells). The word cell comes from the Latin cellula‚ meaning‚ a small room. The term was coined by Robert Hooke in a book he published in 1665 when he compared the cork cells he
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Chapter Vocabulary Review 1. c 2. i 3. f 4. h 5. j 6. e 7. a 8. d 9. b 10. g 11. a 12. c 13. d 14. b 15. c 16. ribosome 17. rough endoplasmic reticulum 18. Golgi apparatus 19. Mitochondrion 20. chromosomes 21. diffusion 22. selective permeability 23. osmosis 24. facili-tated diffusion 25. active transport Enrichment 1. Morphogenesis
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STUDY QUESTIONS FOR TEST 3 (Major concepts)—CHAPTERS 5‚ 6‚ 7 This study guide does not include everything you need to know for the exam. It an overview of main topics that I thought were important in lecture—make sure you’ve studied your book‚ completed the questions at the end of each chapter‚ answered all of the study guide questions‚ and taken the practice exam a few times! I would recommend either writing out the answers or‚ if you’re studying with someone else‚ talk through these questions.
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Unit 2 – Disposition of Toxicants Ch 5 – Absorption‚ Distribution‚ and Excretion of Toxicants Ch 7 - Toxicokinetics Chapter 5 Absorptions‚ Distribution‚ and Excretion of Toxicants © The McGraw-Hill Companies‚ Inc‚ 2011 Factors Affecting Disposition • If fraction absorbed or rate absorbed is low‚ may never reach high enough concentration to cause toxicity • Concentrated in a tissue other than the target organ‚ thus decreasing toxicity • Biotransformation may result in formation of less toxic
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January 2011 marked the beginning of peaceful protests and movement demonstrations staged by citizens throughout Egypt. Movement actors fought for democratic advances‚ political freedoms and equality. The genuine commitment for change‚ the unity of the people and most notably the tactful manipulation of social media resulted in the disposition of the suppressive regime. Modern social media has significantly changed the traditional forms of activism and has simplified the efforts needed to provoke
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and provided valuable information to its employees anywhere in the world with the help of numerous applications. IT played an important role in the different processes of the touring cycle of the organization namely‚ creation‚ design‚ preparation‚ diffusion‚ logistics and resource management. In the creation phase‚ Cirque Memory recorded information‚ like scenography‚ choreography‚ and intentions behind the work. IT guaranteed that each aspect of the creation process was captured in the Cirque Memory
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1 Animals utilize the metabolic pathway of gluconeogenesis only when energy stores are very low. False When an ion crosses the membrane and binds to a protein to accomplish this feat‚ it is using active transport and facilitated diffusion. Adaptation is always beneficial to an individual‚ even if the environmental cause for the change is no longer present. False Many animals are capable of producing all the required fatty acids for catabolic pathways. True Vomiting is/are an example
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